HOA.105556295.10 149
Code
Section
Condition Explanation of Amendment
appendix region is situated over a vast array of earthquake fault systems capable of producing major
earthquakes, similar to or exceeding the geologic
activities occurring during the 1994 Northridge
Earthquake. In addition, weather events occur
seasonally with high winds such as the Santa Ana
Winds. Due to the need for signs to perform well in
the County due to its climate and geology, adoption
of building standards for signs is required.
H103.1 Geologic,
Administrative,
Voluntary
appendix
Los Angeles County is a diverse region with both
densely populated urban areas and rural areas with
various signs used in the County. The greater Los
Angeles/Long Beach region is situated over a vast
array of earthquake fault systems capable of
producing major earthquakes, similar to or
exceeding the geologic activities occurring during
the 1994 Northridge Earthquake. This provision is
amended to cross-reference to applicable legal
provisions and also to ensure that signs are located
in such a way as to avoid damage to adjacent
structures and people given the potential for
earthquakes in the County.
H103.2 Geologic,
Administrative,
Voluntary
appendix
Los Angeles County is a diverse region with both
densely populated urban areas and rural areas with
various signs used in the County. The greater Los
Angeles/Long Beach region is situated over a vast
array of earthquake fault systems capable of
producing major earthquakes, similar to or
exceeding the geologic activities occurring during
the 1994 Northridge Earthquake. This provision is
amended to cross-reference to applicable legal
provisions and also to ensure that sign projections
and clearances are located in such a way as to
avoid damage to adjacent structures and people
given the potential for earthquakes in the County.
H104.1 Geologic,
Voluntary
appendix
The greater Los Angeles/Long Beach region is
situated over a vast array of earthquake fault
systems capable of producing major earthquakes,
similar to or exceeding the geologic activities
occurring during the 1994 Northridge Earthquake.
Due to the risk of geologic activities in the Southern
HOA.105556295.10 150
Code
Section
Condition Explanation of Amendment
California area, buildings and structures require a
high level of performance, which is directly
proportional to the weight of a structure. By adding
the weight of a sign to the identification placard, it
will improve the ability to provide structural
verification in the event of damage or future
modifications.
H105.1 Administrative,
Voluntary
appendix
The amendment provides a cross reference to
Chapter 24 for user convenience.
H106.1,
H106.2
Administrative,
Voluntary
appendix
This change corrects a call out from the model
electrical code to the relevant local electrical code
and clarifies that a separate electrical permit is
required for user convenience.
H110.1 Climatic,
Voluntary
appendix
Due to the potential for severe local weather
conditions with torrential rain, it is necessary to
clarify that no portions of the roof sign and
supporting members may interfere with proper roof
drainage to prevent the potential for roof collapse
due to water accumulation.
H116 Climatic,
Voluntary
appendix
Due to the potential for severe local weather with
high speed winds and hot, dry conditions, it is
necessary that the most recent test standards as
specified in Chapter 35 are adopted in lieu of the
older test standards specified in Section H116. This
ensures that the risk from fires is minimized.
J101.1 to
J101.9
Geological
Topographical
Climatic
Sections revised to include erosion and sediment
control measures to address the complex and
diverse set of soil types and geologic conditions that
exist in the greater Los Angeles County/Long Beach
region.
J101.10 Geological
Topographical
Climatic
Section revised to maintain safety and integrity of
public or private property adjacent to grading sites
due to the complex and diverse set of soil types,
climates, and geologic conditions that exist in the
greater Los Angeles County/Long Beach region.
J103.1 –
J103.2 and
Figure
J103.2
Geological
Topographical
Climatic
Sections revised to provide adequate control of
grading operations typical to the greater Los
Angeles County/Long Beach region due to the
complex and diverse set of soil types, climates, and
HOA.105556295.10 151
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Section
Condition Explanation of Amendment
geologic conditions that exist in the greater Los
Angeles County/Long Beach region.
J104.2.1 –
J104.4
Geological
Topographical
Climatic
Sections revised or added to provide adequate
control of grading operations typical to the greater
Los Angeles County/Long Beach region due to the
complex and diverse set of soil types, climates, and
geologic conditions that exist in the greater Los
Angeles County/Long Beach region.
J105.1-
J105.14
Geological
Topographical
Climatic
Sections revised or added to provide adequate
control of grading operations typical to the greater
Los Angeles County/Long Beach region due to the
complex and diverse set of soil types, climates, and
geologic conditions that exist in the greater Los
Angeles County/Long Beach region.
J106.1 Geological
Topographical
Climatic
Section revised to require more stringent cut slope
ratios to address the complex and diverse set of soil
types and geologic conditions that exist in the
greater Los Angeles County/Long Beach region.
J107.1-
J107.7
Geological
Topographical
Climatic
Sections revised to provide more stringent fill
requirements for slope stability and settlement due
to the complex and diverse set of soil types,
climates, and geologic conditions that exist in the
greater Los Angeles County/Long Beach region.
J107.8 –
J107.9
Geological
Topographical
Climatic
Sections revised to provide more stringent
inspection and testing requirements for fill slope
stability due to the complex and diverse set of soil
types, climates, and geologic conditions that exist in
the greater Los Angeles County/Long Beach region.
J108.1 –
J108.4
Geological
Topographical
Climatic
Sections revised to provide more stringent slope
setback requirements to address the complex and
diverse set of soil types, climates, and geologic
conditions that exist in the greater Los Angeles
County/Long Beach region.
J109.1 –
J109.3
Geological
Topographical
Climatic
Sections revised to provide more stringent drainage
and terracing requirements to address the complex
and diverse set of soil types, climates, and geologic
conditions that exist in the greater Los Angeles
County/Long Beach region.
J109.5 Geological
Topographical
Climatic
Subsection added to provide for adequate outlet of
drainage flows due to the diverse set of soil types,
climates, and geologic conditions that exist in the
HOA.105556295.10 152
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Section
Condition Explanation of Amendment
greater Los Angeles County/Long Beach region.
J110.1 -
J110.8.5
Geological
Topographical
Climatic
Sections revised or added to provide for State
requirements of storm water pollution prevention and
more stringent slope planting, and slope stability
requirements to control erosion due to the complex
and diverse set of soil types, climates, and geologic
conditions that exist in the greater Los Angeles
County/Long Beach region.
J111 Geological
Topographical
Climatic
Section revised to reference additional standards for
soils testing due to the complex and diverse set of
soil types, climates, and geologic conditions that
exist in the greater Los Angeles County/Long Beach
region.
Appendix Q
Q101.1,
Q102.1,
Q103.1,
Q103.4,
Q107.1
Administrative,
Voluntary
appendix
Climatic
Geologic
Topographical
Adoption of this appendix is necessary because
strict compliance with State and local standards and
laws would prevent, hinder, or delay the mitigation of
the effects of a declared shelter crisis, local
emergency or state of emergency. The
modifications to this appendix are administrative in
nature, to provide clarification of various provisions
of the language of this voluntary Appendix.
Q106.1 Climatic Los Angeles County is subject to extreme temperatures, and many of these membrane
structures will be erected and occupied during
severe weather events. It is necessary to include
this amendment to ensure the safety, health, and
comfort of the occupants is maintained during
extreme heat and cold.
Q110.1.1,
Q110.1.2
Administrative These sections are a cross reference to the State Plumbing Code requirement for user convenience
and is not adding a new building standard nor
enacting a more restrictive requirement. To the
extent findings are requested, see prefatory
language in this Section.
Q110.3 Climatic,
Voluntary
appendix
The County may utilize mobile restroom facilities
that are physically separate from the living facilities.
Due to the potential for severe local weather
conditions, with extreme temperatures or torrential
rain, the distance to the restroom facilities required
for the comfort, safety, and health of displaced
people should be reduced to 300 feet or as
HOA.105556295.10 153
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Section
Condition Explanation of Amendment
determined by the Building Official.
SECTION 93. This ordinance shall become operative on January 1, 2026. [TITLE26BUILDCODE2025CSCC]
SECTION 94. This ordinance shall be published in The Daily Commerce a newspaper printed and published in the County of Los Angeles.
Chair
ATTEST:
Edward Yen
Executive Officer -
Clerk of the Board of Supervisors
County of Los Angeles
I hereby certify that at its meeting of November 25, 2025 the foregoing ordinance was adopted by the Board of Supervisors of said County of Los Angeles by the following vote, to wit:
Ayes Noes
Supervisors Hilda L. Solis Supervisors None
Holly J. Mitchell
Lindsey P. Horvath
Janice Hahn
Kathryn Barger
Effective Date: December 25, 2025
Operative
Date: January 1, 2026
Edward Yen
Executive Officer -
Clerk of the Board of Supervisors
County of Los Angeles
APPROVED AS TO FORM:
DAWYN R. HARRISON
County Counsel
By
Nicole Davis Tinkham
Chief Deputy County Counsel
S:\Ordinances\County Counsel\2025\2025-0047
HOA.105548025.13
ANALYSIS
This ordinance repeals those provisions of Title 27 – Electrical Code – of the Los Angeles County Code that incorporate by reference portions of the 2022 California Electrical Code and replaces them with provisions incorporating by reference portions of the 2025 California Electrical Code, as published by the California Building Standards Commission. Unless deleted or modified herein, the previously enacted provisions of Title 27 continue in effect.
The provisions of this ordinance contain additions to the 2025 California Electrical Code and are administrative in nature in that they do not constitute changes or modifications to requirements contained in the building standards published in the 2025 California Electrical Code.
DAWYN R. HARRISON
County Counsel
By
MARGARET F. AMBROSE
Senior Deputy County Counsel
Public Works Division
MFA:bc
Requested: 7/28/25
Revised: 10/8/25
Attachment B Page 193 of 441
HOA.105548025.13
ORDINANCE NO. 2025-0048
An ordinance amending Title 27 – Electrical Code – of the Los Angeles County Code by adopting and incorporating by reference portions of the 202225 California Electrical Code with certain changes and modifications and making other revisions thereto.
The Board of Supervisors of the County of Los Angeles ordains as follows:
SECTION 1. Sections 89.102 through 89.114 of Article 89, Article 90, Chapters 1 through 9, and Annexes A, B, C, D, E, F, G, H, I, and J, of Title 27 of the Los Angeles County Code, which incorporate by reference and modify portions of the 201922 California Electrical Code, are hereby repealed.
SECTION 2. Section 80-1.5 is hereby amended to read as follows:
Sec. 80-1.5. California Electrical Code (CEC) Adoption by Reference.
Except as hereinafter changed or modified, Sections 89.102 through 89.114 of Article 89, Article 90, Chapters 1 through 9, and Annexes A, B, C, D, E, F, G, H, I, and J , and K, of that certain Electrical Code known and designated as the 20222025 California Electrical Code, as published by the California Building Standards Commission, are adopted and incorporated by reference into this Title 27 of the Los Angeles County Code as if fully set forth below, as Sections 89.102 through 89.114 of Article 89, Article 90, Chapters 1 through 9, and Annexes A, B, C, D, E, F, G, H, I, and J , and K, of Title 27 of the Los Angeles County Code.
HOA.105548025.13 2
A copy of the 20222025 California Electrical Code, hereinafter referred to as the CEC, shall be at all times maintained by the Chief Electrical Inspector for use and examination by the public.
SECTION 3. Section 80-10 is hereby amended to read as follows:
Sec. 80-10. Annual Review of Fees
The fees in this Code shall be reviewed annually by the Director of Public Works. Beginning on July 1, 1992, and thereafter on each succeeding July 1, the amount of each fee in this Code shall be adjusted as follows: Calculate the percentage movement between March of the previous year and March of the current year in the Consumer Price Index (CPI) for all urban consumers in the Los Angeles-Long BeachAnaheim, CA areas, as published by the United States Government Bureau of Labor Statistics, and adjust each fee by said percentage amount and round off to the nearest ten (10) cents; provided, however, no adjustment shall decrease any fee and no fee shall exceed the reasonable cost of providing services. When it is determined that the amount reasonably necessary to recover the cost of providing services is in excess of this adjustment, the Building Official may present fee proposals to the Board of Supervisors for approval.
SECTION 4. The provisions of this ordinance contain additions to the 202 5 California Electrical Code and are administrative in nature in that they do not constitute changes or modifications to requirements contained in the building standards published in the California Electrical Code.
HOA.105548025.13 3
SECTION 5. This ordinance shall become operative on January 1, 2026. [TITLE27ELECTCODE2025CSCC]
SECTION 6. This ordinance shall be published in The Daily Commerce a newspaper printed and published in the County of Los Angeles.
Chair
ATTEST:
Edward Yen
Executive Officer -
Clerk of the Board of Supervisors
County of Los Angeles
I hereby certify that at its meeting of November 25, 2025 the foregoing ordinance was adopted by the Board of Supervisors of said County of Los Angeles by the following vote, to wit:
Ayes Noes
Supervisors Hilda L. Solis Supervisors None
Holly J. Mitchell
Lindsey P. Horvath
Janice Hahn
Kathryn Barger
Effective Date: December 26, 2025
Operative
Date: January 1, 2026
Edward Yen
Executive Officer -
Clerk of the Board of Supervisors
County of Los Angeles
APPROVED AS TO FORM:
DAWYN R. HARRISON
County Counsel
By
Nicole Davis Tinkham
Chief Deputy County Counsel
S:\Ordinances\County Counsel\2025\2025-0048
HOA.105559019.8
ANALYSIS
This ordinance repeals those provisions of Title 28 – Plumbing Code – of the Los Angeles County Code, that incorporated by reference portions of the 2022 Edition of the California Plumbing Code and replaces them with provisions incorporating by reference portions of the 2025 California Plumbing Code, as published by the California Building Standards Commission, with certain changes and modifications. Unless deleted or modified herein, the previously enacted provisions of Title 28 continue in effect.
State law requires that the County's Plumbing Code impose the same requirements as are contained in the building standards published in the most recent edition of the California Plumbing Code except for changes or modifications deemed reasonably necessary by the County because of local climatic, geologic, or topographic conditions.
The changes and modifications to requirements contained in the building standards published in the 2025 California Plumbing Code that are contained in this ordinance are based upon express findings contained in the ordinance that such changes are reasonably necessary due to local climatic, geologic, or topographic conditions. These changes and modifications are substantially equivalent to changes or modifications previously filed with the California Building Standards Commission by the County of Los Angeles which were in effect as of September 30, 2025, in compliance with recent changes to section 17958 of the California Health and Safety Code.
This ordinance also makes certain modifications to the administrative provisions of Title 28.
DAWYN R. HARRISON
County Counsel
By
MARGARET AMBROSE
Principal Deputy County Counsel
MA/bc
Requested: 08/21/25
Revised: 10/10/25
Attachment B Page 198 of 441
ORDINANCE NO. 2025-0049
An ordinance amending Title 28 – Plumbing Code – of the Los Angeles County Code, to adopt and incorporate by reference portions of the 2025 California Plumbing Code, with certain changes and modifications, and to make other revisions thereto.
The Board of Supervisors of the County of Los Angeles ordains as follows:
SECTION 1. Sections 119.1.2.0 through 119.1.14.0 of Chapter 1, Chapters 2 through 17, and Appendices A, B, D, H, I, and J, of the Los Angeles County Code, which incorporate by reference and modify portions of the 2022 California Plumbing Code, are hereby repealed.
SECTION 2. Chapter 1 is hereby amended to read as follows:
CHAPTER 1
ADMINISTRATION
100 ADOPTION AND INCORPORATION BY REFERENCE.
Except as hereinafter changed or modified, Sections 1.2.0 through 1.14.0 of Chapter 1, Division I, of that certain Plumbing Code known and designated as the 2022 2025 California Plumbing Code, as published by the California Building Standards Commission, are adopted and incorporated by reference into this Title 28 of the Los Angeles County Code as if fully set forth below, and shall be known as Sections 119.1.2.0 through 119.1.14.0, respectively, of Chapter 1 of Title 28 of the Los Angeles County Code.
Except as hereinafter changed or modified, Chapters 2 through 17 and Appendices A, B, D, H, I, and J, M, and S, of that certain Plumbing Code known and
HOA.105559019.8 2
designated as the 20222025 California Plumbing Code as published by the California Building Standards Commission, are adopted and incorporated by reference into this Title 28 of the Los Angeles County Code as if fully set forth below, and shall be known as Chapters 2 through 17, and Appendices A, B, D, H, I, and J, M, and S, of Title 28 of the Los Angeles County Code.
A copy of the 20222025 California Plumbing Code shall be at all times maintained by the Chief Plumbing Inspector for use and examination by the public. . . .
SECTION 3. Section 204.0 is hereby amended to read as follows:
204.0 – B –
. . .
Building Code. The most recent edition of Title 26 of the Los Angeles County Code.
. . .
SECTION 4. Section 206.0 is hereby amended to read as follows:
206.0 – D –
. . .
Demand Hot Water Recirculation System. A hot water recirculation system requiring manual activation and equipped with a thermostat that will automatically shut off the recirculation pump when the water temperature reaches a preset level at the point of use.
. . .
HOA.105559019.8 3
SECTION 5. Section 207.0 is hereby amended to read as follows:
207.0 – E –
. . .
Electrical Code. The most recent edition of Title 27 of the Los Angeles County Code.
. . .
SECTION 6. Section 210.0 is hereby amended to read as follows:
210.0 – H –
. . .
Hot Water Recirculation System. A hot water distribution system that reduces the time needed to deliver hot water to fixtures that are distant from the water heater, boiler, or other water heating equipment. The recirculation system is comprised of hot water supply and return piping with shutoff valves, balancing valves, and circulating pumps, and a method of controlling the circulating system. . . .
SECTION 7. Section 215.0 is hereby amended to read as follows:
215.0 – M –
. . .
Mechanical Code. The most recent edition of Title 29 of the Los Angeles County Code.
. . .
HOA.105559019.8 4
SECTION 8. Section 301.2.2 is hereby amended to read as follows:
301.2.2 Standards. Standards listed or referred to in this cChapter or other chapters cover materials that will conform to the requirements of this cCode, where used in accordance with the limitations imposed in this or other chapters thereof and their listing. Where a standard covers materials of various grades, weights, quality, or configurations, the portion of the listed standard that is applicable shall be used.
Design and materials for special conditions or materials not provided for herein shall be permitted to be used only by special permission of the Authority Having Jurisdiction after the Authority Having Jurisdiction has been satisfied as to their adequacy. A list of plumbing standards that appear in specific sections of this cCode is referenced in Table 1701.1. Standards referenced in Table 1701.1 shall be applied as indicated in the applicable referenced section. A list of additional approved standards, publications, practices, and guides that are not referenced in specific sections of this cCode appear in Table 1701.2. Solar thermal energy systems and material standards are referenced in Tables U 18.1 and U 18.2 of Appendix U. AnIAPMO Installation Standards isare referenced in Appendix I for the convenience of the users of this cCode. It is not considered as a part of this cCode unless formally adopted as such by the Authority Having Jurisdiction.
HOA.105559019.8 5
SECTION 9. Section 301.3 is hereby amended to read as follows:
301.3 Alternate Materials and Methods of Construction
Equivalency and Modifications.
301.3.1 Alternate Materials and Methods of Construction.
Nothing in this cCode is intended to prevent the use of systems, methods, or devices of equivalent or superior quality, strength, fire resistance, effectiveness, durability, and safety over those prescribed by this cCode. Technical documentation shall be submitted to the Authority Having Jurisdiction to demonstrate equivalency prior to installation. The Authority Having Jurisdiction shall have the authority to approve or disapprove the system, method, or device for the intended purpose on a case-by-case basis. [HCD 1] (See Section 1.8.7).
. . .
301.3.1.1 Testing.
. . .
301.3.1.1.1 Tests.
. . .
301.3.1.2.1.2 Request by Authority Having Jurisdiction. . . .
301.3.2 Modifications. Whenever there are practical difficulties involved in carrying out the provisions of this Code, the Authority Having Jurisdiction shall have the authority to grant modifications on a case-by-case basis, upon application of the owner or the owner's authorized agent, provided the Authority Having Jurisdiction
HOA.105559019.8 6
shall first find that a special individual reason makes the strict letter of this Code impractical, that the modification is in conformity with the spirit and purpose of this C ode, and that such modification does not lessen any health, fire-protection, or other lifesafety-related requirements. The details of any action granting modifications shall be recorded and entered in the files of the Authority Having Jurisdiction. Application for approval of a modification shall be in accordance with Section 103.12.2.
SECTION 10. Section 304.1 is hereby amended to read as follows:
304.1 General. Plumbing fixtures, drains, appurtenances, and appliances, used to receive or discharge liquid wastes or sewage, shall be connected properly to the drainage system of the building or premises, in accordance with the requirements of this cCode.
Exception: [HCD 1] Limited-density owner-built rural dwellings. Where conventional plumbing, in all or in part, is installed within the structure, it shall be installed in accordance with the provisions of this cCode. Alternative materials and methods shall be permitted provided that the design complies with the intent of the c Code, and that such alternatives shall perform to protect health and safety for the intended purpose.
Dual waste piping shall be installed to permit the discharge from clothes washers, bathtubs, showers, and bathroom/restroom wash basins to be used for a graywater irrigation system. Partial connection of plumbing fixtures to the graywater system, based on accepted engineering practices and required volume of water for irrigation, shall be accepted. Graywater systems shall be designed and installed in
HOA.105559019.8 7
accordance with Chapter 15 and other parts of this Code.
Exceptions:
(1) Buildings with a graywater system, rain catchment system, or recycled water system.
(2) Sites with landscape areas not exceeding 500 square feet. (3) Projects where graywater systems are not permitted due to geological conditions.
(4) Additions and alterations that use the existing building drain.
SECTION 11. Section 601.2.3 is hereby added to read as follows:
601.2.3 Hot Water Recirculation Systems. A hot water
recirculation system shall be installed, as defined in Chapter 2, and shall not allow more than 0.6 gallons of water to be delivered to any fixture before hot water arrives. Hot water recirculation systems may include, but are not limited to, the following:
(1) Timer-initiated systems.
(2) Temperature sensor-initiated systems.
(3) Occupancy sensor-initiated systems.
(4) Smart hot water recirculation systems.
(5) Demand hot water recirculation systems.
(6) Other systems acceptable to the Authority Having Jurisdiction.
Exception: Minor additions and alterations as determined by the Authority Having Jurisdiction that use the existing water distribution pipe system and which does not contain a hot water recirculation system.
HOA.105559019.8 8
SECTION 12. Section 609.7 is hereby amended to read as follows:
609.7 Abutting Lot. Nothing contained in this cCode shall be construed to prohibit the use of all or part of an abutting or adjacent lot or lots to:
. . .
SECTION 13. Section 721.3 is hereby added to read as follows:
721.3 Public Sewer. If the public sewer does not extend to a point from which each building on a lot or parcel of land large enough to permit future subdivision can be independently served, the property owner shall construct a public sewer as required by Title 20 – Utilities – of the Los Angeles County Code, Division 2 ( Sanitary Sewer and Industrial Waste), to provide adequate sewerage for each such possible parcel.
Exception: When the Authority Having Jurisdiction finds that the character of a lot is such that no further subdivision can be reasonably anticipated, or the use is such as to preclude subdivision, or where the owner has executed a covenant stating that the lot or parcel of land, together with all improvements thereon, will be maintained as a unit and that before any subdivision is made or any portion of said lot is transferred to another owner, separate sewerage facilities as hereinbefore required in this Section will be installed, the drainage system of all buildings may be connected to a common building sewer or private sewage disposal system. The covenant shall be recorded by the owner in the office of the Registrar-Recorder as part of the conditions of ownership of said property. Such agreement shall be binding on all heirs, successors, and assigns to said property.
HOA.105559019.8 9
This exception shall apply only while the whole of such lot remains in one undivided ownership. Upon the transfer of any portion of such lot other than the whole thereof to another owner, whether such transfer is made before or after the operative date of the ordinance adding this provision, the exception shall cease and a person shall not use or maintain any building or structure except in compliance with the provisions of this Code. As used in this Section, a sale, foreclosure, or contract to sell by the terms of which the purchaser is given the right of possession shall be deemed a transfer.
SECTION 14. Section 728.0 is hereby added to read as follows:
728.0 Building Sewer Connection Requirements.
728.1 Size. That portion of the building sewer extending from the public sewer to the property line shall be not less than 4 inches (100 mm) in internal diameter.
728.2 Depth. When laid within the limits of any public
thoroughfare when the public sewer is sufficiently deep, no building sewer shall be less than 6 feet (1.8 m) below grade. Whenever practicable, the alignment and grade of each building sewer shall be straight from the public sewer to the property line. 728.3 Taps and Saddles. Whenever it becomes necessary to connect a building sewer to a public sewer at a point where no branch fitting has been installed in the public sewer, such connection shall be made as required by Title 20 – Utilities – of the Los Angeles County Code, Division 2 (Sanitary Sewer and Industrial Waste).
HOA.105559019.8 10
728.4 Connection to Trunks. Whenever required, an approvedtype unvented running trap shall be installed in each building sewer, which is connected directly to a trunk sewer by any means whatsoever. Each such running trap shall be installed in the building sewer between the house drain or drains and the connection to the trunk sewer. A T-type cleanout shall be installed in the building sewer immediately below the running trap. This cleanout need not be extended to grade. Every running trap and cleanout shall be located on the lot served by the building sewer. 728.5 Street Widening. Where a future street or road-widening area has been established by the master plan of highways or in any other manner, all work installed in such area shall conform to the requirements established in this or other related ordinances for work on public property.
728.6 Main Line Required. Building sewer construction shall conform to the requirements of main line sewers as set forth in Title 20 – Utilities – of the Los Angeles County Code, Division 2 (Sanitary Sewer and Industrial Waste), when either of the following conditions exists:
1. Where the Authority Having Jurisdiction requires such construction because of the character or quantity of the sewage or industrial waste to be discharged.
2. Where the sewer is designed to be, or proposed to be, dedicated to the County of Los Angeles at the present or any future time.
HOA.105559019.8 11
SECTION 15. Table H 101.8 of Appendix H is hereby amended to read as follows:
TABLE H 101.8
LOCATION OF SEWAGE DISPOSAL SYSTEM
MINIMUM HORIZONTAL
DISTANCE BUILDING SEWER
SEPTIC
TANK
DISPOSAL FIELD
SEEPAGE PIT
OR
CESSPOOL
Building or structures 1 2 feet 5 feet 8 feet 8 feet
Property line adjoining private
property
Clear 2 5 feet 5 feet 8 feet
Water supply wells 9 50 feet 3 50 feet 100 feet 150 feet Streams and other bodies of water 9 50 feet 50 feet 100 feet 7 150 feet 7 Trees 10 10 feet 10 feet
Seepage pits or cesspools 8 5 feet 5 feet 12 feet
Disposal field 8 5 feet 4 feet 4 5 feet
On-site domestic water service line 1 foot s 5 feet 5 feet 5 feet Distribution box 5 feet 5 feet
Pressure public water main 10 feet 6 10 feet 10 feet 10 feet For SI units: 1 foot = 304.8 mm
Notes:
1 Including porches and steps, whether covered or uncovered, breezeways, roofed porte cocheres, roofed patios, carports, covered walks, covered driveways, and similar structures or appurtenances. 2 See Section 312.3.
3 Drainage piping shall clear domestic water supply wells by not less than 50 feet (15 240 mm). This distance shall be permitted to be reduced to not less than 25 feet (7620 mm) where the drainage piping is constructed of materials approved for use within a building.
4 Plus 2 feet (610 mm) for each additional 1 foot (305 mm) of depth in excess of 1 foot (305 mm) below the bottom of the drain line. (See Section H 601.0)
5 See Section 720.0.
6 For parallel construction -- For crossings, approval by the Health Department shall be required. 7 These minimum clear horizontal distances shall also apply between disposal fields, seepage pits, and the mean high-tide line.
8 Where disposal fields, seepage pits, or both are installed in sloping ground, the minimum horizontal distance between any part of the leaching system and ground surface shall be 15 feet (4572 mm). 9 Where special hazards are involved, the distance required shall be increased as may be directed by the Authority Having Jurisdiction.
10 The septic tank and seepage pit shall not be within the protected zone of an oak tree as defined by Section
22.14.150 of Title 22 – Planning and Zoning – of the Los Angeles County Code.
HOA.105559019.8 12
SECTION 16. Table H 201.1(1) of Appendix H is hereby amended to read as follows:
TABLE H 201.1(1)
CAPACITY OF SEPTIC TANKS 1, 2, 3, 4, 5
SINGLE-FAMILY
DWELLINGS -
NUMBER OF
BEDROOMS
MULTIPLE DWELLING UNITS
OR APARTMENTS - ONE
BEDROOM EACH
OTHER USES: MAXIMUM
FIXTURE UNITS SERVED
PER TABLE 702.1
MINIMUM SEPTIC TANK
CAPACITY
(gallons)
1 or 2 — 15 750
3 — 20 1000
4 2 units 25 1200
5 or 6 3 33 1500
— 4 45 2000
— 5 55 2250
— 6 60 2500
— 7 70 2750
— 8 80 3000
— 9 90 3250
— 10 100 3500
For SI units: 1 gallon = 3.785 L
Notes:
1 Extra bedroom, 150 gallons (568 L) each.
2 Extra dwelling units over 10:250 gallons (946 L) each. 3 Extra fixture units over 100: 25 gallons (94.6 L) per fixture unit. 4 Septic tank sizes in this table include sludge storage capacity and the connection of domestic food waste disposers without further volume increase.
5 Applies to mobile homes not installed in a mobile home park.
SECTION 17. Table H 201.1(2) of Appendix H is hereby amended to read as follows:
TABLE H 201.1(2)
DESIGN CRITERIA OF FIVESIX TYPICAL SOILS
TYPE OF SOIL REQUIRED SQUARE FEET OF
LEACHING
AREA PER 100 GALLONS
MAXIMUM ABSORPTION
CAPACITY IN
GALLONS PER SQUARE FEET
OF
LEACHING AREA FOR A 24
HOUR PERIOD
Coarse sand or gravel 20 5.0
Fine sand 25 4.0
Sandy loam or sandy clay 40 2.5
Sandy clay 60 1.66
Clay with considerable sand or gravel 90 1.1
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Clay with small amount of sand or gravel 120 0.8
For SI units: 1 square foot = 0.0929 m 2 , 1 gallon = 3.785 L, 1 gallon per square foot = 40.7 L/m 2 SECTION 18. Table H 201.1(3) of Appendix H is hereby amended to read as follows:
TABLE H 201.1(3)
LEACHING AREA SIZE BASED ON SEPTIC TANK CAPACITY
REQUIRED SQUARE FEET OF LEACHING
AREA
PER 100 GALLONS SEPTIC TANK CAPACITY
(square feet per 100 gallons)
MAXIMUM SEPTIC TANK SIZE ALLOWABLE
(gallons)
20-25 7500
40 5000
60 3500
90 35003000
120 30002500
For SI units: 1 square foot per 100 gallons = 0.000245 m 2 /L, 1 gallon = 3.785 L
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SECTION 19. Table H 201.1(4) of Appendix H is hereby amended to read as follows:
TABLE H 201.1(4)
ESTIMATED WASTE SEWAGE FLOW RATES 1, 2, 3
TYPE OF OCCUPANCY GALLONS PER DAY
Airports (per employee) 15
Airports (per passenger) 5
Auto washers – check with equipment manufacturer -
Bowling alleys – with snack bar only (per lane) 75
Campground – with central comfort station (per person) 35 Campground – with flush toilets - no showers (per person) 25 Camps (day) – no meals served (per person) 15
Camps (summer and seasonal camps) – (per person) 50
Churches – sanctuary (per seat) 5
Churches – with kitchen waste (per seat) 7
Dance halls – (per person) 5
Factories – no showers (per employee) 25
Factories – with showers (per employee) 35
Factories – with cafeteria (per employee) 5
Hospitals – (per bed) 250
Hospitals – kitchen waste only (per bed) 25
Hospitals – laundry waste only (per bed) 40
Hotels – no kitchen waste (per bed) 60
Institutions – resident (per person) 75
Nursing home – (per person) 125
Rest home – (per person) 125
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Laundries – self-service with minimum 10 hours per day
(per wash cyclemachine) 30050
Laundries – commercial check with manufacturer’s
specification -
Motel (per bed space) 50
Motel – with kitchen (per bed space) 60
Offices – (per employee) 20
Parks – mobile homes (per space) 250
Parks (picnic) – with toilets only (per parking space) 20 Parks (recreational vehicles) – without water hook-up ( per space) 75
Parks (recreational vehicles) – with water and sewer
hook-up (per space) 100
Restaurants – cafeteria (per employeeseat) 5020
Restaurants – with toilet waste (per customer) 7
Restaurants – with kitchen waste (per meal) 6
Restaurants – with kitchen waste disposable service
(per meal) 2
Restaurants – with garbage disposal (per meal) 1
Restaurants – with cocktail lounge (per customer) 2
Schools staff and office (per person) 20
Schools – elementary (per student) 15
Schools – intermediate and high (per student) 20
Schools – with gym and showers (per student) 5
Schools – with cafeteria (per student) 3
Schools (boarding) – total waste (per person) 100
Service station – with toilets for 1 st bay 1000
Service station – with toilets for each additional bay 500 Stores – (per employee) 20
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Stores – with public restrooms (per 10 square feet of
floor space) 1
Swimming pools – (per person) 10
Theaters – auditoriums (per seat) 5
Theaters – with drive-in (per space) 10
For SI units: 1 square foot = 0.0929 m 2 , 1 gallon per day 3.785 L/day
Notes:
1 Sewage disposal systems sized using the estimated waste/sewage flow rates shall be calculated as follows:
(a) Waste/sewage flow, up to 1500 gallons per day (5678 L/day) Flow x 1.5 = septic tank size
(b) Waste/sewage flow, over 1500 gallons per day (5678 L/day) Flow x 0.75 + 1125 = septic tank size
(c) Secondary system shall be sized for total flow per 24 hours. 21 See Section H 201.1.
32 Because of the many variables encountered, it is not possible to set absolute values for waste/sewage flow rates for all situations. The designer should evaluate each situation and, where figures in this table need modification, they should be made with the concurrence of the Authority Having Jurisdiction.
SECTION 20. Section H 301.1 is hereby amended to read as follows:
H 301.1 General.
. . .
(3) No excavation for a leach line or leach bed shall be located within 5 feet (1 524 mm) of thegroundwater table nor to a depth where sewage is capable of contaminatingmay contaminate the underground water stratum that is useable for domestic purposes.
Exception: In areas where the records or data indicate that the groundwaters are grossly degraded, the 5 foot (1524 mm) separation requirement shall be permitted to be reduced by the Authority Having JurisdictionWhen approved by the Authority Having Jurisdiction, this distance may be reduced to 5 feet (1524 mm) from ocean w ater. The applicant shall supply evidence of groundwater depth to the satisfaction of the Authority Having Jurisdiction.
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(4) The minimum effective absorption area in any seepage pit shall be c alculated as the excavated sidewall area below the inlet exclusive of any hardpan, rock, clay, or other impervious formations. The minimum required area of porous formation shall be provided in one or more seepage pits. No excavation shall extend within 10 feet (3048 mm) of thegroundwater table nor to a depth where sewage is capable of contaminatingmay contaminate the underground water stratum that is useable for domestic purposes.
Exception: In areas where the records or data indicate that the groundwaters are grossly degraded, the 10 foot (3048 mm) separation requirement shall be permitted to be reduced by the Authority Having JurisdictionWhen approved by the Authority Having Jurisdiction, this distance may be reduced to 5 feet (1524 mm) from ocean water .
. . .
SECTION 21. Section H 401.3 is hereby amended to read as follows:
H 401.3 Absorption Rates. Where a percolation test is required, the proposed system shall have the capability to absorb a quantity of clear water in a 24- hour period equal to at least five times the liquid capacity of the proposed septic tank. n No private disposal system shall be permitted to serve a building if that test shows the absorption capacity of the soil is less than 0.83 gallons per square foot (gal/ft 2 ) (33.8 L/m 2 ) or more than 5.12 gal/ft 2 (208.6 L/m 2 ) of leaching area per 24 hours. Where the percolation test shows an absorption rate greater than 5.12 gal/ft 2 (208.6 L/m 2 ) per 24 hours, a private disposal system shall be permitted where the site does not overlie
HOA.105559019.8 18
groundwaters protected for drinking water supplies, a minimum thickness of 2 feet (610 mm) of the native soil below the entire proposed system is replaced by loamy sand, and the system design is based on percolation tests made in the loamy sand.
SECTION 22. Section H 601.5 is hereby amended to read as follows:
H 601.5 Distribution Boxes. Where two or more drain lines are installed, an approved distribution box of sufficient size to receive lateral lines shall be installed at the head of each disposal field. The inverts of outlets shall be level, and the invert of the inlet shall be not less than 1 inch (25.4 mm) above the outlets. Distribution boxes shall be designed to ensure equal flow and shall be installed on a level concrete slab in natural or compacted soil. Distribution boxes shall be coated on the inside with a bituminous coating or other approved method acceptable to the Authority Having Jurisdiction.
SECTION 23. Section H 601.8 is hereby amended to read as follows:
H 601.8 Dosing Tanks. Where the quantity of sewage exceeds the amount that is permitted to be disposed in 500 lineal feet (152.4 m) of leach line, a dosing tank shall be used. Dosing tanks shall be equipped with an automatic siphon or pump that discharges the tank once every 3 or 4 hours. The tank shall have a capacity equal to 60 to 75 percent of the interior capacity of the pipe to be dosed at one time.
Where the total length of pipe exceeds 1000 lineal feet (305 m), the dosing tank shall be provided with two siphons or pumps dosing alternately and each serving one-half of the leach fieldAutomatic syphon or dosing tanks shall be installed when required or as permitted by the Authority Having Jurisdiction.
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SECTION 24. Section H 701.2 is hereby amended to read as follows:
H 701.2 Multiple Installations. Multiple seepage pit installations shall be served through an approved distribution box or be connected in series using watertight connection laid on undisturbed or compacted soil. The outlet from the pit shall have. When connected in series, the effluent shall leave each pit through an approved vented leg fitting extending not less than 12 inches (305 mm) below the inlet fittingdownward into such existing pit and having its outlet flow line at least 6 inches below the inlet. All pipe between pits shall be laid with approved watertight joints.
SECTION 25. Section H 1001.1 is hereby amended to read as follows:
H 1001.1 Inspection. Inspection requirements shall comply with the following:
(1) Applicable provisions of Section 105.0104.0 of this cCode and this a Appendix shall be required. Plans shall be required in accordance with Section 103.3102.1 of this cCode.
. . .
(5) Disposal fields and seepage pits shall not be installed in uncompacted fill.
SECTION 26. Section H 1101.6 is hereby added to read as follows:
H 1101.6 Excavation. No excavation for an abandoned sewer or sewage facility shall be left unattended at any time, unless the permittee shall have first provided a suitable and adequate barricade to assure public safety.
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SECTION 27. Appendix M is hereby amended to be Appendix T to read as follows:
APPENDIX MT
SWIMMING POOLS
MT 1.0 Swimming pool waste water shall be disposed of as hereinafter set forth in this Section and the type of disposal proposed shall be approved by the Authority Having Jurisdiction prior to the commencement of any work. A means of disposal of the total contents of the pool (periodic emptying) without surface runoff shall be established to the satisfaction of the Authority Having Jurisdiction.
MT 2.0 The following are legal methods of swimming pool waste water disposal.
(1) To a public sewer.
(2) On the property if the property is large enough to ensure that runoff will not encroach on abutting property.
(3) To a tank truck.
(4) In the case where none of the above can be accomplished, alternate methods of disposal acceptable to the State Regional Water Quality Control Board (SRWQCB) may be used. Prior to discharge, the swimming pool water must be tested by the owner to insureensure that it is within all water quality standards established by the SRWQCB. Contact Department of Public Works, Environmental Programs Division for information.
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MT 3.0 No direct connection shall be made between any storm drain, sewer, drainage system, drywell or subsoil irrigation line and any line connected to a swimming pool.
MT 4.0 Waste water from any filter, scum gutter overflow, pool emptying line or similar apparatus or appurtenance when discharging to any part of a drainage system, shall be provided with a three (3) inch (76.2 mm) trap.
MT 5.0 Except as provided in Section MT 6.0, the discharge outlet terminal from any pool or filter shall be protected from backflow by an air gap at least six (6) inches (152.4 mm) above the flood rim of the receptor.
MT 6.0 No scum gutter drain, overflow drain, backwash discharge drain, or pool emptying line shall enter any receptor below the rim unless the pool piping at its deepest point, the bottom of the filters, and the bottom of the scum gutter drain trough or overflow inlets are at least six (6) inches (152.4 mm) above the overflow rim of the receptor.
MT 7.0 A positive point of potable water supply to each swimming pool shall be established and shall be installed as required by Chapter 6 of this Code.
MT 8.0 Plans for other than private swimming pools shall be approved by the Health Officer before any water supply or waste discharge permit is issued.
Note: The forgoing applies only to outdoor swimming, bathing, or wading pools. Plans and specifications for all indoor installations shall be submitted to the Authority Having Jurisdiction for approval prior to the commencement of any work, and all piping,
HOA.105559019.8 22
equipment and construction shall be equal to the types prescribed in the Installation Requirements of this Code for indoor work.
MT 9.0 All new swimming pools constructed or installed in Fire Zone 4 or in a Very High Fire Hazard Severity Zone and having a capacity of 5000 gallons or more shall have a minimum four (4) inch diameter drain and discharge line connected to a draft hydrant, the type, location, and installation of which shall be approved by the chief of the fire department. Materials used for the discharge line shall be as approved in this Code for potable water systems except that brass, cast iron, galvanized wrought iron, and copper shall not be used. If PVC is used, it shall be a minimum of Schedule
40. Exception: Swimming pools constructed or installed with the bottom of the pool more than 15 feet below the proposed draft hydrant connection elevation, measured vertically, need not be provided with a draft hydrant system.
To identify that pool draft system, an appropriate sign (as designated by the fire department) including the location of the swimming pool shall be posted on the pool safety fence and/or at the draft hydrant location.
MT 10.0 For one- and two-family dwellings, any new permanently installed outdoor in-ground swimming pool or spa shall be equipped with an automatic cover. For irregular-shaped pools where it is infeasible to cover 100 percent of the pool due to its irregular shape, the largest possible area of the pool (minimum 80 percent) shall be covered. For additions and alterations, non-automatic covers shall be accepted.
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SECTION 28. Appendix S is hereby amended to be Appendix U and to read as follows:
APPENDIX SU
SOLAR THERMAL ENERGY SYSTEMS
SU 1.0 General.
In addition to the requirements of this Appendix, the provisions of this Code and Title 29 – Mechanical Code – of the Los Angeles County Code shall apply to the erection, installation, alteration, relocation, replacement, addition to, use, maintenance and repair of solar thermal energy systems, including, but not limited to, equipment and appliances intended to utilize solar thermal energy for water heating and swimming pool heating.
SU 2.0 Definitions.
For the purpose of this Appendix, certain terms, words, phrases, and their derivatives shall be construed as set forth in this Section. Whenever terms are not defined, their ordinary dictionary meaning shall apply.
Absorber. That part of the solar collector that receives the incident radiation energy.
Absorptance. The collecting of heat, measured as percent of total radiation available.
Ambient Temperature. Surrounding temperature.
Anchors. See Supports.
HOA.105559019.8 24
Antifreeze. An additive used in water-based heat transfer fluids to decrease the freezing temperature of the fluids and protect hydronic systems from freezing.
Appliance. A device that utilizes an energy source to produce light, heat, power, refrigeration, or air conditioning. This definition also includes electric storage or tankless water heaters.
Aperture. The maximum projected area of a solar collector through which the unconcentrated solar radiant energy is admitted.
Area, Absorber. The total projected heat transfer area from which the absorbed solar irradiation heats the transfer media.
Area, Aperture. The maximum projected area of a solar collector through which the unconcentrated solar radiant energy is admitted.
Automatic. That which provides a function without the necessity of human intervention.
Auxiliary Heating System. Equipment using non-solar energy sources to supplement or back up the output provided by a solar thermal energy system.
Closed Loop System. A system where the fluid is enclosed in a piping system that is not vented to the atmosphere.
Collector. See Solar Collector.
Collector Cover (Glazing). The material covering the aperture to provide thermal and environmental protection.
Collector System. That section of the solar collector system that includes the collector and piping or ducts from the collector to the storage system.
HOA.105559019.8 25
Combustible Liquid. A liquid having a flash point at or above 100°F (38°C).
Combustible liquids shall be divided into the following classifications:
(1) Class II liquids having a flash point above 100°F (38°C) and below 140°F (60°C).
(2) Class IIIA liquids having a flash point at or above 140°F (60°C) and below 200°F (93°C).
(3) Class IIIB liquids having a flash point at or above 200°F (93°C).
The classifications of combustible liquids do not include compressed gases or cryogenic fluids.
Concentrating Solar Collector. A solar collector that uses reflectors, lenses, or other optical elements to concentrate the radiant energy passing through the aperture onto an absorber of which the surface area is smaller than the aperture area.
Corrosion. The gradual degradation and destruction of metals and other natural and synthetic materials typically resulting from and/or electrochemical reactions with their environment including, but not limited to, weathering, dissolution, and direct photochemical attack.
Cover, Collector (Glazing). The material covering the aperture to provide thermal and environmental protection.
Design Pressure. The maximum allowable pressure for which a specific part of a system is designed.
HOA.105559019.8 26
Design Temperature. The maximum allowable continuous or intermittent temperature for which a specific part of a solar energy system is designed to operate safely and reliably.
Distribution System. That section of the solar energy system from the storage system to the point of use.
Drainback System. A closed loop system which allows gravity draining of the heat transfer fluid into lower portions of the solar loop under prescribed circumstances.
Draindown (Drainback). An active solar energy system in which the fluid in the solar collector is drained from the solar energy system under prescribed circumstances.
Energy Collector Fluid. That fluid used to transfer energy from the collector to the storage system or point of use.
Energy Storage Fluid (or Media). That fluid (or media) used in the storage container for storing collected energy.
Energy Transfer Fluid. That fluid used within a closed system either from the collector to the storage system or from the storage system to the point of use.
Essentially Nontoxic Transfer Fluid. Fluid generally recognized as safe by the Food and Drug Administration (FDA) as food grade.
External Auxiliary Heating. Auxiliary heating device located outside the storage. The heat is transferred to the storage by direct or indirect charging via a charge loop.
Fail-Safe Freeze Protection. A freeze-protection method that does not rely on the activation or continued operation of any mechanical or electrical component.
HOA.105559019.8 27
Flammable Liquid. Any liquid that has a flash point below 100°F (38°C), and has a vapor pressure not exceeding 40 psi (276 kPa) at 100°F (38°C). Flammable liquids shall be known as Class I liquids and shall be divided into the following classifications:
(1) Class IA liquids having a flash point below 73°F (23°C) and a boiling point below 100°F (38°C).
(2) Class IB liquids having a flash point below 73°F (23°C) and a boiling point at or above 100°F (38°C).
(3) Class IC liquids having a flash point at or above 73°F (23°C) and below 100°F (38°C).
Flash Point. The minimum temperature corrected to a pressure of 14.7 psi (101 kPa) at which a test flame causes the vapors of a portion of the sample to ignite under the conditions specified by the test procedures and apparatus. The flash point of a liquid shall be determined in accordance with ASTM D 56, ASTM D 93, or ASTM D 3278.
Freeze Protection. Any method for protecting solar thermal systems from damage due to freezing conditions where installed in locations where freezing ambient temperature conditions exist.
Freeze Protection, Fail-Safe. A freeze-protection method that does not rely on the activation or continued operation of any mechanical or electrical component.
Heat Exchanger. A device that transfers heat from one medium to another.
HOA.105559019.8 28
Heat Transfer Medium. The medium used to transfer energy from the solar collectors to the thermal storage or load.
Immersed Heat Exchanger. Heat exchanger, which is completely surrounded with the fluid in the storage tank.
Instantaneous Efficiency. The amount of energy removed by the transfer fluid per gross collector area, during a specified time period, divided by the total solar radiation incident on the collector per unit area during the same test period, under steady state or quasi-steady state.
Integral Collector Storage. A solar thermal heating system that uses a solar collector that has all or most of its heat transfer medium inside the collector.
Langelier Saturation Index. A formula used to measure water balance or mineral saturation control of pool, spa, or hot tub water. Total alkalinity, calcium hardness, pH, water temperature, and total dissolved solids are measured, given a factor, and calculated to determine whether water has a tendency to be corrosive or scale forming.
Open Loop System. A system where the fluid is enclosed in a piping system that is vented to the atmosphere.
Out-Gassing. As applied to thermal energy, the thermal process by which materials expel gas.
HOA.105559019.8 29
Passive Solar Systems. As used in these requirements, are solar energy systems that utilize elements of a building, without augmentation by mechanical components such as blowers or pumps, to provide for the collections, storage, or distribution of solar energy for heating, cooling, or both.
Rock Storage. A bin, basement, or other container filled with rock to act as an energy reservoir for a solar energy system.
Solar Collector. A device used to absorb energy from the sun.
Solar Energy System. A configuration of equipment and components to collect, convey, store, and convert the sun's energy for a purpose.
Solar Energy System Components. Any appliance, assembly, device, equipment, or piping used in the conversion of solar energy into thermal energy for service water heating, pool water heating, space heating and cooling, and electrical service.
Solar Thermal Energy System. See Solar Thermal System.
Solar Thermal System. A complete assembly of subsystems which convert solar energy into thermal energy and utilize this energy for service water heating, pool water heating, space heating and cooling purposes.
Storage Temperature. Temperature of the storage medium.
Supports. Supports, hangers, and anchors are devices for properly supporting and securing pipe, fixtures, and equipment.
HOA.105559019.8 30
Thermal Energy. The amount of sensible heat energy stored within a material or fluid. The product of the mass, specific thermal capacity, and temperature increase/decrease of the material or fluid. Also known as sensible heat energy.
Thermal Storage. A tank or vessel used in a solar thermal, hydronic, or geothermal system, in which thermal energy is stored.
Thermosiphon. The natural circulation of fluids due to temperature differential.
Total Alkalinity. The sum of all alkaline minerals in the water that is primarily in bicarbonate form, but also as sodium, calcium, magnesium, potassium carbonates, and hydroxides. It is a measure of the water's ability to resist changes in pH.
SU 3.0 Permits Required.
It shall be unlawful for a person, firm, or corporation to construct, install, alter, repair, replace, or remodel a solar thermal energy system regulated by this Code or cause the same to be done without first obtaining a separate permit for each separate system or interconnected set of systems as specified in Section 103.0 of this Code.
SU 4.0 Plans and Specifications.
Plans, engineering calculations, diagrams, and other data shall be submitted in one or more sets with each application for a permit. Where required by the Authority Having Jurisdiction, the plans, computations, diagrams, specifications, and other data shall be prepared by, and the solar thermal energy system designed by, an engineer, an architect, or both, who shall be licensed by the state to practice as such.
HOA.105559019.8 31
Exception: The submission of plans, calculations, or other data may be waived where the Authority Having Jurisdiction determines that the nature of the work applied for is such that reviewing of plans is not necessary to obtain compliance within the Code.
SU 5.0 Installation.
SU 5.1 Listed Appliances. Except as otherwise provided in this Code, the installation of appliances regulated by this Code shall be in accordance with the conditions of the listing. The appliance installer shall leave the manufacturer's installation and operating instructions attached to the appliance. Clearances of listed appliances from combustible materials shall be as specified in the listing or on the rating plate.
SU 5.2 Standards. Standards listed or referred to in this Appendix or other provisions of this Code cover materials that will conform to the requirements of this Code, where used in accordance with the limitations prescribed in this Code and their listing. Where a standard covers materials of various grades, weights, quality, or configurations, the portion of the listed standard that is applicable shall be used. Design and materials for special conditions or materials not provided for herein may be permitted as authorized by Section 301.3. A list of standards that appear in specific sections of this Appendix are referenced in Table SU 18.1. A list of additional standards, publications, practices, and guides that are not referenced in specific sections of this Appendix appear in Table SU 18.2. The documents indicated in Table SU 18.2 shall be permitted in accordance with Section 301.3.
HOA.105559019.8 32
SU 6.0 Inspection and Testing.
SU 6.1 General. Solar thermal energy systems for which a permit is required by this Code shall be inspected by the Authority Having Jurisdiction. No solar thermal energy system or portion thereof shall be covered, concealed, or put into use until it first has been tested, inspected, and approved as prescribed in this Code.
Neither the Authority Having Jurisdiction nor the jurisdiction shall be liable for expense entailed in the removal or replacement of material required to permit inspection. Solar thermal energy systems regulated by this Code shall not be connected to the water, the energy fuel supply, or the sewer system until authorized by the Authority Having Jurisdiction. Installation of a solar thermal energy system shall comply with other parts of this Code, including Section 104.0.
SU 6.2 Required Inspection. New solar thermal energy system work and such portions of existing systems as affected by new work, or changes, shall be inspected by the Authority Having Jurisdiction to ensure compliance with the requirements of this Code and to ensure that the installation and construction of the solar thermal energy system is in accordance with approved plans. The Authority Having Jurisdiction shall make the following inspections and other such inspections as necessary. The permittee or the permittee's authorized agent shall be responsible for the scheduling of such inspections as follows:
(1) Underground inspection shall be made after trenches or ditches are excavated and bedded, piping installed, and before backfill is put in place.
HOA.105559019.8 33
(2) Rough-in inspection shall be made prior to the installation of wall or ceiling membranes.
(3) Final inspection shall be made upon completion of the installation.
SU 6.3 Testing. Solar thermal energy systems shall be tested and approved as required by this Code or the Authority Having Jurisdiction.
SU 6.3.1 Piping. The piping of the solar thermal system shall be tested with water, air, a heat transfer medium, or as recommended by the manufacturer 's instructions, except that plastic pipe shall not be tested with air. The Authority Having Jurisdiction shall be permitted to require the removal of plugs, etc., to ascertain where the pressure has reached all parts of the system.
SU 6.3.2 System Requirements. Prior to the installation of insulation and startup, a solar thermal system, including piping, collectors, heat exchangers, and other related equipment, shall be tested and proved airtight.
SU 6.3.2.1 Direct (Open Loop) Systems. Direct (open loop) systems shall be tested under a water pressure not less than one and one-half times the maximum design operating pressure or 150 pounds force per square inch (psi) (1034 kPa), whichever is more. Systems shall withstand the test without leaking for a period of not less than 15 minutes.
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SU 6.3.2.2 Indirect (Closed Loop) Systems. Indirect (closed loop) systems shall be hydrostatically tested at one and one-half times the maximum designed operating pressure in accordance with the manufacturer's installation instructions. Systems shall withstand the test without leaking for a period of not less than 15 minutes.
SU 6.3.3 Test Pressure for Storage Tanks. The test pressure for storage tanks that are subject to water pressure from utility mains (with or without a pressure reducing valve) shall be two times the working pressure but not less than 300 psi (2068 kPa).
SU 6.3.3.1 Pressure Type. Pressure-type storage tanks exceeding 15 psi (103 kPa) shall be tested in accordance with ASME BPVC Section VIII. Pressuretype storage tanks not exceeding 15 psi (103 kPa) shall be hydrostatically tested at one and one-half times the maximum design operating pressure.
SU 6.3.3.2 Atmospheric-Type. Atmospheric-type thermal storage tanks shall be tested by filling with water for a period of 24 hours prior to inspection and shall withstand the test without leaking. No thermal storage tank or portion thereof shall be covered or concealed prior to approval.
SU 6.3.4 Connection to Service Utilities. No person shall make connections from a source of energy or fuel to a solar thermal energy system or equipment regulated by this Code and for which a permit is required until approved by the Authority Having Jurisdiction. No person shall make connection from a water-supply line nor shall they connect to a sewer system regulated by this Code and for which a
HOA.105559019.8 35
permit is required until approved by the Authority Having Jurisdiction. The Authority Having Jurisdiction shall be permitted to authorize temporary connection of the solar thermal energy system equipment to the source of energy or fuel for the purpose of testing the equipment.
SU 7.0 Water Heating Systems.
SU 7.1 Solar Water Heating System. Solar water heating systems shall be in accordance with IAPMO S1001.1 or ICC 900/SRCC 300. Where solar collectors are capable of being isolated from the remainder of the system, a suitable pressure relief valve shall be installed in the isolatable section.
SU 7.2 Auxiliary Heating System. An auxiliary heating system shall be installed in conjunction with the solar thermal system and shall be adequate to provide service in the absence of solar thermal energy input. An auxiliary heating system that utilizes electricity as the energy source shall be in accordance with Section SU 15.0. Auxiliary heating systems that utilize solid fuel or fuel gas as the energy source shall be in accordance with Title 29 – Mechanical Code – of the Los Angeles County Code.
SU 8.0 Abandonment.
SU 8.1 General. An abandoned solar thermal energy system or part thereof shall be disconnected from remaining systems, drained, plugged, and capped in a manner satisfactory to the Authority Having Jurisdiction.
HOA.105559019.8 36
SU 8.2 Storage Tank. An underground water storage tank that has been abandoned or discontinued otherwise from use in a solar thermal energy system shall be completely drained and filled with earth, sand, gravel, concrete, or other approved material or removed in a manner satisfactory to the Authority Having Jurisdiction.
SU 9.0 Tanks.
SU 9.1 Storage Tanks.
SU 9.1.1 Plans. Plans for tanks shall be submitted to the Authority Having Jurisdiction for approval, unless listed by an approved listing agency. Such plans shall show dimensions, reinforcing, structural calculations, and such other pertinent data as required by the Authority Having Jurisdiction.
SU 9.1.2 Atmospheric Tanks. Atmospheric storage tanks shall be vented to the atmosphere and installed in accordance with the manufacturer's installation instructions.
SU 9.1.2.1 Overflow. Gravity tanks shall be installed with an overflow opening of not less than 2 inches in diameter. The openings shall be above ground and installed with a screened return bend.
SU 9.1.2.2 Makeup Water. Makeup water from a potable water system to an atmospheric tank shall be protected by an air gap.
HOA.105559019.8 37
SU 9.1.2.3 Draining. An overflow shall be provided for an atmospheric tank. The overflow shall be provided with a means of drainage in accordance with Section 303.0 of this Code. The overflow for an atmospheric tank containing nonpotable water shall be emptied into an approved container.
SU 9.1.3 Prefabricated Storage Tanks. Prefabricated tanks shall be listed by an approved agency and labeled.
SU 9.1.4 Pressure Vessels. A pressure-type storage tank exceeding an operating pressure of 15 psi (103kPa) shall be constructed in accordance with ASME BPVC Section VIII.1. Fiber-reinforced plastic storage tanks shall be constructed in accordance with ASME BPVC Section X.
SU 9.1.5 Devices. Devices attached to or within a tank shall be accessible for repair and replacement.
SU 9.1.5.1 Safety Devices. Pressure-type thermal storage tanks shall be installed with a listed combination temperature and pressure relief valve in accordance with Section SU 14.3.1. The temperature setting shall not exceed 210°F (99°C) and the pressure setting shall not exceed 150 percent of the maximum designed operating pressure of the system, or 150 percent of the established normal operating pressure of the piping materials, or the labeled maximum operating pressure of a pressure-type storage tank, whichever is less. The pressure and temperature setting shall not exceed the pressure and temperature rating of the tank or as recommended by the tank manufacturer.
HOA.105559019.8 38
Storage tanks and bottom fed tanks connected to a water heater shall be designed to withstand vacuum induced pressure, or shall be provided with a vacuum relief in accordance with Section SU 14.3.4. The vacuum relief valve shall be installed at the top of the tank and shall have an operating pressure not to exceed 200 psi (1379 kPa) and a temperature rating not to exceed 250°F (121°C). The size of such vacuum relief valves shall have a minimum rated capacity for the equipment served. This Section shall not apply to pressurized captive air diaphragm or bladder tanks.
SU 9.1.6 Separate Storage Tanks. For installations with separate storage tanks, a pressure relief valve and temperature relief valve or combination thereof shall be installed on both the main storage tank and auxiliary tank.
SU 9.1.6.1 Isolation Valves. Storage tanks shall be provided with isolation valves for servicing.
SU 9.1.7 Underground Storage Tanks. Tanks shall be permitted to be buried underground where designed and constructed for such installation.
SU 9.1.8 Tank Covers. Tank covers shall be structurally designed to withstand anticipated loads and pressures in accordance with the manufacturer’s instructions.
SU 9.1.9 Drainage Pan. Where water heater, boiler, or other thermal storage tank is installed in an attic, attic-ceiling assembly, floor-ceiling assembly, or floor subfloor assembly where damage could result from a leaking water heater, boiler or tank, a watertight pan of corrosion-resistant materials shall be installed beneath the water
HOA.105559019.8 39
heater, boiler, or tank, with not less than 3/4 of an inch (20 mm) diameter drain to an approved location. Such pan shall be not less than 1 ½ inches (38mm) in depth.
SU 9.1.10 Storage Tank Construction and Materials.
SU 9.1.10.1 Construction. Storage tanks shall be constructed of durable materials not subject to excessive corrosion or decay and shall be watertight.
Each such tank shall be structurally designed to withstand anticipated loads and pressures and shall be installed level and on a solid bed.
SU 9.1.10.2 Concrete. The walls and floor of each poured-in-place, concrete tank shall be monolithic. The exterior walls shall be double-formed so as to provide exposure of the exterior walls during the required water test. The compressive strength of a concrete tank wall, top and covers, or floor shall be not less than 2500 pounds-force per square inch (psi) (lb/in 2 ) (1.7236 E+04, kPa). Where required by the Authority Having Jurisdiction, the concrete shall be sulfate resistant (Type V Portland Cement).
SU 9.1.10.3 Metal Tanks. Metal tanks shall be welded, riveted and caulked, brazed, bolted, or constructed using a combination of these methods.
SU 9.1.10.4 Filler Metal. Filler metal used in brazing shall be nonferrous metal or an alloy having a melting point above 1000°F (538°C) and below that of the metal joined.
HOA.105559019.8 40
SU 9.1.10.5 Insulation. Tank insulation shall have a thermal resistance not less than as shown in Table SU 9.1.10.5. The temperature difference shall be calculated as the difference between the design operating temperature of the tank and the temperature of the surrounding air, or soil where the tank is installed underground.
Where such data is not available, a temperature difference of 50°F (28°C) shall be used.
TABLE SU 9.1.10.5
TEMPERATURE DIFFERENCE(°F)
THERMAL RESISTANCE
(R)[°F•h•ft2 /(Btu)]
50 6
100 12
150 18
200 24
250 30
For SI units: °C = °F(0.5555556), 1 degree Fahrenheit hour square foot per British thermal unit = [0.176 (m2•K)/W], 1 British thermal unit inch per degree Fahrenheit hour square feet = 0.1441 W/(m•K)* Based on thermal conductivity (k) of 0.20 [(Btu•inch)/(°F•h•ft2 )] (0.03 W/(m•K)
SU 9.2 Expansion Tanks.
SU 9.2.1 Where Required. An expansion tank shall be installed in a solar thermal energy system as a means for controlling increased pressure caused by thermal expansion. Expansion tanks shall be of the closed type and securely fastened to the structure. Tanks shall be rated for the pressure of the system. Supports shall be capable of carrying twice the weight of the tank filled with water without placing strain on the connecting piping.
HOA.105559019.8 41
Solar thermal energy systems incorporating hot water tanks or fluid relief columns shall be installed to prevent freezing under normal operating conditions.
Exception: An engineered fluid expansion storage system shall be permitted to incorporate fluid storage in vessels open to the atmosphere. Storage tanks and components for such systems shall be constructed of non-corrosive materials, or the system fluid shall be treated to inhibit corrosion. [See Figure U 9.2.1(2) for an example of an engineered fluid expansion storage system which incorporates fluid storage in a vessel open to the atmosphere.]
FIGURE U 9.2.1(1)1,2
EXAMPLE OF A CLOSED-LOOP SYSTEM WITH
DIAPHRAGM TYPE EXPANSION TANK
(SIMPLIFIED SCHEMATIC)
Notes:
1 This schematic does not include all system components, and configurations may vary based on design. 2 A makeup supply may be provided using any type of fluid source. The makeup supply is not considered part of the closed-loop.
HOA.105559019.8 42
FIGURE U 9.2.1(2)1,2
EXAMPLE OF AN ENGINEERED FLUID EXPANSION
STORAGE SYSTEM (ATMOSPHERIC)
(SIMPLIFIED SCHEMATIC)
Notes:
1 This schematic does not include all system components, and configurations may vary based on design. 2 The atmospheric expansion tank accommodates thermal expansion and, or contraction of the system fluid.
SU 9.2.2 Closed-Type Solar Thermal Energy Systems. Closedtype systems shall have an airtight tank or other approved air cushion that will be consistent with the volume and capacity of the system, and shall be designed for a hydrostatic test pressure of two and one-half times the allowable working pressure of the system. Expansion tanks for systems designed to operate at more than 30 poundsforce per square inch (psi) (207 kPa) shall comply with ASME BPVC Section VIII.1.
Provisions shall be made for draining the tank without emptying the system.
HOA.105559019.8 43
SU 9.2.3 Minimum Capacity of Closed-Type Expansion Tanks.
The minimum capacity for a gravity-type hot water system expansion tank shall be in accordance with Table SU 9.2.3(1). The minimum capacity for a forced-type hot water system expansion tank shall be in accordance with Table SU 9.2.3(2) or Equation SU 9.2.3(1). The minimum capacity for diaphragm tanks shall be in accordance with Table SU 9.2.3(2) or Equation SU 9.2.3(2).
Equation SU 9.2.3(1)
Vt(forced type) =
Equation SU 9.2.3(2)
Vt(diaphram) =
Where:
C 1 = 0.00041
C 2 = 0.0466
Vt = Minimum volume of expansion tank, gallons (L)
Vs = Volume of system, not including expansion tank, gallons (L) t = Average operating temperature, °F (°C).
Pa = Atmospheric pressure, pounds per square inch (kPa) Pf = Fill pressure, pounds per square inch (kPa)
Po = Maximum operating pressure, pounds per square inch (kPa) For SI units: C 1 = 0.000738, C 2 = 0.03348, 1 gallon = 3.785 L, °C = (°F-32)/1.8, 1 pound per square inch = 6.8947 kPa
HOA.105559019.8 44
TABLE SU 9.2.3(1)
EXPANSION TANK CAPACITIES FOR GRAVITY
HOT WATER SYSTEMS 1
INSTALLED EQUIVALENT DIRECT RADIATION 2
(square feet)
TANK CAPACITY
(gallons)
Up to 350 18
Up to 450 21
Up to 650 24
Up to 900 30
Up to 1100 35
Up to 1400 40
Up to 1600 2 to 30
Up to 1800 2 to 30
Up to 2000 2 to 35
Up to 2400 2 to 40
For SI units: 1 gallon = 3.785 L, 1 square foot = 0.0929 m 2 Notes:
1 Based on a two-pipe system with an average operating water temperature of 170°F (77°C), using cast-iron column radiation with a heat emission rate of 150 British thermal units per square foot hour [Btu/(ft 2 •h)] (473 W/m2 ) equivalent direct radiation. 2 For systems exceeding 2400 square feet (222.9 m 2 ) of installed equivalent direct water radiation, the required capacity of the cushion tank shall be increased on the basis of 1 gallon (4 L) tank capacity per 33 square feet (3.1 m 2 ) of additional equivalent direct radiation.
TABLE SU 9.2.3(2)
EXPANSION TANK CAPACITIES FOR FORCED
WATER SYSTEMS 1
SYSTEM VOLUME 2
(gallons)
TANK CAPACITY DIAPHRAGM
TYPE
(gallons)
TANK CAPACITY
(gallons)
100 9 15
200 17 30
300 25 45
400 33 60
500 42 75
1000 83 150
2000 165 300
For SI units: 1 gallon = 3.785 L
Notes:
1 Based on an average operating water temperature of 195°F (91°C), a fill pressure of 12 psig (83 kPa), and an operating pressure of not more than 30 psig (207 kPa). 2 Includes volume of water in boiler, radiation, and piping, not including expansion tank.
HOA.105559019.8 45
SU 10.0 Solar Collectors.
SU 10.1 General. Frames and braces exposed to the weather shall be constructed of materials for exterior locations, and protected from corrosion or deterioration, in accordance with the requirements of the Authority Having Jurisdiction.
SU 10.1.1 Construction. Collectors shall be designed and constructed to prevent interior condensation, out-gassing, or other processes that will reduce the transmission properties of the glazing, reduce the efficiency of the insulation, or otherwise adversely affect the performance of the collector.
SU 10.1.2 Flat Plate Collector Glass. Flat plate collector glass shall be tempered.
SU 10.1.3 Plastic. Plastic used in collector and other parts of the solar thermal energy system construction shall be installed in accordance with the manufacturer's installation instructions.
SU 10.1.4 Listing. Collectors that are manufactured as a complete component shall be listed or labeled by an approved listing agency in accordance with ICC 901/SRCC 100, UL 1279, or equivalent standard.
SU 10.1.5 Air Collectors. Materials exposed within air collectors shall be noncombustible or shall have a flame spread index not to exceed 25 and a smoke developed index not to exceed 50 where tested as a composite product in accordance with ASTM E 84 or UL 723.
HOA.105559019.8 46
SU 10.1.5.1 Testing. Materials used within an air collector shall not smoke, smolder, glow, or flame where tested in accordance with ASTM C 411 at temperatures exposed to in service. In no case shall the test temperature be less than 250°F (121°C).
SU 10.2 Solar Collector Installation.
SU 10.2.1 General. Solar collectors shall be ballasted or anchored to roof structures or other surfaces in accordance with the manufacturer's installation instructions and Title 26 – Building Code – of Los Angeles County. Collectors shall be mounted to minimize the accumulation of debris. Connecting pipes shall not be used to provide support for a solar collector.
SU 10.2.2 Roof Installations. Anchors secured to and through a roofing material shall be made to maintain the water integrity of the roof covering. Roof drainage shall not be impaired by the installation of collectors. Solar collectors that are not an integral part of the roofing system shall be installed to preserve the integrity of the roof surface.
U 10.2.3 Protection Against Decay. Wood shall not be used in the construction of collector or system mounting.
SU 10.2.34 Above Or On The Roof. Collectors located above or on roofs, and functioning as building components, shall not reduce the required fireresistance and fire-retardance classification of the roof covering materials.
HOA.105559019.8 47
Exceptions:
(1) Collectors located on one- and two-family dwellings. (2) Collectors located on buildings not exceeding three stories in height or 9,000 square feet (836.13 m 2 ) total floor area, or both, provided:
(a) The collectors are noncombustible.
(b) Collectors with plastic covers have noncombustible sides and bottoms, and the total area covered and the collector shall not exceed the following:
(i) Plastic CC1 – 33 1/3 percent of the roof area;
(ii) Plastic CC2 – 25 percent of the roof area; and
(c) Collectors with plastic film covers having a thickness of not more than 0.010 of an inch (0.25 mm) shall have noncombustible sides and bottoms, and the total area covered by the collector shall not exceed 33 1/3 percent of the roof area.
SU 10.2.45 Ground Installations. Solar collectors shall terminate above finished grade to avoid obstruction by vegetation, snow, or ice. The supporting columns shall extend below the frost line.
SU 10.2.56 Wall Mounted. Solar collectors mounted on a wall shall be secured and fastened in accordance with Section 313.0 of this Code.
SU 10.2.67 Access. Access shall be provided to collectors and components in an approved manner. A work space adjacent to collectors for maintenance and repair shall be provided in accordance with requirements of the Authority Having Jurisdiction.
HOA.105559019.8 48
SU 10.2.78 Stagnation Condition. The collector and other parts of the solar thermal assembly shall be capable of withstanding stagnant conditions in a ccordance with the manufacturer's instructions where high solar flux and no flow occurs.
SU 10.2.89 Waterproofing. Joints between structural supports and buildings or dwellings, including penetrations made by bolts or other means of fastening, shall be made watertight with approved material.
SU 10.2.910 Fasteners. Mountings and fasteners shall be made of corrosion-resistant materials. Carbon steel mountings and fasteners shall be classified as noncorrosive in accordance with ASME SA194.
SU 10.2.1011 Combustible Materials. Solar thermal energy systems constructed with combustible materials shall not be located on or adjacent to construction required to be of noncombustible materials or in Very High Fire Hazard Severity Zone as defined in Title 32 - Fire Code – of the Los Angeles County Code, unless approved by the Authority Having Jurisdiction.
SU 10.2.1112 Orientation. Collectors shall be located and oriented in accordance with the manufacturer's installation instructions.
SU 10.3 Fire Safety Requirements.
SU 10.3.1 Building Components. Collectors that function as building components shall be in compliance with Title 26 – Building Code – of the Los Angeles County Code and Title 32 – Fire Code – of the Los Angeles County Code.
HOA.105559019.8 49
SU 11.0 Hazardous Heat Transfer Medium for Solar Thermal Energy Systems. Heat-transfer mediums that are hazardous shall not be used in solar thermal energy systems, except where approved by the Authority Having Jurisdiction.
SU 11.1 Flash Points. The flash point of a heat-transfer medium shall be 50°F (10°C) or more above the design maximum temperature.
SU 11.2 Discharge. The collector, collector manifold, and manifold relief valve shall not discharge directly or indirectly into the building or toward an open flame or other source of ignition.
SU 12.0 Heat Exchangers.
SU 12.1 General. Solar thermal energy systems utilizing heat exchangers shall protect the potable water system from being contaminated by the heat transfer medium. Systems that incorporate a single-wall heat exchanger to separate potable water from the heat transfer fluid shall meet all of the following requirements:
(1) The heat transfer medium is either potable water or contains fluids recognized as safe by the Food and Drug Administration (FDA) as food grade. (2) A tag or label shall be securely affixed to the heat source with the word " CAUTION" and the following statements:
(a) The heat transfer medium shall be water or other nontoxic fluid recognized as safe by the FDA.
(b) The maximum operating pressure of the heat exchanger shall not exceed the maximum operating pressure of the potable water supply.
HOA.105559019.8 50
(3) The word "CAUTION" and the statements listed above shall have an uppercase height of not less than 0.120 of an inch (3.048 mm). The vertical spacing between lines of type shall be not less than 0.046 of an inch (1.168 mm). Lowercase letters shall be not less than compatible with the uppercase letter size specification.
Systems that do not comply with the requirements for a single-wall heat exchanger shall install a double-wall heat exchanger. Double-wall heat exchangers shall separate the potable water from the heat transfer medium by providing a space between the two walls vented to the atmosphere.
SU 13.0 Valves.
SU 13.1 General. Valves shall be rated for the operating temperature and pressures of the solar thermal energy system and shall be compatible with the type of heat transfer medium and piping materials. Valves shall be installed in accordance with this Section.
SU 13.2 Heat Exchanger. Shutoff valves and isolation valves shall be installed on the supply and return side of the heat exchanger.
Exception: Where a heat exchanger is an integral part of a boiler or is a part of a manufactured boiler and heat exchanger packaged unit, and is capable of being isolated from the hydronic system by supply and return valves.
SU 13.3 Pressure Vessels. Isolation valves shall be installed on connections to pressure vessels.
SU 13.4 Pressure Reducing Valves. Isolation valves shall be installed on both sides of a pressure reducing valve.
HOA.105559019.8 51
SU 13.5 Equipment, Components, and Appliances. Serviceable equipment, components, and appliances within the system shall have isolation valves installed upstream and downstream of such devices.
SU 13.6 Expansion Tanks. Isolation valves shall be installed at connections to non-diaphragm-type expansions tanks.
SU 13.7 Flow Balancing Valves. Where flow balancing valves are installed, such valves shall be capable of increasing or decreasing the amount of flow by means of adjustment.
SU 13.7.1 Location. Balancing valves shall be installed at the outlet of each group of collectors.
SU 13.8 Control Valves. An approved three-way valve shall be permitted to be installed for manual control systems. An approved electric control valve shall be permitted to be installed for automatic control systems. The installation and operation of automatic control valves shall comply with the manufacturer's instructions.
SU 13.8.1 Mixing or Temperature Control Valves. Where mixing or temperature control valves are installed, such valves shall be capable of obtaining the design water temperature and design flow requirements.
SU 13.9 Thermosiphoning. An approved type check valve shall be installed on liquid heat transfer piping to control thermosiphoning of heated liquids.
SU 13.10 Air Removal Device or Air Vents. Isolation valves shall be installed where air removal devices or automatic air vents are utilized to permit cleaning, inspection, or repair without shutting the system down.
HOA.105559019.8 52
SU 13.11 Closed Loop Systems. Closed loop systems, where hose bibbs or similar valves are used to charge or drain the system, shall be of loose key type; have valve outlets capped; or have handles removed where the system is operational.
SU 13.12 Fullway Valves. A fullway valve shall be installed in the following locations:
(1) On the water supply to a solar thermal energy system. (2) On the water supply pipe to a gravity or pressurized water tank. (3) On the water supply pipe to a water heater.
SU 13.13 Accessible. Required fullway or shutoff valves shall be accessible.
SU 14.0 Piping and Cross-connection Control For Solar Thermal Energy Systems.
SU 14.1 Cross Connection Control. No piping installation, or part thereof, shall be made in such a manner that it will be possible for used, unclean, polluted, or contaminated water, mixtures, or substances to enter a portion of the potable water system from a pipe, tank, receptor, or any other equipment by reason of backsiphonage, suction, or any other cause, either during normal use and operation thereof, or where such pipe, tank, receptor, or equipment is subject to pressure exceeding the operating pressure in the potable water system.
HOA.105559019.8 53
SU 14.2 Materials.
SU 14.2.1 Piping Materials. Piping, tubing, and fittings materials shall comply with Table SU 14.2. Joining methods shall be in accordance with Section 605.0.
Materials in contact with the heat transfer medium shall be approved for such use.
Galvanized steel shall not be used for solar thermal piping systems containing antifreeze. Black steel shall not be used in systems with entrapped or entrained air.
Unions between dissimilar metals shall comply with Sections 310.6 and 605.15. The material used shall be capable of withstanding the maximum temperature and pressure of the system.
SU 14.2.1.1 Plastic. Plastic used in the construction of a solar thermal system shall be installed in accordance with the manufacturer's installation instructions.
SU 14.2.1.2 Combustible Materials. Combustible materials shall not be located on or adjacent to construction required to be of noncombustible materials or in fire areas, unless approved by the Authority Having Jurisdiction.
SU 14.2.1.3 Adhesives. Adhesives used in a solar collector shall not vaporize at the design temperature and shall be identified and approved for the intended use.
SU 14.2.1.4 Potable Water. Materials in contact with potable water shall comply with NSF 61/ANSI/CAN 61. Piping in solar thermal systems designed to convey potable water shall be flushed and disinfected in accordance with this Code.
SU 14.2.1.5 Racks. Dissimilar metals used for racking shall be isolated to prevent galvanic corrosion. Paint shall not be used as a method of isolation.
HOA.105559019.8 54
SU 14.2.1.6 Fasteners. Mountings and fasteners shall be made of corrosion-resistant materials. Carbon steel mountings and fasteners shall be classified as noncorrosive in accordance with ASME SA194.
SU 14.2.2 Storage Tank Connectors. Flexible metallic storage tank connectors or reinforced flexible storage tank connectors connecting a storage tank to the piping system shall be in accordance with the applicable standards referenced in Table SU 18.1. Copper or stainless steel flexible connectors shall not exceed 24 inches (610 mm). PEX, PE-AL-PE, or PE-RT tubing shall not be installed within the first 18 inches (457 mm) of piping connected to a storage tank.
SU 14.2.2.1 Flexible Connectors. Listed flexible connectors shall be installed in readily accessible locations, unless otherwise indicated in the listing.
SU 14.3 Safety Devices.
SU 14.3.1 Pressure Relief Valves. Solar thermal energy system components containing pressurized fluids shall be protected against pressures exceeding design limitations with a pressure relief valve. Each section of the system in which excessive pressures are capable of developing shall have a relief device located so that a section cannot be isolated from a relief device. Pressure and temperature relief valves shall be installed in accordance with the terms of their listing and the manufacturer's installation instructions.
HOA.105559019.8 55
TABLE SU 14.2
MATERIALS FOR SOLAR THERMAL SYSTEM, PIPING, TUBING, AND FITTINGS
MATERIAL STANDARDS
PIPING/TUBING FITTINGS
Copper/Copper Alloy
ASTM B42, ASTM B43, ASTM B75,
ASTM B88, ASTM B135, ASTM
B251*, ASTM B302, ASTM B447
ASME B16.15, ASME
B16.18, ASME B16.22, ASME
B16.23, ASME B16.24, ASME
B16.26, ASME B16.29,
ASME B16.51, ASSE 1061, ASTM
F3226, IAPMO PS 117
Steel
ASTM A53, ASTM A106, ASTM
A254
ASME B16.5, ASME
B16.9, ASME B16.11,
ASTM A420, ASTM
F3226, IAPMO PS 117
Gray Iron –– ASTM A126
Malleable Iron –– ASME B16.3
Chlorinated Polyvinyl Chloride
(CPVC)
ASTM D2846, ASTM F441, ASTM
F442, CSA B137.6
ASSE 1061, ASTM D2846, ASTM
F437, ASTM F438, ASTM F439,
ASTM F1970, CSA B137.6
Polyethylene (PE) ASTM D1693, ASTM D2513,
ASTM D2683, ASTM D2737, ASTM
D3035, ASTM D3350, ASTM F714,
ASTM F2165, AWWA C901, CSA
B137.1, NSF 358-1
ASTM D2609, ASTM D2683,
ASTM D3261, ASTM F1055, ASTM
F2165, CSA B137.1, NSF 358-1
Cross-Linked Polyethylene (PEX)
ASTM F876, ASTM F2165, ASTM
F3253, CSA B137.5, NSF
358-3
ASSE 1061, ASTM F877, ASTM
F1055, ASTM F1807, ASTM F1960,
ASTM F2080, ASTM F2098, ASTM
F2159, ASTM F2165, ASTM F2735,
ASTM F3253, ASTM F3347, ASTM
F3348, CSA B137.5, NSF 358-3
Polypropylene (PP) ASTM F2165, ASTM F2389, CSA
B137.11, NSF 358-2
ASTM F2165, ASTM F2389, CSA
B137.11, NSF 358-2
Polyvinyl Chloride (PVC) ASTM D1785, ASTM D2241, CSA
B137.3
ASTM D2464, ASTM
D2466, ASTM D2467,
ASTM F1970, CSA
B137.2, CSA B137.3
Raised Temperature Polyethylene
(PE-RT)
ASTM F2165, ASTM F2623, ASTM
F2769, CSA B137.18
ASSE 1061, ASTM D3261, ASTM
F1055, ASTM F1807, ASTM
F2159, ASTM F2165, ASTM
F2735, ASTM F2769, CSA
B137.18
Cross-Linked
Polyethylene/Aluminum/ CrossLinked Polyethylene (PEX-AL-PEX) ASTM F1281, ASTM F2165, CSA
B137.10
ASTM F1281, ASTM F1974, ASTM
F2165, ASTM F2434, CSA
B137.10
Polyethylene/Aluminum/Polyethylen
e (PE- AL-PE)
ASTM F1282, ASTM F2165, CSA
B137.9
ASTM F1282, ASTM F1974, ASTM
F2165, CSA B137.9
Stainless Steel ASTM A269, ASTM A312, ASTM
A554, ASTM A778
ASTM F1476, ASTM
F1548, ASTM F3226,
IAPMO PS 117
Chlorinated Polyvinyl
Chloride/Aluminum/ Chlorinated
Polyvinyl Chloride
(CPVC/AL/CPVC)
ASTM F2855 ASTM D2846
Note:
* Only Type K, L, or M shall be permitted to be installed.
HOA.105559019.8 56
MATERIAL STANDARDS
PIPING/TUBING FITTINGS
Copper and Copper Alloys ASTM B42, ASTM B43, ASTM B75,
ASTM B88, ASTM B135, ASTM B251
2 , ASTM B302, ASTM B447
ASME B16.15, ASME B16.18, ASME
B16.22, ASME B16.23, ASME
B16.24, ASME B16.26, ASME
B16.29,
ASME B16.51, ASSE 1061, ASTM
F3226, IAPMO/ANSI/CAN Z1117
Ductile Iron AWWA C115/A21.15, AWWA
C151/A21.51
AWWA C110/A21.10 1 , AWWA
C153/A21.53
Steel ASTM A53, ASTM A106, ASTM A254 ASME B16.5, ASME B16.9, ASME B16.11, ASTM A420, ASTM F3226,
IAPMO IGC 353, IAPMO/ANSI/CAN
Z1117
Gray Iron –– ASTM A126
Malleable Iron –– ASME B16.3
Chlorinated Polyvinyl Chloride (CPVC) ASTM D2846, ASTM F441, ASTM F442, CSA B137.6
ASSE 1061, ASTM D2846, ASTM
F437, ASTM F438, ASTM F439,
ASTM F1970, CSA B137.6
Polyethylene (PE) ASTM D1693,
ASTM D2683, ASTM D2737, ASTM
D3035, ASTM D3350,
ASTM F714, ASTM F2165, AWWA
C901, CSA B137.1, NSF/ANSI 358-1
ASTM D2609, ASTM D2683, ASTM
D3261, ASTM F1055, ASTM F2165,
CSA B137.1, NSF/ANSI 358-1
Cross-Linked Polyethylene (PEX) ASTM F876, ASTM F2165, ASTM F3253, CSA B137.5, NSF/ANSI 358-
3 ASSE 1061, ASTM F877, ASTM
F1055, ASTM F1807, ASTM F1960,
ASTM F2080, ASTM F2098, ASTM
F2159, ASTM F2165, ASTM F2735,
ASTM F3253, ASTM F3347, ASTM
F3348, CSA B137.5,
NSF/ANSI 358-3
Polypropylene (PP) ASTM F2165, ASTM F2389, CSA
B137.11, NSF/ANSI 358-2
ASTM F2165, ASTM F2389, CSA
B137.11, NSF/ANSI 358-2
Polyvinyl Chloride (PVC) ASTM D1785, ASTM D2241, CSA
B137.3
ASTM D2464, ASTM D2466, ASTM
D2467, ASTM F1970, CSA B137.2,
CSA B137.3
Polyethylene of Raised Temperature
(PE-RT)
ASTM F2165, ASTM F2623, ASTM
F2769, CSA B137.18
ASSE 1061, ASTM D3261, ASTM
F1055, ASTM F1807, ASTM F2159,
ASTM F2165, ASTM F2735, ASTM
F2769, ASTM F3347, ASTM F3348,
CSA B137.18
Cross-Linked Polyethylene/Aluminum/
Cross-Linked Polyethylene (PEX-ALPEX)
ASTM F1281, ASTM F2165, CSA
B137.10
ASTM F1281, ASTM F1974, ASTM
F2165, ASTM F2434, CSA B137.10
Polyethylene/Aluminum/Polyethylene
(PE-AL-PE)
ASTM F1282, ASTM F2165, CSA
B137.9
ASTM F1282, ASTM F1974, ASTM
F2165, CSA B137.9
Stainless Steel ASTM A269, ASTM A312, ASTM
A554, ASTM A778
ASTM F1476, ASTM F1548, ASTM
F3226, IAPMO IGC 353,
IAPMO/ANSI/CAN Z1117
Chlorinated Polyvinyl
Chloride/Aluminum/ Chlorinated
Polyvinyl Chloride (CPVC/AL/CPVC)
ASTM F2855 ASTM D2846
Notes:
1 Ductile and gray iron.
2 Only Type K, L, or M shall be permitted to be installed.
HOA.105559019.8 57
SU 14.3.2 Pressurized Vessels. Pressurized vessels shall be provided with overpressure protection by means of a listed pressure relief valve installed in accordance with the manufacturer's installation instructions.
SU 14.3.3 Discharge Piping. The discharge piping serving a temperature relief valve, pressure relief valve, or combination of both shall have no valves, obstructions, or means of isolation and comply with the following:
(1) The discharge pipe shall equal the size of the valve outlet and shall discharge full size to the flood level of the area receiving the discharge and pointing down.
(2) Materials shall be rated at not less than the operating temperature of the system and approved for such use or shall comply with ASME A112.4.1. (3) The discharge pipe shall discharge independently by gravity through an air gap into the drainage system or outside of the building with the end of the pipe not exceeding 2 feet (610 mm) and not less than 6 inches (152 mm) above the ground and pointing downwards.
(4) The discharge pipe shall discharge in such a manner that does not cause personal injury or structural damage.
(5) No part of such discharge pipe shall be trapped or subject to freezing. (6) The terminal end of the pipe shall not be threaded. (7) Discharge from a relief valve into a water heater pan is prohibited. (8) The discharge termination point shall be readily observable.
HOA.105559019.8 58
SU 14.3.4 Vacuum Relief Valves. System components that are subjected to a vacuum while in operation or during shutdown shall be protected with vacuum relief valves. Where the piping configuration, equipment location, and valve outlets are located below the storage tank elevation, the system shall be equipped with a vacuum relief valve at the highest point.
SU 14.3.5 Temperature Regulation. Where a system is capable of providing potable water at temperatures that exceed 140°F (60°C), a thermostatic mixing valve that is in accordance with ASSE 1017 shall be provided to limit the water supplied to the potable hot water distribution system to a temperature of 140°F (60°C) or less.
SU 14.4 Protection of System Components.
SU 14.4.1 Materials. System components in contact with heat-transfer mediums shall be approved for such use. Components installed outdoors shall be resistant to ultraviolet radiation.
SU 14.4.2 Corrosion. Solar thermal energy systems and components subject to corrosion shall be protected in an approved manner. Metal parts exposed to atmospheric conditions shall be of corrosion-resistant material.
SU 14.4.3 Mechanical Damage. Portions of a solar thermal energy system installed where subjected to mechanical damage shall be guarded against such damage by being installed behind approved barriers or, where located within a garage, be elevated or located out of the normal path of a vehicle, defined as a line perpendicular to the garage vehicle opening to the back wall extending 36 inches (914
HOA.105559019.8 59
mm) to either side along the back wall and to a height of 48 inches (1219 mm).
Protective barriers for energy storage systems (ESS) shall be designed to resist, deflect, or visually deter vehicle impact in accordance with Section U 14.4.3.1 through Section U 14.4.3.3. (See Figure U 14.4.3).
Exception: Where the clear height of the vehicle garage opening is equal to or less than 90 inches (2286 mm), ESS installed at least 36 inches (914 mm) above the finished floor shall not be subject to vehicle impact protection requirements.
U 14.4.3.1 Bollards. Where installed, construction of bollards shall be in accordance with one of the following:
(1) 48 inches (1219 mm) in length by 3 inches (76 mm) in diameter, Schedule 80 steel pipe embedded in a concrete pier 12 inches (305 mm) deep and 6 inches (152 mm) in diameter, with 36 inches (914 mm) of pipe exposed, filled with concrete, and spaced at intervals not exceeding 60 inches (1524 mm). Each bollard shall be located not less than 6 inches (152 mm) from an ESS.
(2) 36 inches (914 mm) in height by 3 inches (76 mm) in diameter, Schedule 80 steel pipe fully welded to an 8 inch (203 mm) by 8 inch (203 mm) by 1⁄4 of an inch (6.4 mm) thick steel plate and bolted to a concrete floor by means of four ½ inch (12.7 mm) concrete anchors with not less than 3 inches (76 mm) of embedment. Spacing shall not exceed 60 inches (1524 mm), and each bollard shall be located not less than 6 inches (152 mm) from the ESS.
HOA.105559019.8 60
(3) Pre-manufactured steel pipe bollards shall be filled with concrete and anchored in accordance with the manufacturer's installation instructions. Spacing between bollards shall not exceed 60 inches (1524 mm). Each bollard shall be located not less than 6 inches (152 mm) from the ESS.
U 14.4.3.2 Wheel Barriers. Where installed, construction of wheel barriers shall be in accordance with one of the following:
(1) 6 inches (152 mm) in height by 6 inches (152 mm) in width, wheel stop made of concrete or polymer, anchored to the concrete floor at intervals of not less than 36 inches (914 mm) and located not less than 54 inches (1372 mm) from the ESS. Not less than two ½ inch (12.7 mm) diameter concrete anchors with 3 inches (76 mm) of embedment per wheel stop shall be used. Spacing between wheel stops shall not exceed 36 inches (914 mm).
(2) Pre-manufactured wheel stops shall be anchored in accordance with the manufacturer's installation instructions.
U 14.4.3.3 Other Approved Methods. Protective barriers installed 24 inches (610 mm) above grade and designed to resist a 2000 pound-force (8896 N) impact in the direction of vehicle travel shall be permitted.
HOA.105559019.8 61
Figure U 14.3.3
PROTECTIVE BARRIERS FOR ESS
HOA.105559019.8 62
SU 14.4.4 Freeze Protection. Unless designed for such conditions, solar thermal energy systems and components that contain liquid as the heat transfer medium shall be protected from freezing, by means of fail-safe freeze protection in accordance with this Section, where the ambient temperature may be less than 46°F (8°C).
SU 14.4.4.1 Antifreeze. Antifreeze shall be used in accordance with the solar thermal system manufacturer’s instructions.
SU 14.4.4.2 Drainback. Drainback systems shall drain by gravity and shall be permitted to be installed in applications where the ambient temperature may not be less than -60°F (-51°C).
SU 14.4.4.3 Integral Collector Storage. Integral collector storage systems shall be permitted to be installed in applications where the ambient temperature may not be less than 23°F (-5°C) and the duration of below-freezing episodes exceeding 18 hours. Exposed piping in a solar thermal energy system shall be protected with insulation having a thermal resistance of not less than R-5.0.
SU 14.4.4.4 Indirect Thermosiphon. Indirect thermosiphon systems shall be permitted to be installed in applications where the ambient temperature may not be less than 23°F (-5°C). Exposed piping in a solar thermal energy system shall be protected with insulation having a thermal resistance of not less than R-5.
SU 14.4.4.5 Air Heating Systems. Air solar heating systems shall be permitted to be used in accordance with the manufacturer's instructions.
HOA.105559019.8 63
SU 14.4.4.6 Labeling. A label indicating the method of freeze protection for the system shall be attached to the system in a visible location.
SU 14.4.4.7 Piping. Fittings, pipe slope, and collector shall be designed to allow for manual gravity draining and air filling of solar thermal energy system components and piping. Pipe slope for gravity draining shall be not less than 1⁄4 inch per foot (20.8 mm/m) of horizontal length. Collector header pipes or absorber plate riser tubes internal to the collector shall be sloped in accordance with the manufacturer's instructions. Where a means to drain the system is provided, a drain valve shall be installed.
SU 14.4.5 Water Hammer Protection. The flow of the hydronic piping system shall be designed to prevent water hammer.
U 14.4.6 Heat Transfer Fluid Quality. Heat transfer fluids used in closed-loop hydronic systems shall be in accordance with IAPMO/ANSI H1001.1.
U 14.4.6.1 Ethylene Glycol. Ethylene glycol shall not be used in oneand two-unit residential systems. In existing systems, where ethylene glycol is used, there shall be no direct or permanent potable water connections. Where a temporary potable water connection is required, a backflow preventer shall be installed.
SU 14.4.67 Heat Transfer Fluid. Solar thermal piping shall be identified with an orange background with black uppercase lettering, with the words "CAUTION:
HEAT TRANSFER FLUID, DO NOT DRINK." Each solar thermal energy system shall be identified to designate the medium being conveyed. The minimum size of the letters and length of the color field shall comply with Table SU 14.4.67.
HOA.105559019.8 64
Each outlet on the solar thermal piping system shall be posted with black uppercase lettering as follows:
"CAUTION: HEAT TRANSFER FLUID, DO NOT DRINK."
TABLE SU 14.4.67
MINIMUM LENGTH OF COLOR FIELD AND SIZE OF LETTERS
OUTSIDE DIAMETER OF PIPE OR
COVERING
(inches)
MINIMUM LENGTH OF COLOR
FIELD
(inches)
MINIMUM SIZE OF LETTERS
(inches)
½ to 1¼ 8 ½
1½ to 2 8 ¾
2½ to 6 12 1¼
8 to 10 24 2½
Over 10 32 3½
For SI units: 1 inch = 25.4 mm
U 14.4.8 Identification of Chemical Additives. In systems where chemical additives are used, documentation including the following information shall be readily accessible and maintained onsite:
(1) Concentrations
(2) Maintenance requirements
(3) Maintenance log
(4) Safety data sheet (SDS)
SU 14.4.79 Insulation.
SU 14.4.79.1 General. The temperature of surfaces within reach of building occupants shall not exceed 140°F (60°C) unless the surfaces are protected by insulation. Where sleeves are installed, the insulation shall continue full size through them. Coverings and insulation used for piping shall be of material approved for the operating temperature of the system and the installation environment. Where installed
HOA.105559019.8 65
in a plenum, the insulation, jackets and lap-seal adhesives, including pipe coverings and linings, shall have a flame spread index not to exceed 25 and a smoke-developed index not to exceed 50 where tested in accordance with ASTM E84 or UL 723.
SU 14.4.79.2 Heat Loss. Insulation shall be installed on interconnecting solar and hot water piping. The final 5 feet (1524 mm) of the cold water supply line, or the entire length where less than 5 feet (1524 mm), shall be insulated. The insulation thickness shall be in accordance with Table S 14.4.7.3(1) or Table S 14.4.7.3(2), or the insulation installedshall have an R-value of not less than R-2.6 degree Fahrenheit hour square foot per British thermal unit (°F•h•ft2 /Btu) (R-0.46 m 2 •K/W). Piping, storage tanks, and circulating air ductwork shall be insulated. Ductwork and piping shall be permitted to not be insulated where exposed in conditioned spaces, and the heat loss from such ducts or piping does not otherwise contribute to the heating or cooling load within such space.
Exception: Low temperature, aboveground piping installed for swimming pools, spas, and hot tubs in accordance with the manufacturer's installation instructions unless such piping is located within a building.
SU 14.4.79.3 Piping. Pipes and fittings, other than unions, flanges, or valves, shall be insulated. Insulation material shall be approved for continuous operating temperatures of not less than 220°F (104°C). [See Table S 14.4.7.3(1) and Table S 14.4.7.3(2)].
HOA.105559019.8 66
TABLE S 14.4.7.3(1)
MINIMUM PIPE INSULATION
I
NSULATION
I.D.
(i
nches)
INSULATION O.D.
(inches)
INSULATION NOMINAL THICKNESS
(inches)*
0 .86
1 .07
1 .33
1 .68
1 .92
2 .41
2 .91
3 .53
4 .03
4 .53
HOA.105559019.8 67
6 .70
For SI units: 1 inch = 25 mm
* Thickness values are applicable for calcium silicate, cellular foam plastics, cellular glass, mineral fiber, and perlite preformed insulation materials
TABLE S 14.4.7.3(2)
STANDARD TUBING INSULATION THICKNESS
T
UBE SIZE
(
inches)
T
UBE O.D.
(
inches)
INS
ULATION I.D.
(inc
hes)
INSULATION O.D.
(inches)
INSULATION NOMINAL THICKNESS
(inches)*
2 2
.5
3 .5
4 4
.5
5 3
⁄8
0 .500
0.5 2
4 .50
5 .56
- - - -
1 ⁄2
0 .625
0.6 4
4 .50
5 .56
- - - -
3 ⁄4
0 .875
0.8 9
5 .00
6 .62
8 .62
9 .62
1 0.75
1 1.75
1 1
.125
1.1 4
5 .00
6 .62
8 .62
9 .62
1 0.75
1 1.75
1 1⁄4
1 .375
1.3 9
5 .56
6 .62
8 .62
9 .62
1 0.75
1 1.75
1 1⁄2
1 .625
1.6 4
5 .56
6 .62
8 ,62
9 .62
1 0.75
1 1.75
2 2
.125
2.1 6
6 .62
7 .62
9 .62
1 0.75
1 1.75
1 2.75
2 1⁄2
2 .625
2.6 6
6 .62
7 .62
9 .62
1 0.75
1 1.75
1 2.75
HOA.105559019.8 68
3 3
.125
3.1 6
7 .62
8 .62
1 0.75
1 1.75
1 2.75
1 4.00
3 1⁄2
3 .625
3.6 6
7 .62
8 .62
1 0.75
1 1.75
1 2.75
1 4.00
4 4
.125
4. 16
8 .62
9 .62
1 0.75
1 1.75
1 2.75
1 4.00
1 5.00
5 5
.125
5. 16
9 .62
1 0.75
1 1.75
1 2.75
1 4.00
1 5.00
1 6.00
6 6
.125
6. 20
1 0.75
1 1.75
1 2.75
1 4.00
1 5.00
1 6.00
1 7.00
For SI units: 1 inch = 25 mm
* Thickness values are applicable for calcium silicate, cellular foam plastics, cellular glass, mineral fiber, and perlite preformed insulation materials.
SU 14.4.79.4 Fittings. Fittings shall be insulated with mitered sections, molded fittings, insulating cement, or flexible insulation.
SU 14.4.79.5 Installation. Insulation shall be finished with a jacket or facing with the laps sealed with adhesives or staples so as to secure the insulation on the pipe. Insulation jacket seams shall be on the underside of the piping and shall overlap in accordance with the manufacturer's installation instructions. Joints and seams shall be sealed with a sealant that is approved for both the material and environmental conditions. In lieu of jackets, molded insulation shall be permitted to be secured with 16 gauge galvanized wire ties not exceeding 9 inches (229 mm) on center.
HOA.105559019.8 69
SU 14.4.79.5.1 Exterior Applications. Insulation for exterior applications shall be finished with an approved jacket, coating, or facing with the surfaces and laps sealed. Jacketing, coating, facing, and tape used for exterior applications shall be designed for such use. Where flexible insulation is used, it shall be wrapped and sealed against water penetration. Insulation used for exterior applications shall be resistant to extreme temperatures, UV exposure, and moisture.
SU 15.0 Specific Requirements.
SU 15.1 Electrical.
SU 15.1.1 Wiring. Electrical connections, wiring, and devices shall be installed in accordance with NFPA 70. Electrical equipment, appliances, and devices installed in areas that contain flammable vapors or dusts shall be of a type approved for such environment.
SU 15.1.2 Controls. Required electrical, mechanical, safety, and operating controls shall be listed or labeled by a listing agency. Electrical controls shall be of such design and construction as to be suitable for installation in the environment in which they are located.
SU 15.2 Flow Directions. Flow directions shall be permanently affixed on the solar thermal energy system.
SU 15.3 Attic Installations. An attic space in which solar energy system components are installed shall comply with Section 508.4 of this Code.
HOA.105559019.8 70
SU 15.4 Connections to Drainage System Required. Receptors, drains, appurtenances, and appliances, used to receive or discharge liquid waste, shall be connected to the drainage system of the building or premises in accordance with the requirements of this Code.
SU 15.5 Dry Storage Systems.
SU 15.5.1 Waterproofing. The containment structure for dry thermal storage systems shall be constructed in an approved manner to prevent the infiltration of water or moisture.
SU 15.5.2 Detecting Water Intrusion. The containment structure shall be capable of fully containing spillage or moisture accumulation that occurs. The structure shall have a means, such as a sight glass, to detect spillage or moisture accumulation, and shall be fitted with a drainage device to eliminate spillage.
SU 15.5.3 Rock as Storage Material. Systems utilizing rock as the thermal storage material shall use clean, washed rock that is free of organic material.
SU 15.5.4 Odor and Particulate Control. Thermal storage materials and containment structures, including interior protective coating, shall not impart toxic elements, particulate matter, or odor to areas of human occupancy.
SU 15.6 Heat Pumps. Heat pumps shall be in compliance with Table S 15.6, as applicable. Heat pumps shall also be listed and labeled in accordance with UL 1995 or UL 60335-2-40. Heat pumps shall be fitted with a means to indicate that the compressor is locked out. comply with UL 1995 or UL 60335-2-40. Air-source heat pumps shall also comply with AHRI 210/240. In addition, ground-source heat pumps
HOA.105559019.8 71
shall comply with AHRI/ASHRAE/ISO 13256-1 for water-to-air heat pumps and AHRI/ASHRAE/ISO 13256-2 for water-to-water heat pumps. Heat pumps shall be fitted with a means to indicate that the compressor is locked out.
TABLE S 15.6
TYPE OF HEAT PUMP STANDARDS
Water-to-Air AHRI/ASHRAE/ISO 13256-1
Water-to-Water AHRI/ASHRAE/ISO 13256-2
Air Source AHRI 210/240
SU 16.0 Solar Thermal Energy Systems for Swimming Pool, Spas, and Hot Tubs.
SU 16.1 Water Chemistry. Where water from a swimming pool, spa, or hot tub is heated by way of circulation through solar collectors, the chemistry of such water shall comply with the requirements of Section SU 16.2 and shall be filtered in accordance with Section SU 16.3 and Section SU 16.3.1 of this Code.
SU 16.2 Parameters. Parameters for chemicals used within a swimming pool, spa, or hot tub shall be in accordance with Table SU 16.2.
TABLE SU 16.2
WATER CHEMISTRY
PARAMETER ACCEPTABLE RANGE
Calcium hardness
200 – 400 parts per million (ppm)
Langelier Saturation Index 0 (+ or - 0.3 acceptable)
pH 7.2 – 7.8
TDS < 1500 ppm
Total alkalinity 80 – 120 ppm
For SI Units: 1 part per million = 1 mg/L
SU 16.3 Filter. A filter shall be provided to remove debris from the water entering the solar loop.
HOA.105559019.8 72
Exception: A solar swimming pool, spa, or hot tub heating system with a heat exchanger.
SU 16.3.1 Location. A filter shall be located upstream of a pump used to direct water to solar collectors.
SU 16.4 Corrosion Resistant. Glazed solar collectors made of copper shall not be used for solar pool, spa, or hot tub heating.
Exception: Where a heat exchanger is provided between the collector circuit and the swimming pool, spa, or hot tub water.
SU 17.0 Certificate of Compliance. Upon completion of the solar thermal energy system, the permittee shall sign a Certificate of Compliance with this Code. The Certificate of Compliance shall also list the following information:
(1) Type of freeze protection;
(2) Mixing valve setting degrees Fahrenheit (º F);
(3) Subsystem working pressure (if applicable) pounds per square inch; (4) Subsystem test pressure (if applicable) pounds per square inch; (5) Heat exchanger make and model number (if applicable); (6) Circulating pump over temperature protection shut-off setting degrees Fahrenheit (º F) for one-tank systems where the water heater controls utilize fusible-link type over temperature protection.
This Certificate shall be posted in a conspicuous location at or near the water heater.
HOA.105559019.8 73
SU 18.0 General.
SU 18.1 Referenced Standards. The standards listed in Table SU 18.1 are referenced in various sections of this Appendix and shall be considered part of the requirements of this Code. The standards are listed herein by the standard number and effective date, the title and application. The application of the referenced standard(s) shall be as specified in Section SU 5.2.
SECTION 29. Table S 18.1 is hereby deleted and replaced by Table U 18.1 to read as follows:
TABLE S 18.1
REFERENCED STANDARDS
STANDARD NUMBER STANDARD
TITLE
APPLICATION
AHRI 210/240-2017 Performance Rating of Unitary Air-conditioning & Airsource Heat Pump EquipmentAir-Source Heat Pumps
AHRI 870-2016 Performance Rating of Direct Geoexchange Heat Pumps Equipment
AHRI/ASHRAE/ISO
13256-1-1998 (R2012)
Water-Source Heat Pumps – Testing and Rating for
Performance – Part 1: Water-to-Air and Brine-to-Air Heat Pumps
Water-Source Heat
Pumps
AHRI/ASHRAE/ISO
13256-2-1998 (R2012)
Water-Source Heat Pumps – Testing and Rating for
Performance – Part 2: Water-to-Water and Brine-to-Water Heat Pumps
Water-Source Heat
Pumps
ASHRAE 34-2019 Designation and Safety Classification of Refrigerants Refrigerant Classifications
ASHRAE 194-2017 Method of Test for Direct-Expansion Ground-Source Heat Pumps
Ground-Source Heat
Pumps
ASME A112.1.2-2012
(R2017)
Air Gaps in Plumbing Systems (for Plumbing Fixtures and Water-Connected Receptors)
Backflow Protection
ASME A112.1.3-2000
(R2015)
Air Gap Fittings for Use with Plumbing Fixtures,
Appliances, and Appurtenances
Backflow Protection
ASME A112.4.1-2009
(R2019)
Water Heater Relief Valve Drain Tubes Discharge Piping
ASME B1.20.1-2013
(R2018)
Pipe Threads, General Purpose (Inch) Joints
ASME B16.3-2016 Malleable Iron Threaded Fittings: Classes 150 and 300 Fittings ASME B16.5-2017 Pipe Flanges and Flanged Fittings: NPS 1⁄2 Through NPS 24 Metric/Inch
Fittings
HOA.105559019.8 74
ASME B16.9-2018 Factory-Made Wrought Buttwelding Fittings Fittings ASME B16.11-2016 Forged Fittings, Socket-Welding and Threaded Fittings ASME B16.15-2018 Cast Copper Alloy Threaded Fittings: Classes 125 and 250
Fittings
ASME B16.18-2018 Cast Copper Alloy Solder Joint Pressure Fittings Fittings ASME B16.22-2018 Wrought Copper and Copper Alloy Solder-Joint Pressure Fittings
Fittings
ASME B16.23-2016 Cast Copper Alloy Solder Joint Drainage Fittings: DWV Fittings ASME B16.24-2016 Cast Copper Alloy Pipe Flanges, Flanged Fittings, and Valves: Classes 150, 300, 600, 900, 1500, and 2500
Fittings
ASME B16.26-2018 Cast Copper Alloy Fittings for Flared Copper Tubes Fittings ASME B16.29-2017 Wrought Copper and Wrought Copper Alloy Solder-Joint Drainage Fittings – DWV
Fittings
ASME B16.51-2018 Copper and Copper Alloy Press-Connect Pressure Fittings
Fittings
ASME BPVC Section
VIII.1-2019
Rules for Construction of Pressure Vessels Division 1 Miscellaneous ASME BPVC Section X2019Fiber-Reinforced Plastic Pressure Vessels Pressure Vessel Construction,
Pressure Vessels
ASME SA194-2015 Carbon and Alloy Steel Nuts for Bolts for High Pressure or High Temperature Service, or Both
Mounting
ASSE 1013-2011 Reduced Pressure Principle Backflow Preventers and Reduced Pressure Principle Fire Protection Backflow
Pre- venters
Backflow Prevention
ASSE 1017-2009 Temperature Actuated Mixing Valves for Hot Water Distribution Systems
Valves
ASSE 1061-2015 Push-Fit Fittings Fittings
ASSE 1079-2012 Dielectric Pipe Unions Fittings
ASTM A53/A53M-2018 Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless
Piping
ASTM A106/A106M2019aSeamless Carbon Steel Pipe for High-Temperature Service
Piping
ASTM A126-2004 (R2019) Gray Iron Castings for Valves, Flanges, and Pipe Fittings Piping ASTM A254/A254M-2012
(R2019)
Copper-Brazed Steel Tubing Piping
ASTM A269/A269M2015a (R2019)Seamless and Welded Austenitic Stainless Steel Tubing for General Service
Piping
ASTM A312/A312M-2019 Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
Piping
ASTM A420/A420M2019aPiping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service
Fittings
ASTM A554-2016 Welded Stainless Steel Mechanical Tubing Piping
HOA.105559019.8 75
ASTM A778/A778M-2016 Welded, Unannealed Austenitic Stainless Steel Tubular Products
Piping
ASTM B32-2008 (R2014) Solder Metal Joints
ASTM B42-2015a Seamless Copper Pipe, Standard Sizes Piping ASTM B43-2015 Seamless Red Brass Pipe, Standard Sizes Piping ASTM B75/B75M-2019 Seamless Copper Tube Piping
ASTM B88-2016 Seamless Copper Water Tube Piping
ASTM B135/B135M-2017 Seamless Brass Tube Piping
ASTM B251/B251M-2017 General Requirements for Wrought Seamless Copper and Copper-Alloy Tube
Piping
ASTM B280-2019 Seamless Copper Tube for Air Conditioning and Refrigeration Field Service
Piping
ASTM B302-2017 Threadless Copper Pipe, Standard Sizes Piping ASTM B447-2012a Welded Copper Tube Piping
ASTM B813-2016 Liquid and Paste Fluxes for Soldering of Copper and Copper Alloy Tube
Joints
ASTM B828-2016 Making Capillary Joints by Soldering of Copper and Copper Alloy Tube and Fittings
Joints
ASTM C411-2019 Hot-Surface Performance of High-Temperature Thermal Insulation
Duct Coverings and
Linings
ASTM D1693-2015 Environmental Stress-Cracking of Ethylene Plastics Piping ASTM D1785-2015 e1 Poly(Vinyl Chloride) (PVC) Plastic Pipe, Schedules 40, 80, and 120
Piping
ASTM D2241-2015 Poly(Vinyl Chloride) (PVC) Pressure-Rated Pipe (SDR Series)
Piping
ASTM D2464-2015 Threaded Poly(Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 80
Fittings
ASTM D2466-2017 Poly(Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 40
Fittings
ASTM D2467-2015 Poly(Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 80
Fittings
ASTM D2513-2019 Polyethylene (PE) Gas Pressure Pipe, Tubing, and Fittings
Piping
ASTM D2564-2012
(R2018)
Solvent Cements for Poly(Vinyl Chloride) (PVC) Plastic
Piping Systems
Joints
ASTM D2609-2015 Plastic Insert Fittings for Polyethylene (PE) Plastic Pipe Fittings ASTM D2683-2014 Socket-Type Polyethylene Fittings for Outside DiameterControlled Polyethylene Pipe and TubingFittings ASTM D2737-2012a Polyethylene (PE) Plastic Tubing Piping
HOA.105559019.8 76
ASTM D2846/D2846M2019aChlorinated Poly(Vinyl Chloride) (CPVC) Plastic Hot- and Cold-Water Distribution Systems
Piping
ASTM D3035-2015 Polyethylene (PE) Plastic Pipe (DR-PR) Based on Controlled Outside Diameter
Piping
ASTM D3139-2019 Joints for Plastic Pressure Pipes Using Flexible Elastomeric Seals
Joints
ASTM D3261-2016 Butt Heat Fusion Polyethylene (PE) Plastic Fittings for Polyethylene (PE) Plastic Pipe and Tubing
Fittings
ASTM D3350-2014 Polyethylene Plastics Pipe and Fittings Materials Piping ASTM E84-2019b Surface Burning Characteristics of Building Materials Miscellaneous ASTM F437-2015 Threaded Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic Pipe Fittings, Schedule 80
Fittings
ASTM F438-2017 Socket-Type Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic Pipe Fittings, Schedule 40
Fittings
ASTM F439-2019 Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic Pipe Fittings, Schedule 80
Fittings
ASTM F441/F441M-2015 Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic Pipe, Schedules 40 and 80
Piping
ASTM F442/F442M-2019 Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic Pipe (SDR-PR)
Piping, Plastic
ASTM F493-2014 Solvent Cements for Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic Pipe and Fittings
Joints
ASTM F656-2015 Primers for Use in Solvent Cement Joints of Poly (Vinyl Chloride) (PVC) Plastic Pipe and Fittings
Joints
ASTM F714-2013 (R2019) Polyethylene (PE) Plastic Pipe (DR-PR) Based on Outside Diameter
Piping
ASTM F876-2019a Crosslinked Polyethylene (PEX) Tubing Piping ASTM F877-2019 Crosslinked Polyethylene (PEX) Hot- and Cold-Water Distribution Systems
Piping
ASTM F1055-2016a Electrofusion Type Polyethylene Fittings for Outside Diameter Controlled Polyethylene and Crosslinked
Polyethylene (PEX) Pipe and Tubing
Fittings
ASTM F1281-2017 Crosslinked Polyethylene/ Aluminum/Crosslinked Polyethylene (PEX-AL-PEX) Pressure Pipe
Piping
ASTM F1282-2017 Polyethylene/Aluminum/Polyethylene (PE-AL-PE) Compo- site Pressure Pipe
Piping
ASTM F1476-2007
(R2019)
Performance of Gasketed Mechanical Couplings for Use
in Piping Applications
Fittings
ASTM F1548-2001
(R2018)
Performance of Fittings for Use with Gasketed
Mechanical Couplings Used in Piping Applications
Fittings
ASTM F1807-2019b Metal Insert Fittings Utilizing a Copper Crimp Ring, or Alternate Stainless Steel Clamps, for SDR9 Cross-linked Polyethylene (PEX) Tubing and SDR9 Polyethylene of
Raised Temperature (PE-RT) Tubing
Fittings
ASTM F1960-2019a Cold Expansion Fittings with PEX Reinforcing Rings for Use with Cross-linked Polyethylene (PEX) and
Polyethylene of Raised Temperature (PE-RT) Tubing
Fittings
ASTM F1970-2019 Special Engineered Fittings, Appurtenances or Valves for Use in Poly (Vinyl Chloride) (PVC) or Chlorinated Poly
Piping
HOA.105559019.8 77
(Vinyl Chloride) (CPVC) Systems
ASTM F1974-2009
(R2015)
Metal Insert Fittings for
Polyethylene/Aluminum/Polyethylene and Crosslinked
Polyethylene/Aluminum/Crosslinked Polyethylene
Composite Pressure Pipe
Fittings
ASTM F2080-2019 Cold-Expansion Fittings with Metal Compression-Sleeves for Crosslinked Polyethylene (PEX) Pipe and SDR9
Polyethylene of Raised Temperature (PE-RT) Pipe
Fittings
ASTM F2098-2018 Stainless Steel Clamps for Securing SDR9 Cross-linked Polyethylene (PEX) Tubing and SDR9 Polyethylene of
Raised Temperature (PE-RT) to Metal Insert and Plastic
Insert Fittings
Fittings
ASTM F2159-2019a Plastic Insert Fittings Utilizing a Copper Crimp Ring, or Alternate Stainless Steel Clamps for SDR9 Cross-linked
Polyethylene (PEX) Tubing and SDR9 Polyethylene of
Raised Temperature (PE-RT) Tubing
Fittings
ASTM F2165-2019 Flexible Pre-Insulated Plastic Piping Fittings, Piping and Tubing
ASTM F2389-2019 Pressure-Rated Polypropylene (PP) Piping Systems Piping ASTM F2434-2019 Metal Insert Fittings Utilizing a Copper Crimp Ring for SDR9 Cross-linked Polyethylene (PEX) Tubing and
SDR9 Cross-linked Polyethylene/Aluminum/Cross-linked
Polyethylene (PEX-AL-PEX) Tubing
Fittings
ASTM F2620-2019 Heat Fusion Joining of Polyethylene Pipe and Fittings Joints ASTM F2623-2019 Polyethylene of Raised Temperature (PE-RT) Systems for Non-Potable Water Applications
Piping
ASTM F2735-2018 Plastic Insert Fittings for SDR9 Cross-linked Polyethylene (PEX) and Polyethylene of Raised
Temperature (PE-RT) Tubing
Fittings
ASTM F2769-2018 Polyethylene of Raised Temperature (PE-RT) Plastic Hot and Cold-Water Tubing and Distribution Systems
Piping, Fitting
ASTM F2855-2019 Chlorinated Poly (Vinyl Chloride)/Aluminum/Chlorinated Poly (Vinyl Chloride) (CPVC-AL-CPVC) Composite
Pressure Tubing
Piping, Plastic
ASTM F3226/F3226M2019Metallic Press-Connect Fittings for Piping and Tubing Systems
Fittings
ASTM F3253-2019 Crosslinked Polyethylene (PEX) Tubing with Oxygen Barrier for Hot- and Cold-Water Hydronic Distribution
Systems
Piping, Fittings
ASTM F3347-2019a Metal Press Insert Fittings with Factory Assembled Stainless Steel Press Sleeve for SDR9 Cross-linked
Polyethylene (PEX) Tubing
Fittings
ASTM F3348-2019 Plastic Press Insert Fittings with Factory Assembled Stainless Steel Press Sleeve for SDR9 Cross-linked
Polyethylene (PEX) Tubing
Fittings
AWS A5.8M/A5.8-2019 Filler Metals for Brazing and Braze Welding Joints AWWA C901-2017 Polyethylene (PE) Pressure Pipe and Tubing, 3⁄4 In. (19 mm) Through 3 In. (76 mm), for Water Service
Piping
HOA.105559019.8 78
CSA B137.1-2017 Polyethylene (PE) Pipe, Tubing, and Fittings for ColdWater Pressure ServicesPiping CSA B137.2-2017 Polyvinylchloride (PVC) Injection-Moulded Gasketed Fittings for Pressure Applications
Fittings
CSA B137.3-2017 Rigid Polyvinylchloride (PVC) Pipe and Fittings for Pressure Applications
Piping, Fittings
CSA B137.5-2017 Crosslinked Polyethylene (PEX) Tubing Systems for Pressure Applications
Piping
CSA B137.6-2017 Chlorinated Polyvinylchloride (CPVC) Pipe, Tubing, and Fittings for Hot- and Cold-Water Distribution
Systems
Piping, Fittings
CSA B137.9-2017 Polyethylene/Aluminum/Polyethylene (PE-AL-PE) Composite Pressure-Pipe Systems
Piping
CSA B137.10-2017 Crosslinked Polyethylene/Aluminum/Crosslinked Polyethylene (PEX-AL-PEX) Composite Pressure-Pipe
Systems
Piping
CSA B137.11-2017 Polypropylene (PP-R) Pipe and Fittings for Pressure Applications
Piping
CSA B137.18-2017 Polyethylene of Raised Temperature Resistance (PERT) Tubing Systems for Pressure ApplicationsPiping, Fittings CSA C22.2 No. 108-2014
(R2019)
Liquid Pumps Pumps
CSA C448.1-2016 Design and Installation of Ground Source Heat Pump Systems for Commercial and Institutional Buildings
Ground-Source Heat
Pumps
CSA C448.2-2016 Design and Installation of Ground Source Heat Pump Systems for Residential and Other Small Buildings
Ground-Source Heat
Pumps
CSA/IGSHPA C448-2016 Design and Installation of Ground Source Heat Pump Systems for Commercial and Residential Buildings
Miscellaneous
CSA Z21.10.1-2019 Gas Water Heaters, Volume I, Storage Water Heaters with Input Ratings of 75,000 Btu Per Hour or Less (same as CSA 4.1)
Fuel Gas, Appliances
CSA Z21.10.3-2019 Gas-Fired Water Heaters, Volume III, Storage Water Heaters with Input Ratings Above 75,000 Btu Per Hour,
Circulating and Instantaneous (same as CSA 4.3)
Fuel Gas, Appliances
IAPMO PS 117-2019 Press Connections Fittings
IAPMO S1001.1-2013
(R2019)
Design and Installation of Solar Water Heating Systems Solar Thermal Systems ICC 900/SRCC 300-2015 Solar Thermal System Standard Solar Thermal Systems ICC 901/SRCC 100-2015 Solar Thermal Collector Standard Collectors NFPA 70-2020 National Electrical Code Miscellaneous
NGWA-01-2014 Water Well Construction Standard Geothermal NSF 60-2019 Drinking Water Treatment Chemicals-Health Effects Backfill
HOA.105559019.8 79
NSF 61-2019 Drinking Water System Components - Health Effects Miscellaneous NSF 358-1-2017 Polyethylene Pipe and Fittings for Water-Based GroundSource "Geothermal" Heat Pump SystemsPiping, Fittings NSF 358-2-2017 Polypropylene Pipe and Fittings for Water-Based GroundSource "Geothermal" Heat Pump SystemsPiping, Fittings NSF 358-3-2016 Cross-Linked Polyethylene (PEX) Pipe and Fittings for Water- Based Ground-Source
(Geothermal) Heat Pump Systems
Piping, Fittings
NSF 358-4-2018 Polyethylene of Raised Temperature (PE-RT) Tubing and Fittings for Water-Based GroundSource (Geothermal) Heat Pump Systems Piping, Fittings
UL 723-2018 Test for Surface Burning Characteristics of Building Materials
Miscellaneous
UL 778-2016 Motor-Operated Water Pumps (with revisions
through January 17, 2019)
Pumps
UL 834-2004 Heating, Water Supply, and Power Boilers –
Electric (with revisions through July 17,
2019)
Appliances
UL 1279-2010 Outline of Investigation for Solar Collectors Electrical UL 1699B-2018 Photovoltaic (PV) DC Arc-Fault Circuit
Protection
Electrical
UL 1703-2002 Flat-Plate Photovoltaic Modules and Panels (with revisions through November 25, 2019)
Electrical
UL 1741-2010 Inverters, Converters, Controllers and
Interconnection System Equipment for Use
With Distributed Energy Resources (with
revisions through February 15, 2018)
Electrical
UL 1995-2015 Heating and Cooling Equipment (with
revisions through August 17, 2018)
Heat Pumps
UL 2523-2009 Solid Fuel-Fired Hydronic Heating Appliances, Water Heaters, and Boilers (with revisions through March 16,
2018)
Fuel Gas, Appliances
UL 2703-2015 Mounting Systems, Mounting Devices,
Clamping/Retention Devices, and Ground Lugs for Use
with Flat-Plate Photovoltaic Modules and Panels (with
revisions through December 16, 2019)
Electrical
UL 2989-2016 Outline of Investigation for Tracer Wire Tracer Wire UL 3703-2015 Solar Trackers Electrical
UL 4703-2014 Photovoltaic Wire Electrical
UL 6703-2014 Connectors for Use in Photovoltaic Systems (with revisions through December 22, 2017)
Electrical
UL 8703-2011 Outline of Investigation for Concentrator Photovoltaic Mod- ules and Assemblies
Electrical
UL 60335-2-40-2017 Household And Similar Electrical Appliances-SafetyPart 2- 40: Particular Requirements for Electrical Heat Pumps, Air- Conditioners and Dehumidifiers
Heat Pumps
UL 61730-1-2017 Photovoltaic (PV) Module Safety Qualification - Part 1:
Requirements for Construction
Electrical
UL 61730-2-2017 Photovoltaic (PV) Module Safety Qualification - Part 2:
Requirements for Testing
Electrical
HOA.105559019.8 80
UL 62109-1-2014 Safety of Power Converters for Use in Photovoltaic Power Systems - Part 1: General Requirements (with
revisions through April 30, 2019)
Electrical
ASHRAE 90.1-2019 Energy Standard for Buildings Except Low-Rise Residential Buildings
Energy
ASHRAE 93-2010 (RA2014) Methods of Testing to Determine the Thermal Performance of Solar Collectors
Testing
ASHRAE 95-1981
(RA1987)
Methods of Testing to Determine the Thermal
Performance of Solar Domestic Water Heating Systems
Testing
ASHRAE 96-1980
(RA1989)
Thermal Performance of Unglazed Flat-Plate LiquidType Solar CollectorsTesting, Collector ASME A13.1-2015 Scheme for the Identification of Piping Systems Piping ASME B16.21-2016 Nonmetallic Flat Gaskets for Pipe Flanges Joints ASME B16.34-2017 Valves - Flanged, Threaded, and Welding End Valves ASME B16.47-2017 Large Diameter Steel Flanges: NPS 26 Through NPS 60 Metric/Inch
Fittings
ASME BPVC Section IV2017Rules for Construction of Heating Boilers Miscellaneous ASME BPVC Section IX2017Welding, Brazing, and Fusing Qualifications Certification ASSE 1010-2004 Water Hammer Arresters Water Supply Component ASTM A377-2018 Ductile Iron Pressure Pipe Piping, Ferrous ASTM A733-2016 Welded and Seamless Carbon Steel and Austenitic Stainless Steel Pipe Nipples
Piping, Ferrous
ASTM D56-2016a Flash Point by Tag Closed Cup Tester Testing ASTM D93-2019 Flash Point by Pensky-Martens Closed Cup Tester Testing ASTM D635-2018 Rate of Burning and/or Extent and Time of Burning of Plastics in a Horizontal Position
Testing
ASTM D2235-2004
(R2016)
Solvent Cement for Acrylonitrile-Butadiene-Styrene
(ABS) Plastic Pipe and Fittings
Joints
ASTM D2672-2014 Joints for IPS PVC Pipe Using Solvent Cement Joints ASTM D2855-2015 Two-Step (Primer and Solvent Cement) Method of Joining Poly (Vinyl Chloride) (PVC) or Chlorinated Poly (Vinyl Chloride) (CPVC) Pipe and Piping Components
with Tapered Sockets
Joints
ASTM D3278-1996
(R2011)
Flash Point of Liquids by Small Scale Closed-Cup
Apparatus
Testing
ASTM E136-2019a Assessing Combustibility of Materials Using a Vertical Tube Furnace at 750°C
Furnace
ASTM F480-2014 Thermoplastic Well Casing Pipe and Couplings Made in Standard Dimension Ratios (SDR), SCH 40 and
SCH 80
Piping, Plastic
ASTM F891-2016 Coextruded Poly(Vinyl Chloride) (PVC) Plastic Pipe with a Cellular Core
Piping, Plastic
AWS B2.2/B2.2M-2016 Brazing Procedure and Performance Qualification Certification AWWA C507-2018 Ball Valves, 6 In. through 60 In. (150 mm Through 1,500 mm)
Valves
HOA.105559019.8 81
BS EN 12975-1-2006
(R2010)
Thermal Solar Systems and Components – Solar
Collectors – Part 1: General Requirements
Collector
BS EN 12976-1-2017 Thermal Solar Systems and Components – Factory Made Systems – Part 1: General Requirements
Solar Thermal Systems
BS EN 12976-2-2017 Thermal Solar Systems and Components – Factory Made Systems – Part 2: Test Methods
Solar Thermal Systems
BS EN ISO 9806-2017 Solar Energy – Solar Thermal Collectors – Test Methods Collector BS EN ISO 9488-2000 Solar Energy – Vocabulary Miscellaneous CSA Z21.22-2015 Relief Valves for Hot Water Supply Systems (same as CSA 4.4)
Valves
TABLE U 18.1
REFERENCED STANDARDS
STANDARD NUMBER STANDARD TITLE APPLICATION
AHRI
AHRI 210/240-2020 Performance Rating of Unitary Airconditioning & Air- source Heat Pump Equipment
Air-Source Heat Pumps
AHRI 870-2016 Performance Rating of Direct
Geoexchange Heat Pumps
Equipment
AHRI/ASHRAE/ISO 13256-1-
1998 (R2012)
Water-Source Heat Pumps – Testing and
Rating for Performance – Part 1: Waterto-Air and Brine-to-Air Heat Pumps Water-Source Heat Pumps
AHRI/ASHRAE/ISO 13256-2-
1998 (R2012)
Water-Source Heat Pumps – Testing and
Rating for Performance – Part 2: Waterto-Water and Brine-to-Water Heat Pumps Water-Source Heat Pumps
ASHRAE
AHRI/ASHRAE/ISO 13256-1-
1998 (R2012)
Water-Source Heat Pumps – Testing and
Rating for Performance – Part 1: Water-toAir and Brine-to-Air Heat Pumps Water-Source Heat Pumps
AHRI/ASHRAE/ISO 13256-2-
1998 (R2012)
Water-Source Heat Pumps – Testing and
Rating for Performance – Part 2: Water-toWater and Brine-to-Water Heat Pumps Water-Source Heat Pumps
ASHRAE 34-2022 Designation and Safety Classification of Refrigerants
Refrigerant Classifications
ASHRAE 194-2017 Method of Test for Direct-Expansion
Ground-Source Heat Pumps
Ground-Source Heat Pumps
ASME
ASME A112.1.2-2012
(R2022)
Air Gaps in Plumbing Systems (for
Plumbing Fixtures and Water-Connected
Receptors)
Backflow Protection
ASME A112.1.3-2000
(R2019)
Air Gap Fittings for Use with
Plumbing Fixtures, Appliances, and
Appurtenances
Backflow Protection
ASME A112.4.1-2009
(R2019)
Water Heater Relief Valve Drain
Tubes
Discharge Piping
ASSE 1070/ASME
A112.1070/CSA B125.70- 2020
Water Temperature Limiting
Devices
Valves
ASME B1.20.1-2013
(R2018)
Pipe Threads, General Purpose
(Inch)
Joints
ASME B16.3-2021 Malleable Iron Threaded Fittings: Fittings
HOA.105559019.8 82
Classes 150 and 300
ASME B16.5-2020 Pipe Flanges and Flanged Fittings:
NPS 1⁄2 Through NPS 24 Metric/Inch
Fittings
ASME B16.9-2018 Factory-Made Wrought
Buttwelding Fittings
Fittings
ASME B16.11-2021 Forged Fittings, Socket-Welding
and Threaded
Fittings
ASME B16.15-2018 Cast Copper Alloy Threaded
Fittings: Classes 125 and 250
Fittings
ASME B16.18-2021 Cast Copper Alloy Solder Joint
Pressure Fittings
Fittings
ASME B16.22-2021 Wrought Copper and Copper Alloy
Solder-Joint Pressure Fit- tings
Fittings
ASME B16.23-2021 Cast Copper Alloy Solder Joint
Drainage Fittings: DWV
Fittings
ASME B16.24-2021 Cast Copper Alloy Pipe Flanges,
Flanged Fittings, and Valves: Classes
150, 300, 600, 900, 1500, and 2500
Fittings
ASME B16.26-2018 Cast Copper Alloy Fittings for
Flared Copper Tubes
Fittings
ASME B16.29-2017 Wrought Copper and Wrought
Copper Alloy Solder-Joint Drainage
Fittings – DWV
Fittings
ASME B16.51-2021 Copper and Copper Alloy PressConnect Pressure FittingsFittings ASME BPVC Section
VIII.1-2021
Rules for Construction of Pressure
Vessels Division 1
Miscellaneous
ASME BPVC Section X2021Fiber-Reinforced Plastic Pressure Vessels
Pressure Vessel Construction,
Pressure Vessels
ASME SA194-2021 Carbon and Alloy Steel Nuts for
Bolts for High Pressure or High
Temperature Service, or Both
Mounting
ASSE
ASSE 1013-2021 Performance Requirements for Reduced
Pressure Principle Backflow Prevention
Assemblies
Backflow Prevention
ASSE 1017-2009 Performance Requirements for
Temperature Actuated Mix- ing Valves for
Hot Water Distribution Systems
Valves
ASSE 1061-2020 Performance Requirements for Push-Fit
Fittings
Fittings
ASSE 1070/ASME
A112.1070/CSA B125.70- 2020
Water Temperature Limiting Devices Valves
ASSE 1079-2012 (R2021) Performance Requirements for Dielectric Pipe Unions
Fittings
ASTM
ASTM A53/A53M-2022 Standard Specification for Pipe, Steel, Black and Hot- Dipped, Zinc-Coated,
Welded and Seamless
Piping
ASTM A106/A106M- 2019a Standard Specification for Seamless Carbon Steel Pipe for HighTemperature Service
Piping
ASTM A126-2004
(R2019)
Standard Specification for Gray Iron
Castings for Valves, Flanges, and Pipe
Fittings
Piping
HOA.105559019.8 83
ASTM A254/A254M-2012
(R2019)
Standard Specification for Copper-Brazed
Steel Tubing
Piping
ASTM A269/A269M-2022 Standard Specification for Seamless and Welded Austenitic Stainless Steel
Tubing for General Service
Piping
ASTM A312/A312M- 2022a Standard Specification for Seamless, Welded, and Heavily Cold Worked
Austenitic Stainless Steel Pipes
Piping
ASTM A420/A420M-2022 Standard Specification for Piping
Fittings of Wrought Car- bon Steel and
Alloy Steel for Low-Temperature
Service
Fittings
ASTM A554-2021 Standard Specification for Welded
Stainless Steel Mechanical Tubing
Piping
ASTM A778/A778M-2022 Standard Specification for Welded, Unannealed Austenitic Stainless Steel
Tubular Products
Piping
ASTM B32-2020 Standard Specification for Solder Metal Joints ASTM B42-2020 Standard Specification for Seamless
Copper Pipe, Standard Sizes
Piping
ASTM B43-2020 Standard Specification for Seamless
Red Brass Pipe, Standard Sizes
Piping
ASTM B75/B75M-2020 Standard Specification for Seamless
Copper Tube
Piping
ASTM B88-2022 Standard Specification for Seamless
Copper Water Tube
Piping
ASTM B135/B135M-2017 Standard Specification for Seamless Brass Tube
Piping
ASTM B251/B251M-2017 Standard Specification for General Requirements for Wrought Seamless
Copper and Copper-Alloy Tube
Piping
ASTM B280-2020 Standard Specification for Seamless
Copper Tube for Air Conditioning and
Refrigeration Field Service
Piping
ASTM B302-2017 Standard Specification for Threadless
Copper Pipe, Standard Sizes
Piping
ASTM B447-2012a (R2021) Standard Specification for Welded Copper Tube
Piping
ASTM B813-2016 Standard Specification for Liquid and
Paste Fluxes for Soldering of Copper
and Copper Alloy Tube
Joints
ASTM B828-2016 Standard Practice for Making Capillary
Joints by Soldering of Copper and
Copper Alloy Tube and Fittings
Joints
ASTM C411-2019 Standard Test Method for Hot-Surface
Performance of High- Temperature
Thermal Insulation
Duct Coverings and Linings
ASTM D1693-2021 Standard Test Method for
Environmental Stress-Cracking of
Ethylene Plastics
Piping
ASTM D1785-2021a Standard Specification for Poly(Vinyl
Chloride) (PVC) Plas- tic Pipe,
Schedules 40, 80, and 120
Piping
ASTM D2241-2020 Standard Specification for Poly(Vinyl
Chloride) (PVC) Pres- sure-Rated Pipe
(SDR Series)
Piping
HOA.105559019.8 84
ASTM D2464-2015 Standard Specification for Threaded
Poly(Vinyl Chloride) (PVC) Plastic Pipe
Fittings, Schedule 80
Fittings
ASTM D2466-2021 Standard Specification for Poly(Vinyl
Chloride) (PVC) Plas- tic Pipe Fittings,
Schedule 40
Fittings
ASTM D2467-2020 Standard Specification for Poly(Vinyl
Chloride) (PVC) Plas- tic Pipe Fittings,
Schedule 80
Fittings
ASTM D2564-2020 Standard Specification for Solvent
Cements for Poly(Vinyl Chloride) (PVC)
Plastic Piping Systems
Joints
ASTM D2609-2021 Standard Specification for Plastic Insert Fittings for Polyethylene (PE) Plastic
Pipe
Fittings
ASTM D2683-2020 Standard Specification for Socket-Type
Polyethylene Fittings for Outside
Diameter-Controlled Polyethylene Pipe
and Tubing
Fittings
ASTM D2737-2022 Standard Specification for Polyethylene (PE) Plastic Tubing
Piping
ASTM D2846/D2846M- 2019a Standard Specification for Chlorinated Poly(Vinyl Chloride) (CPVC) Plastic Hotand Cold-Water Distribution Systems Piping
ASTM D3035-2022 Standard Specification for Polyethylene (PE) Plastic Pipe (DR-PR) Based on
Controlled Outside Diameter
Piping
ASTM D3138-2021 Standard Specification for Solvent
Cements for Transition Joints Between
Acrylonitrile-Butadiene-Styrene (ABS)
and Poly(Vinyl Chloride) (PVC) NonPressure Piping Components Joints
ASTM D3139-2019 Standard Specification for Joints for
Plastic Pressure Pipes Using Flexible
Elastomeric Seals
Joints
ASTM D3261-2016 Standard Specification for Butt Heat
Fusion Polyethylene (PE) Plastic
Fittings for Polyethylene (PE) Plastic
Pipe and Tubing
Fittings
ASTM D3350-2021 Standard Specification for Polyethylene Plastics Pipe and Fittings Materials
Piping
ASTM E84-2023 Standard Test Method for Surface
Burning Characteristics of Building
Materials
Miscellaneous
ASTM F437-2021 Standard Specification for Threaded
Chlorinated Poly (Vinyl Chloride)
(CPVC) Plastic Pipe Fittings, Schedule
80 Fittings
ASTM F438-2017 Standard Specification for Socket-Type
Chlorinated Poly (Vinyl Chloride)
(CPVC) Plastic Pipe Fittings, Schedule
40 Fittings
ASTM F439-2019 Standard Specification for Chlorinated
Poly (Vinyl Chloride) (CPVC) Plastic
Pipe Fittings, Schedule 80
Fittings
HOA.105559019.8 85
ASTM F441/F441M-2020 Standard Specification for Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic
Pipe, Schedules 40 and 80
Piping
ASTM F442/F442M-2020 Standard Specification for Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic
Pipe (SDR-PR)
Piping, Plastic
ASTM F493-2022 Standard Specification for Solvent
Cements for Chlorinated Poly (Vinyl
Chloride) (CPVC) Plastic Pipe and
Fittings
Joints
ASTM F656-2021 Standard Specification for Primers for
Use in Solvent Cement Joints of Poly
(Vinyl Chloride) (PVC) Plastic Pipe and
Fittings
Joints
ASTM F714-2022 Standard Specification for Polyethylene
(PE) Plastic Pipe (DR-PR) Based on
Outside Diameter
Piping
ASTM F876-2023 Standard Specification for Crosslinked
Polyethylene (PEX) Tubing
Piping
ASTM F877-2023 Standard Specification for Crosslinked
Polyethylene (PEX) Hot- and ColdWater Distribution Systems Piping
ASTM F1055-2016a (R2022) Standard Specification for Electrofusion Type Polyethylene Fittings for Outside
Diameter Controlled Polyethylene and
Crosslinked Polyethylene (PEX) Pipe
and Tubing
Fittings
ASTM F1281-2023 Standard Specification for Crosslinked
Polyethylene/ Aluminum/Crosslinked
Polyethylene (PEX-AL-PEX) Pressure
Pipe
Piping
ASTM F1282-2017 Standard Specification for
Polyethylene/Aluminum/Poly- ethylene
(PE-AL-PE) Composite Pressure Pipe
Piping
ASTM F1476-2007 (R2019) Standard Specification for Performance of Gasketed Mechanical Couplings for
Use in Piping Applications
Fittings
ASTM F1548-2001 (R2018) Standard Specification for Performance of Fittings for Use with Gasketed
Mechanical Couplings Used in Piping
Applications
Fittings
ASTM F1807-2023 Standard Specification for Metal Insert Fittings Utilizing a Copper Crimp Ring,
or Alternate Stainless Steel Clamps, for
SDR9 Cross-linked Polyethylene (PEX)
Tubing and SDR9 Polyethylene of
Raised Temperature (PE-RT) Tubing
Fittings
ASTM F1960-2023 Standard Specification for Cold
Expansion Fittings with PEX Reinforcing
Rings for Use with Cross-linked
Polyethylene (PEX) and Polyethylene of
Raised Temperature (PE-RT) Tubing
Fittings
ASTM F1970-2023 Standard Specification for Special
Engineered Fittings, Appurtenances or
Valves for Use in Poly (Vinyl Chloride)
(PVC) or Chlorinated Poly (Vinyl
Chloride) (CPVC) Systems
Piping
HOA.105559019.8 86
ASTM F1974-2009 (R2020) Standard Specification for Metal Insert Fittings for
Polyethylene/Aluminum/Polyethylene
and Crosslinked
Polyethylene/Aluminum/Crosslinked
Polyethylene Composite Pressure Pipe
Fittings
ASTM F2080-2023 Standard Specification for ColdExpansion Fittings with Metal Compression-Sleeves for Crosslinked
Polyethylene (PEX) Pipe and SDR9
Polyethylene of Raised Temperature
(PE-RT) Pipe
Fittings
ASTM F2098-2018 Standard Specification for Stainless
Steel Clamps for Securing SDR9 Crosslinked Polyethylene (PEX) Tubing and SDR9 Polyethylene of Raised
Temperature (PE-RT) to Metal Insert
and Plastic Insert Fittings
Fittings
ASTM F2159-2023a Standard Specification for Plastic Insert Fittings Utilizing a Copper Crimp Ring,
or Alternate Stainless Steel Clamps for
SDR9 Cross-linked Polyethylene (PEX)
Tubing and SDR9 Polyethylene of
Raised Temperature (PE-RT) Tubing
Fittings
ASTM F2165-2019 Standard Specification for Flexible PreInsulated Plastic PipingFittings, Piping and Tubing ASTM F2389-2023 Standard Specification for PressureRated Polypropylene (PP) Piping Systems
Pipings
ASTM F2434-2019 Standard Specification for Metal Insert Fittings Utilizing a Copper Crimp Ring
for SDR9 Cross-linked Polyethylene
(PEX) Tubing and SDR9 Cross-linked
Polyethylene/Aluminum/Cross-linked
Polyethylene (PEX-AL-PEX) Tubing
Fittings
ASTM F2620-2020ae2 Standard Practice for Heat Fusion
Joining of Polyethylene Pipe and
Fittings
Joints
ASTM F2623-2022 Standard Specification for Polyethylene of Raised Temperature (PE-RT)
Systems for Non-Potable Water
Applications
Piping
ASTM F2735-2021 Standard Specification for Plastic Insert Fittings for SDR9 Cross-linked
Polyethylene (PEX) and Polyethylene of
Raised Temperature (PE-RT) Tubing
Fittings
ASTM F2769-2023 Standard Specification for Polyethylene of Raised Temperature (PE-RT) Plastic
Hot and Cold-Water Tubing and
Distribution Systems
Piping, Fitting
ASTM F2855-2019 Standard Specification for Chlorinated
Poly (Vinyl Chloride)/Aluminum/Chlorinated Poly (Vinyl Chloride) (CPVC- AL-CPVC) Composite
Pressure Tubing
Piping, Plastic
ASTM F3226/F3226M2019Standard Specification for Metallic Press-Connect Fittings for Piping and
Tubing Systems
Fittings
HOA.105559019.8 87
ASTM F3253-2019 Standard Specification for Crosslinked
Polyethylene (PEX) Tubing with Oxygen
Barrier for Hot- and Cold-Water
Hydronic Distribution Systems
Piping, Fittings
ASTM F3347-2023 Standard Specification for Metal Press
Insert Fittings with Factory Assembled
Stainless Steel Press Sleeve for SDR9
Cross-linked Polyethylene (PEX) Tubing
and SDR9 Polyethylene of Raised
Temperature (PE-RT) Tubing
Fittings
ASTM F3348-2023 Standard Specification for Plastic Press Insert Fittings with Factory Assembled
Stainless Steel Press Sleeve for SDR9
Cross-linked Polyethylene (PEX) Tubing
and SDR9 Polyethylene of Raised
Temperature (PE-RT) Tubing
Fittings
AWS
AWS A5.8M/A5.8-2019 Filler Metals for Brazing and Braze Welding
Joints
AWS A5.9/A5.9M-2022 (ISO
14343-2017 MOD)
Specification for Bare Stainless Steel
Welding Electrodes and Rods
Joints
AWWA
AWWA C110/A21.10- 2021 Ductile-Iron and Gray-Iron Fittings Fittings AWWA C111/A21.11- 2017 Rubber-Gasket Joints for Ductile-Iron Pressure Pipe and Fittings
Joints
AWWA C115/A21.15- 2020 Flanged Ductile-Iron Pipe with DuctileIron or Gray-Iron Threaded FlangesPiping AWWA C151/A21.51- 2017 Ductile-Iron Pipe, Centrifugally Cast Piping AWWA C153/A21.53-2019 Ductile-Iron Compact Fittings Fittings AWWA C901-2020 Polyethylene (PE) Pressure Pipe and
Tubing, 3⁄4 In. (19 mm) Through 3 In.
(76 mm), for Water Service
Piping
CSA
ASSE 1070/ASME
A112.1070/CSA B125.70- 2020
Water Temperature Limiting Devices Valves
CSA B137.1-2020 Polyethylene (PE) Pipe, Tubing, and
Fittings for Cold-Water Pressure
Services
Piping
CSA B137.2-2020 Polyvinylchloride (PVC) InjectionMoulded Gasketed Fittings for Pressure Applications
Fittings
CSA B137.3-2020 Rigid Polyvinylchloride (PVC) Pipe and
Fittings for Pressure Applications
Piping, Fittings
CSA B137.5-2020 Crosslinked Polyethylene (PEX) Tubing
Systems for Pres- sure Applications
Piping
CSA B137.6-2020 Chlorinated Polyvinylchloride (CPVC)
Pipe, Tubing, and Fittings for Hot- and
Cold-Water Distribution Systems
Piping, Fittings
CSA B137.9-2020 Polyethylene/Aluminum/Polyethylene
(PE-AL-PE) Composite Pressure-Pipe
Systems
Piping
HOA.105559019.8 88
CSA B137.10-2020 Crosslinked
Polyethylene/Aluminum/Crosslinked
Polyethylene (PEX-AL-PEX) Composite
Pressure-Pipe Systems
Piping
CSA B137.11-2020 Polypropylene (PP-R & PP-RCT) Pipe
and Fittings for Pressure Applications
Piping
CSA B137.18-2020 Polyethylene of Raised Temperature
Resistance (PE-RT) Tubing Systems for
Pressure Applications
Piping, Fittings
CSA C22.2 No. 108-2014
(R2019)
Liquid Pumps Pumps
ANSI/CSA/IGSHPA C448
Series-2016 (R2021)
Design and Installation of Ground
Source Heat Pump Systems for
Commercial and Residential Buildings
Ground-Source Heat Pumps
CSA/ANSI Z21.10.1-
2019/CSA 4.1-2019
Gas Water Heaters, Volume I, Storage
Water Heaters with Input Ratings of
75,000 Btu Per Hour or Less
Fuel Gas, Appliances
CSA/ANSI Z21.10.3-
2019/CSA 4.3-2019
Gas-Fired Water Heaters, Volume III,
Storage Water Heaters with Input
Ratings Above 75,000 Btu Per Hour,
Circulating and Instantaneous
Fuel Gas, Appliances
IAPMO
IAPMO/ANSI H1001.1- 2021 Standard for Quality of Heat Transfer Fluids Used in Hydronics Systems
Heat Transfer Fluid
IAPMO/ANSI/CAN Z1117-
2022
Standard for Press Connections Fittings
IAPMO IGC 353-2019 e1 Branch Connectors Fittings
IAPMO S1001.1-2013
(R2019)
Design and Installation of Solar Water
Heating Systems
Solar Thermal Systems
ICC
ICC 900/SRCC 300-2020 Solar Thermal System Standard Solar Thermal Systems ICC 901/SRCC 100-2020 Solar Thermal Collector Standard Collectors IGSHPA
ANSI/CSA/IGSHPA C448
Series-2016 (R2021)
Design and Installation of Ground
Source Heat Pump Systems for
Commercial and Residential Buildings
Ground-Source Heat Pumps
ISO
AHRI/ASHRAE/ISO 13256-
1-1998 (R2012)
Water-Source Heat Pumps – Testing
and Rating for Performance – Part 1:
Water-to-Air and Brine-to-Air Heat
Pumps
Water-Source Heat Pumps
AHRI/ASHRAE/ISO 13256-
2-1998 (R2012)
Water-Source Heat Pumps – Testing
and Rating for Performance – Part 2:
Water-to-Water and Brine-to-Water Heat
Pumps
Water-Source Heat Pumps
NFPA
NFPA 70-2023 National Electrical Code Miscellaneous
NGWA
NGWA-01-2014 Water Well Construction Standard Geothermal NSF
HOA.105559019.8 89
NSF/ANSI/CAN 60-2021 Drinking Water Treatment ChemicalsHealth EffectsBackfill NSF/ANSI/CAN 61-2022 Drinking Water System Components - Health Effects
Miscellaneous
NSF/ANSI 358-1-2021 Polyethylene Pipe and Fittings for
Water-Based Ground- Source
“Geothermal” Heat Pump Systems
Piping, Fittings
NSF/ANSI 358-2-2017 Polypropylene Pipe and Fittings for Water-Based Ground- Source
“Geothermal” Heat Pump Systems
Piping, Fittings
NSF/ANSI 358-3-2021 Cross-Linked Polyethylene (PEX) Pipe and Fittings for Water- Based GroundSource (Geothermal) Heat Pump Systems
Piping, Fittings
NSF/ANSI 358-4-2022 Polyethylene of Raised Temperature
(PE-RT) Tubing and Fittings for WaterBased Ground-Source (Geothermal) Heat Pump Systems
Piping, Fittings
NSF/ANSI/CAN 372-2022 Drinking Water System Components - Lead Content
Miscellaneous
SRCC
ICC 900/SRCC 300-2020 Solar Thermal System Standard Solar Thermal Systems ICC 901/SRCC 100-2020 Solar Thermal Collector Standard Collectors UL
UL 98B-2015 Outline of Investigation for Enclosed
and Dead-front Switches for use in
Photovoltaic Systems
Electrical
UL 248-2019 Low-Voltage Fuses – Part 19:
Photovoltaic Fuses (with revisions
through February 28, 2020)
Electrical
UL 489B-2016 Molded-Case Circuit Breakers,
Molded-Case Switches, and CircuitBreaker Enclosures for Use with Photovoltaic (PV) Systems (with
revisions through May 19, 2021)
Electrical
UL 508I-2015 Outline of Investigation for Disconnect
Switches Intended for Use in
Photovoltaic Systems
Electrical
UL 723-2018 Test for Surface Burning Characteristics
of Building Materials
Miscellaneous
UL 778-2016 Motor-Operated Water Pumps (with
revisions through June 29, 2021)
Pumps
UL 834-2004 Heating, Water Supply, and Power
Boilers – Electric (with revisions through
July 17, 2019)
Appliances
UL 1279-2010 Outline of Investigation for Solar
Collectors
Electrical
UL 1699B-2018 Photovoltaic (PV) DC Arc-Fault Circuit
Protection (with revisions through May
18, 2021)
Electrical
UL 1703-2002 Flat-Plate Photovoltaic Modules and
Panels (with revisions through
November 25, 2019)
Electrical
UL 1741-2021 Inverters, Converters, Controllers and
Interconnection System Equipment for
Electrical
HOA.105559019.8 90
Use With Distributed Energy
Resources (with revisions through
October 18, 2022)
UL 1995-2022 Heating and Cooling Equipment Heat Pumps
UL 2523-2009 Solid Fuel-Fired Hydronic Heating
Appliances, Water Heaters, and Boilers
(with revisions through October 20,
2022)
Fuel Gas, Appliances
UL 2703-2015 Mounting Systems, Mounting Devices,
Clamping/Retention Devices, and
Ground Lugs for Use with Flat-Plate
Photovoltaic Modules and Panels (with
revisions through March 24, 2021)
Electrical
UL 2846-2014 Fire Test of Plastic Water
Distribution Plumbing Pipe for Visible
Flame and Smoke Characteristics
(with revisions through January 14,
2021)
Piping
UL 2989-2022 Outline of Investigation for Tracer Wire Tracer Wire UL 3703-2015 Solar Trackers (with revisions through
April 7, 2020)
Electrical
UL 3730-2014 Photovoltaic Junction Boxes (with
revisions through June 11, 2021)
Electrical
UL 3741-2020 Photovoltaic Hazard Control Electrical
UL 4703-2014 Photovoltaic Wire (with revisions through
August 11, 2020)
Electrical
UL 6703-2014 Connectors for Use in Photovoltaic
Systems (with revisions through June 10,
2021)
Electrical
UL 7103-2019 Outline of Investigation for BuildingIntegrated Photovoltaic Roof CoveringsElectrical UL 8703-2011 Outline of Investigation for Concentrator
Photovoltaic Mod- ules and Assemblies
Electrical
UL 60335-2-40-2022 Household and Similar Electrical
Appliances-Safety-Part 2- 40: Particular
Requirements for Electrical Heat Pumps,
Air- Conditioners and Dehumidifiers
Heat Pumps
UL 61730-1-2022 Photovoltaic (PV) Module Safety
Qualification - Part 1: Requirements for
Construction
Electrical
UL 61730-2-2022 Photovoltaic (PV) Module Safety
Qualification - Part 2: Requirements for
Testing
Electrical
UL 62109-1-2014 Safety of Power Converters for Use in
Photovoltaic Power Systems - Part 1:
General Requirements (with revisions
through April 30, 2019)
Electrical
SECTION 30. Table S 18.2 is hereby deleted and replaced by Table U 18.2 to read as follows:
HOA.105559019.8 91
TABLE S 18.2
STANDARDS, PUBLICATIONS, PRACTICES, AND GUIDES
DOCUMENT NUMBER DOCUMENT TITLE APPLICATION
CSA Z21.24-2015 Connectors for Gas Appliances (same as CSA 6.10) Fuel Gas IAPMO IGC 332-2017a Hydronic Radiators Hydronic Systems IEEE 937-2007 Installation and Maintenance of Lead-Acid Batteries for Photovoltaic (PV) Systems
Installation and
Maintenance,
Photovoltaic
IEEE 1013-2019 Sizing Lead-Acid Batteries for Stand-Alone Photovoltaic (PV) Systems
Photovoltaic, Sizing
IEEE 1361-2014 Selecting, Charging, Testing, and Evaluating LeadAcid Batteries Used in Stand-Alone Photovoltaic (PV) Systems
Testing, Evaluation
IEEE 1526-2003 Testing the Performance of Stand-Alone Photovoltaic Systems
Testing, Photovoltaic
IEEE 1547-2018 Interconnection and Interoperability of Distributed Energy Resources with Associated Electric Power
Systems Interfaces
Connections,
Photovoltaic
IEEE 1562-2007 Array and Battery Sizing in Stand-Alone Photovoltaic (PV) Systems
Array, Battery,
Photo- voltaic
IEEE 1661-2019 Test and Evaluation of Lead-Acid Batteries Used in Photovoltaic (PV) Hybrid Power Systems
Testing and
Evaluation,
Photovoltaic
MSS SP-58-2018 Pipe Hangers and Supports – Materials, Design, Manufacture, Selection, Application, and Installation
(including Amendment 1, dated October 17, 2019)
Fuel Gas
MSS SP-80-2019 Bronze Gate, Globe, Angle, and Check Valves Valves NFPA 54/Z223.1-2018 National Fuel Gas Code Fuel Gas
NFPA 274-2018 Test Method to Evaluate Fire Performance Characteristics of Pipe Insulation
Pipe Insulation
NSF 14-2018 Plastic Piping System Components and Related Materials Piping, Plastic UL 174-2004 Household Electric Storage Tank Water Heaters (with revisions through December 3, 2019)
Appliances
UL 873-2007 Temperature-Indicating and -Regulating Equipment (with revisions through February 6, 2015)
Electrical
UL 916-2015 Energy Management Equipment Electrical
UL 1453-2016 Electric Booster and Commercial Storage Tank Water Heaters (with revisions through May 18, 2018)
Appliances
UL 60730-1 2016 Automatic Electrical Controls – Part 1: General Requirements
Electrical
TABLE U 18.2
STANDARDS, PUBLICATIONS, PRACTICES, AND GUIDES
DOCUMENT NUMBER DOCUMENT TITLE APPLICATION
ASHRAE
ASHRAE 90.1-2019 Energy Standard for Buildings Except Low-Rise Residential Buildings
Energy
ASHRAE 93-2010
(RA2014)
Methods of Testing to Determine the Thermal Performance of Solar Collectors
Testing
HOA.105559019.8 92
ASHRAE 95-1981
(RA1987)
Methods of Testing to Determine the Thermal Performance of Solar Domestic Water Heating Systems
Testing
ASHRAE Handbook2021Fundamentals Electrical
ASHRAE 96-1980
(RA1989)
Thermal Performance of Unglazed Flat-Plate Liquid-Type Solar Collectors
Testing, Collector
ASME
ASME A13.1-2020 Scheme for the Identification of Piping Systems Piping ASME B16.21-2021 Nonmetallic Flat Gaskets for Pipe Flanges Joints ASME B16.34-2020 Valves - Flanged, Threaded, and Welding End Valves ASME B16.47-2020 Large Diameter Steel Flanges: NPS 26 Through NPS 60 Metric/Inch
Fittings
ASME BPVC Section IV2021Rules for Construction of Heating Boilers Miscellaneous ASME BPVC Section IX2021Welding, Brazing, and Fusing Qualifications Certification ASSE
ASSE 1010-2021 Performance Requirements for Water Hammer Arresters Water Supply Component ASTM
ASTM A377-2018
(R2022)e1
Standard Index of Specifications for Ductile Iron Pressure Pipe Piping, Ferrous ASTM A733-2016
(R2022)
Standard Specification for Welded and Seamless Carbon Steel and Austenitic Stainless Steel Pipe Nipples
Piping, Ferrous
ASTM D56-2022 Standard Test Method for Flash Point by Tag Closed Cup Tester Testing ASTM D93-2020 Standard Test Method for Flash Point by Pensky-Martens Closed Cup Tester
Testing
ASTM D635-2022 Standard Test Methods for Rate of Burning and/or Extent and Time of Burning of Plastics in a Horizontal Position
Testing
ASTM D2235-2022 Standard Specification for Solvent Cement for AcrylonitrileButadiene-Styrene (ABS) Plastic Pipe and FittingsJoints ASTM D2672-2020 e1 Standard Specification for Joints for IPS PVC Pipe Using Solvent Cement
Joints
ASTM D2855-2020 Standard Practice for the Two-Step (Primer and Solvent Cement) Method of Joining Poly (Vinyl Chloride) (PVC) or Chlorinated Poly (Vinyl Chloride) (CPVC) Pipe and Piping Components with Tapered Sockets
Joints
ASTM D3278-2021 Standard Test Method for Flash Point of Liquids by Small Scale Closed-Cup Apparatus
Testing
ASTM E136-2022 Standard Test Method for Assessing Combustibility of Materials Using a Ver- tical Tube Furnace at 750°C
Furnace
ASTM F480-2014
(R2022)
Standard Specification for Thermoplastic Well Casing Pipe and Couplings Made in Standard Dimension Ratios (SDR), SCH 40 and SCH 80
Piping, Plastic
ASTM F891-2016 Standard Specification for Coextruded Poly(Vinyl Chloride) (PVC) Plastic Pipe with a Cellular Core
Piping, Plastic
AWS
AWS B2.2/B2.2M-2016 Brazing Procedure and Performance Qualification Certification AWWA
AWWA C507-2018 Ball Valves, 6 In. through 60 In. (150 mm Through 1,500 mm) Valves BS
HOA.105559019.8 93
BS EN 12975-1-
2006 (R2010)
Thermal Solar Systems and Components – Solar Collectors – Part 1: General Requirements
Collector
BS EN 12976-1-2021 Thermal Solar Systems and Components – Factory Made Systems – Part 1: General Requirements
Solar Thermal Systems
BS EN 12976-2-2019 Thermal Solar Systems and Components – Factory Made Systems – Part 2: Test Methods
Solar Thermal Systems
BS EN ISO 9806-2017 Solar Energy – Solar Thermal Collectors – Test Methods Collector BS EN ISO 9488-2022 Solar Energy – Vocabulary Miscellaneous CSA
ANSI Z21.22-2015
(R2020)/CSA 4.4-
2015 (R2020)
Relief Valves for Hot Water Supply Systems Valves
CSA/ANSI Z21.24-
2022/CSA 6.10-
2022
Connectors for Gas Appliances Fuel Gas
IAPMO
IAPMO IGC 332-2017a Hydronic Radiators Hydronic Systems IAPMO IS 34-2020 Installation Standard for Residential Solar Photovoltaic and Energy Storage Systems
Solar PV Systems
IAPMO/ANSI
WE•Stand- 2020
Water Efficiency and Sanitation Standard for the Built
Environment
Water Conservation
IEEE
IEEE 937-2019 Installation and Maintenance of Lead-Acid Batteries for Photovoltaic (PV) Systems
Installation and
Maintenance,
Photovoltaic
IEEE 1013-2019 Sizing Lead-Acid Batteries for Stand-Alone Photovoltaic (PV) Systems
Photovoltaic, Sizing
IEEE 1361-2014 Selecting, Charging, Testing, and Evaluating Lead-Acid Batteries Used in Stand-Alone Photovoltaic (PV) Systems Testing, Evaluation
IEEE 1526-2020 IEEE Recommended Practice for Testing the Performance of Stand-Alone Photovoltaic Systems
Testing, Photovoltaic
IEEE 1547-2018 Interconnection and Interoperability of Distributed Energy Resources with Associated Electric Power Systems Interfaces Connections,
Photovoltaic
IEEE 1562-2021 Sizing of Stand-Alone Photovoltaic (PV) Systems Array, Battery, Photovoltaic
IEEE 1661-2019 Test and Evaluation of Lead-Acid Batteries Used in Photovoltaic (PV) Hybrid Power Systems
Testing and Evaluation,
Photovoltaic
MSS
MSS SP-58-2018 Pipe Hangers and Supports – Materials, Design, Manufacture, Selection, Application, and Installation (including Amendment 1, dated October 17, 2019)
Fuel Gas
MSS SP-80-2019 Bronze Gate, Globe, Angle, and Check Valves Valves NEMA
ANSI/NEMA 250-2020 Enclosures for Electrical Equipment (1000 Volts Maximum) Electrical NFPA
NFPA 13D-2022 Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes
Fire Safety
NFPA 54/Z223.1-2021 National Fuel Gas Code Fuel Gas
NFPA 70E-2021 Electrical Safety in the Workplace Electrical Safety NFPA 274-2018 Standard Test Method to Evaluate Fire Performance Characteristics of Pipe Insulation
Pipe Insulation
HOA.105559019.8 94
NSF
NSF/ANSI 14-2022 Plastics Piping System Components and Related Materials Piping, Plastic UL
UL 174-2004 Household Electric Storage Tank Water Heaters (with revisions through December 16, 2021)
Appliances
UL 916-2015 Energy Management Equipment (with revisions through October 21, 2021)
Electrical
UL 1453-2016 Electric Booster and Commercial Storage Tank Water Heaters (with revisions through May 18, 2018)
Appliances
UL 60730-1 2016 Automatic Electrical Controls – Part 1: General Requirements (with revisions through October 18, 2021)
Electrical
SECTION 31. Abbreviations in Table S 18.1 and Table S 18.2 are amended to read as follows:
ABBREVIATIONS IN TABLE SU 18.1 AND TABLE SU 18.2
AHRI
ANSI
ASHRAE
Air-Conditioning, Heating, and Refrigeration Institute, 2311 Wilson Boulevard, Suite 400, Arlington, VA22201. American National Standards Institute, Inc., 25 W. 43rd Street, 4th Floor, New York, NY 10036.
American Society of Heating, Refrigerating and Air Conditioning Engineers, Inc., 1791 Tullie Circle, NE,
Atlanta, GA 30329-2305.
ASME American Society of Mechanical Engineers, Two Park Avenue, New York, NY 10016-5990.
ASSE American Society of Sanitary Engineering, 18927 Hickory Creek Drive, Suite 220, Mokena, IL 60448.
ASTM ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.
AWS American Welding Society, 8669 NW 36 Street, # 130, Miami, FL 33166- 6672.
AWWA American Water Works Association, 6666 W. Quincy Avenue, Denver, CO 80235.
BSI (BS EN) British Standard International, 389 Chiswick High Road, London, W4 4AL United Kingdom.
CSA Canadian Standards Association, 178 Rexdale Boulevard, Toronto, ON, Canada M9W 1R3.
e1 An editorial change since the last revision or reapproval.
IAPMO International Association of Plumbing and Mechanical Officials, 4755 E.
Philadelphia Street, Ontario, CA 91761.
ICC International Code Council, 500 New Jersey Avenue, NW, 6th Floor, Washington, DC 20001.
HOA.105559019.8 95
IEEE The Institute of Electrical and Electronics Engineers, Inc., 3 Park Avenue, 17th Floor, New York, NY 10016-5997.
MSS Manufacturers Standardization Society of the Valve and Fittings Industry, 127 Park Street NE, Vienna, VA 22180.
NFPA National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02169-7471.
NGWA National Ground Water Association, 601 Dempsey Road, Westerville, OH 43081.
NSF NSF International, 789 N. Dixboro Road, Ann Arbor, MI 48105.
SRCC Solar Rating and Certification Corporation, 3060 Saturn Street, Suite 100, Brea, CA 92821.
UL Underwriters Laboratories, Inc., 333 Pfingsten Road, Northbrook, IL 60062.
AHRI Air-Conditioning, Heating, and Refrigeration Institute, 2311 Wilson Boulevard, Suite 400, Arlington, VA 22201.
ANSI American National Standards Institute, Inc., 25 W. 43rd Street, 4th Floor, New York, NY 10036.
ASHRAE American Society of Heating, Refrigerating and Air Conditioning Engineers, Inc., 1791 Tullie Circle, NE, Atlanta, GA 30329-2305.
ASME American Society of Mechanical Engineers, Two Park Avenue, New York, NY 10016-5990.
ASSE American Society of Sanitary Engineering, 18927 Hickory Creek Drive, Suite 220, Mokena, IL 60448.
ASTM ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428- 2959.
AWS American Welding Society, 8669 NW 36 Street, # 130, Miami, FL 33166-6672.
AWWA American Water Works Association, 6666 W. Quincy Avenue, Denver, CO 80235.
BSI (BS EN) British Standard International, 12950 Worldgate Drive, Suite 800 Herndon, VA 20170.
CSA Canadian Standards Association, 178 Rexdale Boulevard, Toronto, ON, Canada M9W 1R3.
IAPMO International Association of Plumbing and Mechanical Officials, 4755 E.
Philadelphia Street, Ontario, CA 91761.
ICC International Code Council, 500 New Jersey Avenue, NW, 6th Floor, Washington, DC 20001.
IEEE The Institute of Electrical and Electronics Engineers, Inc., 445 and 501 Hoes Lane, Piscataway, NJ 08854.
IGSHPA International Ground Source Heat Pump Association, 312 S. 4th Street, Suite 100, Springfield, IL 62701.
ISO International Organization for Standardization, Chemin de Blandonnet 8, CP 401 - 1214 Vernier, Geneva, Switzerland.
HOA.105559019.8 96
MSS Manufacturers Standardization Society of the Valve and Fittings Industry, 127 Park Street NE, Vienna, VA 22180.
NEMANational Electrical Manufacturers Association, 1300 N. 17th Street, Suite 900, Rosslyn, VA 22209.
NFPA National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02169- 7471.
NGWA National Ground Water Association, 601 Dempsey Road, Westerville, OH 43081.
NSF NSF International, 789 N. Dixboro Road, Ann Arbor, MI 48105.
SRCC Solar Rating and Certification Corporation, 3060 Saturn Street, Suite 100, Brea, CA 92821.
UL Underwriters Laboratories, Inc., 333 Pfingsten Road, Northbrook, IL 60062.
SECTION 32. The provisions of this ordinance contain various changes, modifications, and additions to the 2025 California Plumbing Code. Some of those changes are administrative in nature in that they do not constitute changes or modifications to requirements contained in the building standards published in the California Building Standards Code.
Pursuant to California Health and Safety Code sections 17958.5, 17958.7, and 18941.5, the Board of Supervisors hereby expressly finds that all of the changes and modifications to requirements contained in the building standards published in the California Building Standards Code that are contained in this ordinance are reasonably necessary because of local climatic, geological, or topographical conditions in the County of Los Angeles due to the potential for seismic activity in the region, topographical conditions that contribute to the spread of wild fires, and climatic conditions that impact air quality, water conservation and increased wild fire risk. In addition, the Board of Supervisors expressly finds that the modifications herein are substantially equivalent to modifications that were previously filed by the County of Los Angeles and were in effect as of September 30, 2025. Without limiting the foregoing,
HOA.105559019.8 97
the County makes additional findings herein:
PLUMBING CODE AMENDMENTS
CODE SECTION CONDITION EXPLANATION
Section 304.1 Geological
Topographical
Climatic
The County of Los Angeles is a densely
populated area with buildings constructed
within a region where water is scarce and
domestic water service is impacted by
immoderate and varying weather conditions,
including periods of extended drought. The
proposed measures will require buildings to
be more water efficient and allow greater
conservation of domestic water due to these
local conditions.
Sections 601.2.3 Geological
Topographical
Climatic
The County of Los Angeles is a densely
populated area with buildings constructed
within a region where water is scarce and
domestic water service is impacted by
immoderate and varying weather conditions,
including periods of extended drought. The
proposed measures will require buildings to
be more water efficient and allow greater
conservation of domestic water due to these
local conditions.
Section 721.3 Geological
Topographical
To allow for the proper operation of existing
Los Angeles County sewer infrastructure and
establish consistency with Title 20 – Utilities –
of the Los Angeles County Code, Division 2
(Sanitary Sewers and Industrial Waste) due
to local soil conditions and topography.
Sections 728.1 to
728.6
Geological
Topographical
To allow for the proper operation of existing
Los Angeles County sewer infrastructure and
establish consistency with Title 20 – Utilities –
of the Los Angeles County Code, Division 2
(Sanitary Sewers and Industrial Waste) due
to local soil conditions and topography.
HOA.105559019.8 98
Table H 101.8 Geological
Topographical
To establish more restrictive requirements for
protection of local groundwater due to local
soil conditions and to provide protections for
native, protected oak trees that are consistent
with Title 22 – Zoning and Planning – of the
Los Angeles County Code, Chapter 22.174
(Oak Tree Permits).
Table H 201.1(1) Geological
Topographical
To establish more restrictive requirements for
protection of local groundwater due to local
soil conditions, sewer capacity, and sewage
treatment.
Table H 201.1(2) Geological
Topographical
To establish consistency with requirements of
the County Health Department for sewer
capacity and sewage treatment due to local
soil conditions.
Table H 201.1(3) Geological
Topographical
To establish consistency with requirements of
the County Health Department for sewer
capacity and sewage treatment due to local
soil conditions.
Table H 201.1(4) Geological
Topographical
To establish consistency with requirements of
the County Health Department for sewer
capacity and sewage treatment due to local
soil conditions.
Section H 301.1 Geological
Topographical
To establish more restrictive requirements for
protection of local groundwater due to local
soil conditions.
Section H 401.3 Geological
Topographical
To establish more restrictive requirements for
protection of local groundwater due to local
soil conditions.
Section H 601.5 Geological
Topographical
To establish more restrictive requirements for
protection of local groundwater due to local
soil conditions.
Section H 601.8 Geological
Topographical
To establish more restrictive requirements for
protection of local groundwater due to local
soil conditions.
Section H 701.2 Geological
Topographical
To establish more restrictive requirements for
protection of local groundwater due to local
soil conditions.
HOA.105559019.8 99
Section H 1001.1 Geological To establish more restrictive requirements to prevent earth movement based on local soil
and seismic conditions.
Section H 1101.6 Geological To establish more restrictive requirements to prevent earth movement based on local soil
and seismic conditions.
Appendix T Climatic and
Topographical
To establish requirements for conservation
and disposal of swimming pool water to
minimize evaporation and topographical
impacts.
Appendix U Climatic To establish requirements for solar thermal energy systems based on provisions in the
Uniform Solar, Hydronics and Geothermal
Code (USHGC), which is developed by the
International Association of Plumbing and
Mechanical Officials. The County of Los
Angeles is a densely populated area, with
elevated levels of greenhouse gas emissions.
Standards to regulate the installation of solar
thermal energy systems will facilitate safe
and efficient installations of these systems to
improve local air quality, thereby improving
the health of the County's residents,
businesses and visitors.
SECTION 33. This ordinance shall become operative on January 1, 2026. [TITLE28PLUMBCODE2025CSCC]
SECTION 34. This ordinance shall be published in The Daily Commerce a newspaper printed and published in the County of Los Angeles.
Chair
ATTEST:
Edward Yen
Executive Officer -
Clerk of the Board of Supervisors
County of Los Angeles
I hereby certify that at its meeting
of November 25, 2025
the foregoing
ordinance was adopted by the Board of Supervisors of said County of Los Angeles by the following vote, to wit:
Ayes Noes
Supervisors Hilda L. Solis Supervisors None
Holly J. Mitchell
Lindsey P. Horvath
Janice Hahn
Kathryn Barger
Effective Date: December 26, 2025
Operative Date: January 1, 2026 Edward Yen
Executive Officer -
Clerk of the Board of Supervisors
County of Los Angeles
APPROVED AS TO FORM:
DAWYN R. HARRISON
County Counsel
By
Nicole Davis Tinkham
Chief Deputy County Counsel
HOA.105559019.8 2
S:\Ordinances\County Counsel\2025\2025-0049
HOA.105518232.11
ANALYSIS
This ordinance repeals those provisions of Title 29 – Mechanical Code – of the Los Angeles County Code that incorporated by reference portions of the 2022 California Mechanical Code and replaces them with provisions incorporating by reference portions of the 2025 California Mechanical Code, published by the California Building Standards Commission. Unless deleted or modified herein, the previously enacted provisions of Title 29 continue in effect.
State law requires that the County's Mechanical Code impose the same requirements as are contained in the building standards published in the most recent edition of the California Mechanical Code except for changes or modifications deemed reasonably necessary by the County because of local climatic, geological, or topographical conditions. The changes and modifications to the requirements contained in the building standards published in the 2025 California Mechanical Code that are contained in this ordinance are based upon express findings, contained in the ordinance, that such changes are reasonably necessary due to local climatic, geological, or topographical conditions. These changes and modifications are substantially equivalent to changes and modifications previously filed by the County of Los Angeles, which were in effect as of September 30, 2025.
This ordinance also makes certain modifications to the administrative provisions of Title 29.
DAWYN R. HARRISON
County Counsel
By
Margaret F. Ambrose
Principal Deputy County Counsel
Public Works Division
MFA:bc
Requested: 8/5/25
Revised: 10/8/25
Attachment B Page 300 of 441
ORDINANCE NO. 2025-0050
An ordinance amending Title 29 – Mechanical Code – of the Los Angeles County Code by adopting and incorporating by reference portions of the 2025 California Mechanical Code with certain changes and modifications and making other revisions thereto.
The Board of Supervisors of the County of Los Angeles ordains as follows:
SECTION 1. Sections 119.1.2.0 through 119.1.14.0 of Chapter 1, Chapters 2 through 17, and Appendices B, C, and D, of this Title 29 of the Los Angeles County Code, which incorporated by reference and modified portions of the 2022 California Mechanical Code, are hereby repealed.
SECTION 2. Section 100 is hereby amended to read as follows:
100 ADOPTION AND INCORPORATION BY REFERENCE.
Except as hereinafter changed or modified, Sections 1.2.0 through 1.14.0 of Chapter 1, Division I, of that certain Mechanical Code known and designated as the 20222025 California Mechanical Code, as published by the California Building Standards Commission, are adopted and incorporated by reference into this Title 29 of the Los Angeles County Code, as if fully set forth below, and shall be known as Sections 119.1.2.0 through 119.1.14.0, respectively, of Chapter 1 of Title 29 of the Los Angeles County Code.
Except as hereinafter changed or modified, Chapters 2 through 17, and Appendices B, C, and D, of that certain Mechanical Code known and designated as the 20222025 California Mechanical Code, as published by the California Building
HOA.105518232.11 2
Standards Commission, are adopted and incorporated by reference into this Title 29 of the Los Angeles County Code as if fully set forth below, and shall be known as Chapters 2 through 17, and Appendices B, C, and D, of Title 29 of the Los Angeles County Code.
A copy of the 20222025 California Mechanical Code shall be at all times maintained by the Chief Mechanical Inspector for use and examination by the public.
SECTION 3. Section 204.0 is hereby amended to read as follows:
204.0 – B –
. . .
Building Code. The building code that is adopted by this jurisdiction. [HCD1, HCD 2, OSHPD 1, 1R, 2, 3, 4, 5, 6 & SFM] "Building Code" shall mean the California Building Code, Title 24, Part 2most recent edition of Title 26 of the Los Angeles County Code.
. . .
SECTION 4. Section 207.0 is hereby amended to read as follows:
207.0 – E –
. . .
Electrical Code. The "Electrical Code" shall mean the National Electrical Code promulgated by the National Fire Protection Association, as adopted by this jurisdiction. [HCD 1 & HCD 2] Whenever the term "Electrical Code" is used in this code, it shall mean the California Electrical Code, Title 24, Part 3most recent edition of Title 27 of the Los Angeles County Code.
HOA.105518232.11 3
. . .
SECTION 5. Section 218.0 is hereby amended to read as follows:
218.0 – P –
. . .
Plumbing Code. The "Plumbing Code" shall mean the Uniform Plumbing Code (UPC) promulgated by the International Association of Plumbing and Mechanical Officials (IAPMO), as adopted by this jurisdiction. [HCD 1 & HCD 2] Whenever the term "Plumbing Code" is used in this code, it shall mean the California Plumbing Code, Title 24, Part 5most recent edition of Title 28 of the Los Angeles County Code. . . .
SECTION 6. Section 302.2 is hereby amended to read as follows:
302.2 ALTERNATE MATERIALS AND METHODS OF
CONSTRUCTION EQUIVALENCYAND MODIFICATIONS.
302.2.1 Alternate Materials and Methods of Construction.
Nothing in this cCode is intended to prevent the use of systems, methods, or devices of equivalent or superior quality, strength, fire resistance, effectiveness, durability, and safety over those prescribed by this cCode. Technical documentation shall be submitted to the Authority Having Jurisdiction to demonstrate equivalency. The Authority Having Jurisdiction shall have the authority to approve or disapprove the system, method, or device for the intended purpose on a case-by-case basis. . . .
HOA.105518232.11 4
302.2.1.1 Testing.
. . .
302.2.1.1.1 Tests.
. . .
302.2.1.21.2 Requests by the Authority Having Jurisdiction. . . .
302.2.1.2 Application. Application for the use of an alternate material or method of construction shall be submitted in writing to the Chief Mechanical Inspector together with a filing fee of $317.26. When staff review exceeds two hours, an additional fee of $158.63 per hour shall be charged for each hour, or fraction thereof, in excess of two hours.
302.2.2 Modifications. Whenever there are practical difficulties involved in carrying out the provisions of this Code, the Authority Having Jurisdiction shall have the authority to grant modifications on a case-by-case basis, upon application of the owner or the owner's authorized agent, provided that the Authority Having Jurisdiction shall first find that a special individual reason makes the strict letter of this Code impractical, and that the modification is in conformity with the spirit and purpose of this Code, and that such modification does not lessen any health, fire-protection, or other life-safety-related requirements. The details of any action granting modifications shall be recorded and entered in the files of the Authority Having Jurisdiction. The application for approval of a modification shall be in accordance with Section 302.2.1.2.
HOA.105518232.11 5
SECTION 7. Section 501.1 is hereby amended to read as follows:
501.1 Applicability. This cChapter includes requirements for environmental air ducts, product-conveying systems, and commercial hoods and kitchen ventilation. Part I addresses environmental air ducts and product-conveying systems. Part II addresses commercial hoods and kitchen ventilation. Ventilation systems installed to control occupational health hazards shall comply with the requirements of the County Health Officer as defined in Title 11 of the Los Angeles County Code.
SECTION 8. Section 510.1.6 is hereby amended to read as follows:
510.1.6 Bracing and Supports. Duct bracing and supports shall be of noncombustible material, securely attached to the structure, not less than the gauge required for grease-duct construction, and designed to carry gravity and lateral loads within the stress limitations of the bBuilding cCode. Bolts, screws, rivets, and other mechanical fasteners shall not penetrate duct walls.
SECTION 9. Section 603.7.1.1 is hereby amended to read as follows:
603.7.1.1 Rectangular Ducts. Supports for rectangular ducts shall be installed on two opposite sides of each duct and shall be welded, riveted, bolted, or metal screwed to each side of the duct at intervals specified.
HOA.105518232.11 6
SECTION 10. Section 1114.4 is hereby added to read as follows:
1114.4 Approvals Required. The method of discharge of systems containing other than group A1 refrigerants shall comply with the pertinent requirements of Title 32 (Fire Code) and Division 2 of Title 20 (Sanitary Sewer and Industrial Waste) o f the Los Angeles County Code.
SECTION 11. The provisions of this ordinance contain various changes, modifications, and additions to the 2025 Edition of the California Mechanical Code.
Some of these changes are administrative in nature in that they do not constitute changes or modifications to requirements contained in the building standards published in the California Mechanical Code.
Pursuant to California Health and Safety Code sections 17958.5, 17958.7, and 18941.5, the Board of Supervisors hereby expressly finds that all of the changes and modifications to requirements contained in the building standards published in the California Building Standards Code contained in this ordinance are reasonably necessary because of local climatic, geological, or topographical conditions in the County of Los Angeles due to the potential for seismic activity in the region, topographical conditions that contribute to the spread of wild fires, and climatic conditions that impact air quality and increase the risk of wild fires. In addition, the Board of Supervisors expressly finds that the modifications herein are substantially equivalent to modifications that were previously filed by the County of Los Angeles and were in effect as of September 30, 2025. Without limiting the foregoing, the County makes additional findings herein:
HOA.105518232.11 7
TABLE
MECHANICAL CODE AMENDMENTS
CODE SECTION CONDITION EXPLANATION
501.1 Climatic Additional Health
Department requirements
are necessary due to local
air quality concerns.
510.1.6 Geological High geologic activities,
such as seismic events, in
the Southern California area
necessitate this local
amendment for bracing and
support.
603.7.1.1 Geological High geologic activities,
such as seismic events, in
the Southern California area
necessitate this local
amendment for bracing and
support.
1114.4 Geological High geologic activities,
such as seismic events, in
the Southern California area
necessitate this local
amendment to reduce
damage and potential for
toxic refrigerant release
during a seismic event
caused by shifting
equipment and to minimize
impacts to the sewer
system in such an event.
SECTION 12. This ordinance shall become operative on January 1, 2026. [TITLE29MECHCODE2025CSCC]
SECTION 13. This ordinance shall be published in The Daily Commerce a newspaper printed and published in the County of Los Angeles.
Chair
ATTEST:
Edward Yen
Executive Officer -
Clerk of the Board of Supervisors
County of Los Angeles
I hereby certify that at its meeting of November 25, 2025 the foregoing ordinance was adopted by the Board of Supervisors of said County of Los Angeles by the following vote, to wit:
Ayes Noes
Supervisors Hilda L. Solis Supervisors None
Holly J. Mitchell
Lindsey P. Horvath
Janice Hahn
Kathryn Barger
Effective Date: December 26, 2025
Operative
Date: January 6, 2026
Edward Yen
Executive Officer -
Clerk of the Board of Supervisors
County of Los Angeles
APPROVED AS TO FORM:
DAWYN R. HARRISON
County Counsel
By
Nicole Davis Tinkham
Chief Deputy County Counsel
S:\Ordinances\County Counsel\2025\2025-0050
HOA.105522003.7
ANALYSIS
This ordinance repeals those provisions of Title 30 – Residential Code – of the Los Angeles County Code that incorporated by reference portions of the 2022 Edition of the California Residential Code, and the ordinance replaces them with provisions incorporating by reference portions of the 2025 California Residential Code, published by the California Building Standards Commission, with certain changes and modifications.
State law requires that the County adopt ordinances that contain the same requirements as are contained in the building standards published in the California Residential Code. State law allows the County to change or modify these requirements in compliance with section 17958 of the California Health and Safety Code.
The changes and modifications to requirements contained in the building standards published in the 2025 California Residential Code that are contained in this ordinance are based upon express findings, contained in the ordinance, that such changes are reasonably necessary due to local climatic, geological, or topographical conditions. These changes and modifications are substantially equivalent to changes or modifications previously filed with the California Building Standards Commission by the County of Los Angeles, which were in effect as of September 30, 2025, or that relate to home hardening, in compliance with recent changes to section 17958 of the California Health and Safety Code.
DAWYN R. HARRISON
County Counsel
By
MARGARET F. AMBROSE
Principal Deputy County Counsel
MFA/CBS:bc
Requested: 08/04/25
Revised: 10/22/25
Attachment B Page 309 of 441
ORDINANCE NO. 2025-0051
An ordinance amending Title 30 – Residential Code – of the Los Angeles County Code, by adopting and incorporating by reference the 2025 California Residential Code, with certain changes and modifications.
The Board of Supervisors of the County of Los Angeles ordains as follows:
SECTION 1. Chapters 2 through 10, Chapter 44, and Appendices AH, A Q, AS, and AZ, of Title 30 of the Los Angeles County Code, which incorporate by reference, and modify, portions of the 2022 California Residential Code, are hereby repealed.
SECTION 2. Chapter 1 is hereby amended to read as follows:
R100 ADOPTION AND INCORPORATION BY REFERENCE
Except as hereinafter changed or modified, Sections 102 through 119 of Chapter 1, Section 1206 of Chapter 12, and Chapters 67, 68, 69, 98, 99, and Appendix J, of Title 26 of the Los Angeles County Code are adopted and incorporated by reference into this Title 30 as if fully set forth below, and shall be known as Sections 102 through 119 of Chapter 1, Section 1206 of Chapter 12, and Chapters 67, 68, 69, 98, 99, and Appendix J, of Title 30 of the Los Angeles County Code.
Except as hereinafter changed or modified, Chapters 2 through 10, Chapter 44, and Appendices AH, AQ, AS, and AZBB, BF, BJ, and CJ, of that certain code known and designated as the 20222025 California Residential Code, as published by the California Building Standards Commission, are adopted and incorporated by reference into this Title 30 as if fully set forth below, and shall be known as Chapters 2 through 10,
HOA.105522003.7 2
Chapter 44, and Appendices AH, AQ, AS, and AZBB, BF, BJ, and CJ, of Title 30 of the Los Angeles County Code. A copy of the 20222025 California Residential Code shall be at all times maintained by the Building Official for use and examination by the public.
R101 TITLE, PURPOSE, AND INTENT
. . .
R101.3 Scope.
The provisions of this Code shall apply to the construction, alteration, movement, enlargement, replacement, repair, equipment, use and occupancy, location, removal, demolition, and grading of detached one- and two-family dwellings and townhouses not more than three stories above grade plane in height with a separate means of egress and their accessory structures that are located within the unincorporated territory of the County of Los Angeles and to such work or use by the County of Los Angeles in any incorporated city.
Exceptions:
. . .
2. Owner-occupied lodging houses with five or fewer guestrooms shall be permitted to be constructed in accordance with the Los Angeles County Residential Code for one- and two-family dwellings when equipped with a fire sprinkler system in accordance with Section R313R309.
. . .
HOA.105522003.7 3
SECTION 3. Section R301.1.3.2 is hereby amended to read as follows:
R301.1.3.2 Woodframe structures greater than two-stories.
The bBuilding oOfficial shall require construction documents to be approved and stamped by a California licensed architect or engineer for all dwellings of woodframe construction more than two stories and basement in height located in Seismic Design Category A, B, or C. Notwithstanding other sections of law, the law establishing these provisions is found in Business and Professions Code Sections 5537 and 6737.1.
The Building Official shall require construction documents to be approved and stamped by a California licensed architect or engineer for all structural aspects of dwellings of woodframe construction more than one story in height or with a basement located in Seismic Design Category D 0 , D 1 , or D 2 or E.
SECTION 4. Section R301.1.5 is hereby added to read as follows:
R301.1.5 Seismic design provisions for buildings constructed on or into slopes steeper than one unit vertical in three units horizontal (33.3 percent slope).
The design and construction of new buildings and additions to existing buildings when constructed on or into slopes steeper than one unit vertical in three units horizontal (33.3 percent slope) shall comply with Section 1613.6 of the Los Angeles County Building Code.
HOA.105522003.7 4
SECTION 5. Section R301.2 is hereby amended to read as follows:
R301.2 Climatic and geographic design criteria.
Buildings shall be constructed in accordance with the provisions of this cCode as limited by the provisions of this sSection. Additional criteria shall be established by the local jurisdiction and set forthConsult with the Building Official regarding additional criteria in Table R301.2.
SECTION 6. Section R301.2.2.6 is hereby amended to read as follows:
R301.2.2.6 Irregular buildings.
. . .
1. Shear wall or braced wall offsets out of plane. Conditions where exterior shear wall lines or braced wall panels are not in one plane vertically from the foundation to the uppermost story in which they are required.
Exception: For wood light-frame construction, floors with cantilevers or setbacks not exceeding four times the nominal depth of the wood floor joists are permitted to support braced wall panels that are out of plane with braced wall panels below provided that all of the following are satisfied:
1. Floor joists are nominal 2 inches by 10 inches (51 mm by 254 mm) or larger and spaced not more than 16 inches (406 mm) on center.
2. The ratio of the back span to the cantilever is not less than 2 to 1.
3. Floor joists at ends of braced wall panels are doubled.
4. For wood-frame construction, a continuous rim joist is connected to ends of cantilever joists. Where spliced, the rim joists shall be spliced using a galvanized
HOA.105522003.7 5
metal tie not less than 0.058 inch (1.5 mm) (16 gage) and 11/2 inches (38 mm) wide fastened with six 16d nails on each side of the splice; or a block of the same size as the rim joist and of sufficient length to fit securely between the joist space at which the splice occurs, fastened with eight 16d nails on each side of the splice.
5. Gravity loads carried at the end of cantilevered joists are limited to uniform wall and roof loads and the reactions from headers having a span of 8 feet (2438 mm) or less.
2. Lateral support of roofs and floors. Conditions where a section of floor or roof is not laterally supported by shear walls or braced wall lines on all edges.
Exception: Portions of floors that do not support shear walls, braced wall panels above, or roofs shall be permitted to extend not more than 6 feet (1829 mm) beyond a shear wall or braced wall line.
3. Shear wall or braced wall offsets in plane. Conditions where the end of a braced wall panel occurs over an opening in the wall below and extends more than 1 foot (305 mm) horizontally past the edge of the opening. This provision is applicable to shear walls and braced wall panels offset in plane and to braced wall panels offset out of plane in accordance with the exception to Item 1.
Exception: For wood light-frame wall construction, one end of a braced wall panel shall be permitted to extend more than 1 foot (305 mm) over an opening not more than 8 feet (2438 mm) in width in the wall below provided that the opening includes a header in accordance with all of the following:
HOA.105522003.7 6
1. The building width, loading condition and framing member species limitations of Table R602.7(1) shall apply.
2. The header is composed of:
2.1 Not less than one 2x12 or two 2x10 for an opening not more than 4 feet (1219 mm) wide.
2.2. Not less than two 2x12 or three 2x10 for an opening not more than 6 feet (1829 mm) in width.
2.3. Not less than three 2x12 or four 2x10 for an opening not more than 8 feet (2438 mm) in width.
3. The entire length of the braced wall panel does not occur over an opening in the wall below.
4. Floor and roof opening. Conditions where an opening in a floor or roof exceeds the lesser of 12 feet (3658 mm) or 50 percent of the least floor or roof dimension.
5. Floor level offset. Conditions where portions of a floor level are vertically offset.
Exceptions:
1. Framing supported directly by continuous foundations at the perimeter of the building.
2. For wood light-frame construction, floors shall be permitted to be vertically offset where the floor framing is lapped or tied together as required by section R502.6.1. . . .
HOA.105522003.7 7
SECTION 7. Section R301.2.2.11 is hereby added to read as follows:
R301.2.2.11 Anchorage of mechanical, electrical, or plumbing components and equipment.
Mechanical, electrical, or plumbing components and equipment shall be anchored to the structure. Anchorage of the components and equipment shall be designed to resist loads in accordance with the Los Angeles County Building Code and ASCE 7, except where the component is positively attached to the structure and flexible connections are provided between the component and associated ductwork, piping, and conduit; and either:
1. The component weighs 400 pounds (1,780 N) or less and has a center of mass located 4 feet (1.22 m) or less above the supporting structure; or
2. The component weighs 20 pounds (89N) or less or, in the case of a distributed system, 5 pounds per foot (73 N/m) or less.
HOA.105522003.7 8
SECTION 8. Table R302.1(2) is hereby amended to read as follows:
For SI: 1 foot = 304.8 mm
NA = Not Applicable.
a. Reserved.For residential subdivisions where all dwellings and townhouses are equipped throughout with an automatic sprinkler system installed in accordance with Section R309, the fire separation distance for exterior walls not fire-resistance rated and for fire-resistance-rated projections shall be permitted to be reduced to 0 feet, and unlimited unprotected openings and penetrations shall be permitted, where the adjoining lot provides an open setback yard that is 6 feet or more in width on the opposite side of the property line. . . .
HOA.105522003.7 9
SECTION 9. Section R337.1 is hereby added to read as follows:
R337.1 Modifications to the California Wildland-Urban Interface Code.
Chapter 5 of the California Wildland-Urban Interface Code shall be modified as indicated in Sections 337.1.1 through 337.1.7 and shall apply to all buildings and structures as provided in this section.
SECTION 10. Section R337.1.1 is hereby added to read as follows:
337.1.1 California Wildland-Urban Interface Code, Section 501.1.
Modify the California Wildland-Urban Interface Code Section 501.1 to read as follows:
501.1 Scope and Application.
New bBuildings and structures in a wildland-urban interface area shall be constructed in accordance with the California Building Residential Code and this Code.
Additions, alterations, or repairs made to existing buildings erected, constructed, or moved within a Fire Hazard Severity Zone or Wildland-Urban Interface area shall be constructed in accordance with the Residential Code and this code. New buildings for which an application for a building permit is submitted on or after July 1, 2008, and any additions, alterations, or repairs made to existing buildings for which an application for a building permit is submitted on or after January 1, 2026, located in any Fire Hazard Severity Zone or Wildland-Urban Interface area shall comply with all sections of the Residential Code and this Code.
HOA.105522003.7 10
Exceptions:
1. Group U accessory structures not exceeding 120 square feet (11m 2 ) in floor area where located not less than 50 feet (15 240 mm) from applicable buildings.
2. Group U agricultural buildings not less than 50 feet (15 240 mm) from applicable buildings.
501.1.1 Alternates for materials, design, tests, and methods of construction.
The Building Official is permitted to modify the provisions of this Chapter for sitespecific conditions in accordance with Chapter 1, Section 104.2.2 of the California Wildland-Urban Interface Code.
SECTION 11. Section R337.1.2 is hereby added to read as follows:
337.1.2 California Wildland-Urban Interface Code, Section 503.1 Modify the California Wildland-Urban Interface Code Section 503.1 to read as follows:
503.1 General.
Buildings and structures hereafter constructed, modified or relocated into or within wildland-urban interface areas shall meet the construction requirements in accordance with Chapter 5. Materials required to be ignition-resistant building materials shall comply with the requirements of Section 503.2.
HOA.105522003.7 11
Exceptions:
1. New accessory buildings and miscellaneous structures complying with Section 504.11.
2. Reserved.Additions to and remodels of buildings originally constructed prior to July 1, 2008.
3. Group C occupancy special buildings conforming to the limitations specified in Section 450.4.1 of the California Building Code.
SECTION 12. Section R337.1.3 is hereby added to read as follows:
337.1.3 California Wildland-Urban Interface Code, Section 503.2.3
Modify the California Wildland-Urban Interface Code Section 503.2.3 to read as follows:
503.2.3 Reserved.Fire-retardant-treated wood roof coverings.
Roof assemblies containing fire-retardant-treated wood shingles and shakes shall comply with the requirements of Section 1505.6 of the California Building Code and shall be classified as Class A roof assemblies as required in Section 1505.2 of the California Building Code.
SECTION 13. Section R337.1.4 is hereby added to read as follows:
337.1.4 California Wildland-Urban Interface Code, Section 503.3.1
Modify the California Wildland-Urban Interface Code Section 503.3.1 to read as follows:
HOA.105522003.7 12
503.3.1 Qualification by testing.
Material and material assemblies tested in accordance with the requirements of Section 503 shall be accepted for use when the results and conditions of those tests are met. Product evaluation testing of material and material assemblies shall be approved or listed by the State Fire Marshal, the Building Official, or identified in a current report issued by an approved agency.
SECTION 14. Section R337.1.5 is hereby added to read as follows:
337.1.5 California Wildland-Urban Interface Code, Section 503.3.4
Modify the California Wildland-Urban Interface Code Section 503.3.4 to read as follows:
503.3.4 Reserved.Fire-retardant-treated wood shingles and shakes.
Fire-retardant-treated wood shingles and shakes shall be approved and listed by the State Fire Marshal in accordance with Section 208(c), Title 19 California Code of Regulations.
SECTION 15. Section R337.1.6 is hereby added to read as follows:
337.1.6 California Wildland-Urban Interface Code, Section 504.2.1
Modify the California Wildland-Urban Interface Code Section 504.2.1 to read as follows:
HOA.105522003.7 13
504.2.1 Roof covering voids.
Where there is a void under the roof covering it shall comply with Section 504.2.1.1 or 504.2.1.2. Roof coverings shall be Class A as specified in the Building Code. Wood shingles and wood shakes are prohibited in any Fire Hazard Severity Zone regardless of classification.
SECTION 16. Section R337.1.7 is hereby added to read as follows:
337.1.7 California Wildland-Urban Interface Code, Section 504.5.2
Modify the California Wildland-Urban Interface Code Section 504.5.2 to read as follows:
504.5.2 Exterior wall coverings.
Exterior wall coverings shall comply with one or more of the following requirements:
1. Noncombustible material.
2. Ignition-resistant building material labeled for exterior use.
3. Fire-retardant treated wood labeled for exterior use and complying with the requirements of Section 2303.2 of the California Building Code.
4. Reserved.Fire-retardant-treated wood shingles and shakes which have been qualified in accordance with Section 1505.6 of the California Building Code for use as “Class B” roof covering shall be an acceptable alternative wall covering material where installed over solid sheathing.
HOA.105522003.7 14
Exception:
Exterior wall coverings which are a component of an approved wall assembly complying with Section 504.5.
SECTION 17. Section R401.1 is hereby amended to read as follows:
R401.1 Application.
. . .
Wood foundations in Seismic Design Category D 0 , D 1 , or D 2 shall be designed in accordance with accepted engineering practicenot be permitted.
Exception: In non-occupied, single-story, detached storage sheds and similar uses other than carport or garage, provided the gross floor area does not exceed 200 square feet, the plate height does not exceed 12 feet in height above the grade plane at any point, and the maximum roof projection does not exceed 24 inches.
SECTION 18. Section R403.1.2 is hereby amended to read as follows:
R403.1.2 Continuous footing in seismic design categories D 0 , D 1 and D 2 .
Exterior walls and required interior braced wall panels of buildings located in Seismic Design Categories D 0 , D 1 and D 2 shall be supported by continuous solid or fully grouted masonry or concrete footings in accordance with Table R403.1.2. Other footing materials or systems shall be designed in accordance with accepted engineering practice.
HOA.105522003.7 15
SECTION 19. Section R403.1.3.6 is hereby amended to read as follows:
R403.1.3.6 Isolated concrete footings.
In detached one- and two-family dwellings located in Seismic Design Category A, B, or C that are three stories or less in height and constructed with stud bearing walls, isolated plain concrete footings supporting columns or pedestals are permitted.
SECTION 20. Section R403.1.5 is hereby amended to read as follows:
R403.1.5 Slope.
The top surface of footings shall be level. The bottom surface of footings shall not have a slope exceeding 1 unit vertical in 10 units horizontal (10-percent slope).
Footings shall be stepped where it is necessary to change the elevation of the top surface of the footings or where the slope of the bottom surface of the footings will exceed one unit vertical in 10 units horizontal (10-percent slope).
For structures located in Seismic Design Category D 0 , D 1 , or D 2 , stepped footings shall be reinforced with two No. 4 reinforcing bars. Two bars shall be located at the top and bottom of the footings as shown in Figure R403.1.5.
HOA.105522003.7 16
SECTION 21. Figure R403.1.5 is hereby added to read as follows:
HOA.105522003.7 17
SECTION 22. Section R404.2 is hereby amended to read as follows:
R404.2 Wood foundation walls.
Wood foundation walls shall be constructed in accordance with the provisions of Sections R404.2.1 through R404.2.6 and with the details shown in Figures R403.1(2) and R403.1(3). Wood foundation walls shall not be used for structures located in Seismic Design Category D 0 , D 1 , or D 2 .
SECTION 23. Section R501.2 is hereby amended to read as follows:
R501.2 Requirements.
Floor construction shall be capable of accommodating all loads in accordance with Section R301 and of transmitting the resulting loads to the supporting structural elements. Mechanical or plumbing fixtures and equipment shall be attached or anchored to the structure in accordance with Section R301.2.2.11.
SECTION 24. Section R503.2.4 is hereby added to read as follows:
R503.2.4 Openings in horizontal diaphragms.
Openings in horizontal diaphragms with a dimension perpendicular to the joist that is greater than 4 feet (1.2 m) shall be constructed in accordance with Figure R503.2.4.
HOA.105522003.7 18
SECTION 25. Figure R503.2.4 is hereby added to read as follows:
FIGURE R503.2.4
OPENING IN HORIZONTAL DIAPHRAGMS
Notes:
a. Blockings shall be provided beyond headers.
b. Metal ties not less than 0.058 inch [1.47 mm (16 galvanized gage)] by 1.5 inches (38 mm) wide with eight 16d common nails on each side of the header-joist intersection. The metal ties shall have a minimum yield of 33,000 psi (227 MPa). c. Openings in diaphragms shall be further limited in accordance with Section R301.2.2.6.
HOA.105522003.7 19
SECTION 26. Table R602.3(1) is hereby amended to read as follows:
TABLE R602.3(1) -- FASTENING SCHEDULE
. . .
a. Nails are smooth-common, box or deformed shanks except where otherwise stated. Nails used for framing and sheathing connections are carbon steel and shall have minimum average bending yield strengths as shown: 80 ksi for shank diameter of 0.192 inch (20d common nail), 90 ksi for shank diameters larger than 0.142 inch but not larger than 0.177 inch, and 100 ksi for shank diameters of 0.142 inch or less. Connections using nails and staples of other materials, such as stainless steel, shall be designed by accepted engineering practice or approved under Section R104.2.2104.2.8. Use of staples in roof, floor, subfloor, and braced wall panels shall be prohibited in Seismic Design Category D 0 , D 1 , or D 2 . . . .
SECTION 27. Table R602.3(2) is hereby amended to read as follows:
TABLE R602.3(2)
ALTERNATE ATTACHMENTS TO TABLE R602.3(1)
. . .
b. Staples shall have a minimum crown width of 7/16-inch except as noted. Use of staples in roof, floor, subfloor, and braced wall panels shall be prohibited in Seismic Design Category D 0 , D 1 , or D 2 .
. . .
SECTION 28. Section R602.3.2 is hereby amended to read as follows:
R602.3.2 Top plate.
. . .
Exception: In other than Seismic Design Category D 0 , D 1 , or D 2 , aA single top plate used as an alternative to a double top plate shall comply with the following:
. . .
HOA.105522003.7 20
SECTION 29. Table R602.3.2 is hereby amended to read as follows:
SECTION 30. Section R602.10.2.3 is hereby amended to read as follows:
R602.10.2.3 Minimum number of braced wall panels.
Braced wall lines with a length of 16 feet (4877 mm) or less shall have not less than two braced wall panels of any length or one braced wall panel equal to 48 inches (1219 mm) or more. Braced wall lines greater than 16 feet (4877 mm) shall have not less than two braced wall panels. In Seismic Design Category D 0 , D 1 , or D 2 , no braced wall panel shall have a contributing length less than 48 inches in length or as required in Section R602.10.3, whichever is greater.
HOA.105522003.7 21
SECTION 31. Table R602.10.3(3) is hereby amended to read as follows:
TABLE R602.10.3(3)
BRACING REQUIREMENTS BASED ON SEISMIC DESIGN CATEGORY
HOA.105522003.7 22
For SI: 1 inch – 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa.
NP – Not Permitted
. . .
i. Methods GB and PCP braced wall panel h/w ratio shall not exceed 1:1 in SDC D 0 , D 1 and D 2 .
Methods DWB, SFB, PBS, and HPS are not permitted in D 0 , D 1 or D 2 .
HOA.105522003.7 23
SECTION 32. Table R602.10.4 is hereby amended to read as follows:
TABLE R602.10.4
BRACING METHODS
HOA.105522003.7 24
HOA.105522003.7 25
SECTION 33. Table R602.10.5 is hereby amended to read as follows:
TABLE R602.10.5
MINIMUM LENGTH OF BRACED WALL PANELS
HOA.105522003.7 26
. . .
HOA.105522003.7 27
SECTION 34. Figure R602.10.6.1 is amended to read as follows:
HOA.105522003.7 28
SECTION 35. Figure R602.10.6.2 is hereby amended to read as follows:
HOA.105522003.7 29
SECTION 36. Figure R602.10.6.4 is hereby amended to read as follows:
HOA.105522003.7 30
SECTION 37. Section R606.4.4 is hereby amended to read as follows:
R606.4.4 Parapet walls.
Unreinforced solid masonry parapet walls shall not be less than 8 inches (203 mm) thick and their height shall not exceed four times their thickness. Unreinforced hollow unit masonry parapet walls shall be not less than 8 inches (203 mm) thick, and their height shall not exceed three times their thickness. Masonry parapet walls in areas subject to wind loads of 30 pounds per square foot (1.44 kPa), or located in Seismic Design Category D 0 , D 1 , or D 2 , or on townhouses in Seismic Design Category C shall be reinforced in accordance with Section R606.12.
SECTION 38. Section R606.12.2.2.3 is hereby amended to read as follows:
R606.12.2.2.3 Reinforcement requirements for masonry elements.
Masonry elements listed in Section R606.12.2.2.2 shall be reinforced in either the horizontal or vertical direction as shown in Figure R606.11(2) and in accordance with the following:
1. Horizontal reinforcement. Horizontal joint reinforcement shall consist of not less than two longitudinal W1.7 wires spaced not more than 16 inches (406 mm) for walls greater than 4 inches (102 mm) in width and not less than one longitudinal W1.7 wire spaced not more than 16 inches (406 mm) for walls not exceeding 4 inches (102 mm) in width; ornot less than one No. 4 bar spaced not more than 48 inches (1219 mm). Where two longitudinal wires of joint reinforcement are used, the space between these wires shall be the widest that the mortar joint will accommodate.Horizontal
HOA.105522003.7 31
reinforcement shall be provided within 16 inches (406 mm) of the top and bottom of these masonry elements.
2. Vertical reinforcement. Vertical reinforcement shall consist of not less than one No. 4 bar spaced not more than 48 inches (1219 mm). Vertical reinforcement shall be located within 168 inches (406203 mm) of the ends of masonry walls.
SECTION 39. Section R803.2.4 is hereby added to read as follows:
R803.2.4 Openings in horizontal diaphragms.
Openings in horizontal diaphragms shall conform with Section R503.2.4.
SECTION 40. Section R1001.3.1 is hereby amended to read as follows:
R1001.3.1 Vertical reinforcing.
For chimneys up to 40 inches (1016 mm) wide, four No. 4 continuous vertical bars adequately anchored into the concrete foundation shall be placed between wythes of solid masonry or within the cells of hollow unit masonry and grouted in accordance with Section R606. Grout shall be prevented from bonding with the flue liner so that the flue liner is free to move with thermal expansion. For chimneys more than 40 inches (1016 mm) wide, two additional No. 4 vertical bars adequately anchored into the concrete foundation shall be provided for each additional flue incorporated into the chimney or for each additional 40 inches (1016 mm) in width or fraction thereof.
HOA.105522003.7 32
SECTION 41. Section BJ106.1 is hereby amended to read as follows:
BJ106.1 General.
In other than Seismic Design Category D 0 , D 1 , D 2 , E, or F, pPlastered strawbale walls shall be permitted to be used as structural walls in accordance with the prescriptive provisions of this sSection.
SECTION 42. Section CJ101.1 is hereby amended to read as follows:
CJ101.1 Scope.
This appendix shall be applicableapplies to emergency housing and emergency housing facilities, as defined in Section CJ102, when and to the extent that the County of Los Angeles Board of Supervisors ("Board") finds, by motion, resolution, or otherwise, that this appendix applies to a specific state of emergency, local emergency, or declaration of shelter crisis.
SECTION 43. Section CJ102.1 is hereby amended to read as follows:
CJ102.1 General.
. . .
ENFORCING AGENCY. The Building Official as defined in Section 104.3 of this Code.
. . .
HOA.105522003.7 33
SECTION 44. Section CJ103.1 is hereby amended to read as follows:
CJ103.1 General.
Emergency sleeping cabins, emergency transportable housing units, membrane structures and tents constructed and/or assembled in accordance with this appendix, shall be occupied only during the duration of the declaration of state of emergency, local emergency, or shelter crisis.
. . .
SECTION 45. Section CJ103.4 is hereby amended to read as follows:
CJ103.4 Fire and life safety requirements not addressed in this a ppendix.
If not otherwise addressed in this appendix, fire and life safety measures, including, but not limited to, means of egress, fire separation, fire sprinklers, smoke alarms, and carbon monoxide alarms, shall be determined and enforced by the enforcing agency in consultation with the Departments of Public Health, Fire, and other pertinent County departments, as applicable.
SECTION 46. Section CJ106.1 is hereby amended to read as follows:
CJ106.1 General.
. . .
Tents and membrane structures shall be provided with means of ventilation (natural and/or mechanical) allowing for adequate air replacement, as determined by the enforcing agency.
HOA.105522003.7 34
SECTION 47. Section CJ107.1 is hereby amended to read as follows:
CJ107.1 General.
Emergency housing shall comply with the applicable requirements in the California Building Code, Chapter 11B and/or the US Access Board Final Guidelines for Emergency Transportable Housing as determined by the enforcing agency. . . .
SECTION 48. Section CJ110.1.1 is hereby added to read as follows:
CJ110.1.1 Backflow prevention.
Backflow prevention devices shall be provided in accordance with Section 602.3 of the Plumbing Code.
SECTION 49. Section CJ110.1.2 is hereby added to read as follows:
CJ110.1.2 Drinking fountains.
An adequate number of drinking fountains, bottle fillers or drinking facilities shall be provided as determined by the enforcing agency.
SECTION 50. Section CJ110.3 is hereby amended to read as follows:
CJ110.3 Toilet and bathing facilities.
. . .
The maximum travel distance from any sleeping and/or living area to the toilet facility shall not exceed 300 feet (91.4 m) or as determined by the enforcing agency.
HOA.105522003.7 35
SECTION 51. The provisions of this ordinance contain various changes, modifications, and additions to the 2025 Edition of the California Residential Code.
Some of these changes are administrative in nature in that they do not constitute changes or modifications to requirements contained in the building standards published in the California Building Standards Code.
Pursuant to California Health and Safety Code sections 17958.5, 17958.7, and 18941.5, the Board of Supervisors hereby expressly finds that all of the changes and modifications to requirements contained in the building standards published in the California Building Standards Code contained in this ordinance are reasonably necessary because of local climatic, geological, or topographical conditions in the County of Los Angeles due to the potential for seismic activity in the region, topographical conditions that contribute to the spread of wild fires, and climatic conditions that impact air quality and increase the risk of wild fires. In addition, the Board of Supervisors expressly finds that the modifications herein are substantially equivalent to modifications that were previously filed by the County of Los Angeles and were in effect as of September 30, 2025, or that relate to home hardening. Without limiting the foregoing, the County makes additional findings herein:
Code
Section
Condition Explanation of Amendment
R301.1.3.2 Geological Los Angeles County is prone to seismic activity due to the existence of active faults in the Southern
California area. After the 1994 Northridge
Earthquake, the Wood Frame Construction Joint Task
Force recommended that the quality of woodframe
construction needed to be greatly improved. The
Task Force recommended that structural plans be
prepared by the engineer or architect so that plan
HOA.105522003.7 36
Code
Section
Condition Explanation of Amendment
examiners, building inspectors, contractors, and
special inspectors may logically follow and construct
the seismic force-resisting systems as presented in
the construction documents. For buildings or
structures located in Seismic Design Category D 0 , D 1 , D 2, or E that are subject to a greater level of seismic forces, the requirement to have a California licensed
architect or engineer prepare the construction
documents is intended to minimize or reduce
structural deficiencies that may cause excessive
damage or injuries in woodframe buildings.
Involvement of a registered professional will minimize
the occurrence of structural deficiencies such as plan
and vertical irregularities, improper shear transfer of the seismic force-resisting system, missed details or
connections important to the structural system, and
the improper application of the prescriptive
requirements of the California Residential Code.
R301.1.5 Geological
Topographical
Due to the local topographical and geological
conditions of the sites within the greater Los Angeles
region and their susceptibility to earthquakes, this
technical amendment is required to address and
clarify special needs for buildings constructed on
hillside locations. A joint Structural Engineers
Association of Southern California (SEAOSC) and
Los Angeles City Joint Task Force investigated the
performance of hillside building failures after the
Northridge Earthquake. Numerous hillside failures
resulted in loss of life and millions of dollars in
damage. These criteria were developed to minimize
the damage to these structures and have been in use
by the City and County of Los Angeles for several
years.
R301.2.2.6 Geological Los Angeles County is prone to seismic activity due to the existence of active faults in the Southern
California area. Due to the high geologic activities in the Southern California area and the necessary
higher level of performance required for buildings and
structures, this local amendment limits the type of
irregular conditions as specified in the California
Residential Code. Such limitations are recommended
to reduce structural damage in the event of an
HOA.105522003.7 37
Code
Section
Condition Explanation of Amendment
earthquake. The County of Los Angeles and cities in
this region have implemented these extra measures
to maintain the structural integrity of the framing of
the shear walls and all associated elements when
designed for high levels of seismic loads.
R301.2.2.11 Geological Los Angeles County is prone to seismic activity due to the existence of active faults in the Southern
California area. Due to the high geologic activity in
the Southern California area and the necessary
higher level of performance required for buildings and
structures, this local amendment limits the potential
anchorage and supporting frame failure resulting from
additional weight. There is no limitation for weight of mechanical and plumbing fixtures and equipment in
the International Residential Code. Requirements
from ASCE 7 and the International Building Code
would permit equipment weighing up to 400 lbs. when
mounted at 4 feet or less above the floor or attic level without engineering design. Where equipment
exceeds this requirement, it is the intent of this
amendment that a registered design professional be
required to analyze if the floor support is adequate
and structurally sound.
Table
R302.1(2)
Climatic This amendment will not allow unprotected openings (openings that do not resist the spread of fire) to be in the exterior wall of a residential building that is
located on a property line. This amendment is
necessary due to local climatic conditions. The hot,
dry weather conditions of late summer in combination
with the Santa Ana winds creates an extreme fire
danger. Residential buildings with unprotected
openings located on a property line may permit fires
to spread from the inside of the building to adjacent
properties and likewise from exterior properties to the interior of the building.
R337.1.1
R337.1.2
Climatic Clarifies the application of Chapter 5 of the California Wildland Interface Code to harden additions,
alterations, and/or relocated buildings. Many areas of
the County have been designated as Fire Hazard
Severity Zones due to the increased risk of fire
caused by low humidity, strong winds, and dry
vegetation. Additions, alterations, and/or relocated
HOA.105522003.7 38
Code
Section
Condition Explanation of Amendment
buildings have the same fire risk as new buildings.
R337.1.3
R337.1.5
R337.1.6
Climatic Disallows the use of wood-shingle/wood-shake roofs due to the increased risk of fire in the County caused
by low humidity, strong winds, and dry vegetation in
high fire severity zones in order to further harden
residential buildings against fire risk.
R337.1.7 Climatic Disallows the use of Class B wood-shingle/woodshake roofs due to the increased risk of fire in the County caused by low humidity, strong winds, and dry
vegetation in high fire severity zones in order to
further harden residential buildings against fire risk.
R401.1 Geological Los Angeles County is prone to seismic activity due to the existence of active faults in the Southern
California area. Wood foundations, even those that
are preservative-treated, encounter a higher risk of
deterioration when contacting the adjacent ground.
The required seismic anchorage and transfer of
lateral forces into the foundation system necessary
for 2-story structures and foundation walls could
become compromised at varying states of wood
decay. In addition, global structure overturning
moment and sliding resistance is reduced when
utilizing wood foundations as opposed to
conventional concrete or masonry systems.
However, non-occupied, single-story storage
structures pose significantly less risk to human safety and may utilize the wood foundation guidelines
specified in this Chapter.
R403.1.2
R403.1.3.6
R403.1.5
Figure
R403.1.5
Climatic
Geological
Los Angeles County is prone to seismic activity due
to the existence of active faults in the Southern
California area. These amendments require
minimum reinforcement in continuous footings and
stepped footings to address the problem of poor
performance of plain or under-reinforced footings
during a seismic event. These amendments
implement the recommendations of SEAOSC and the
Los Angeles City Joint Task Force resulting from their
investigation of the 1994 Northridge Earthquake.
Interior walls can easily be called upon to resist over half of the seismic loading imposed on simple
buildings or structures. Without a continuous
foundation to support the braced wall line, seismic
HOA.105522003.7 39
Code
Section
Condition Explanation of Amendment
loads would be transferred through other elements
such as non-structural concrete slab floors, wood
floors, etc. Requiring interior braced walls to be
supported by continuous foundations is intended to
reduce or eliminate the poor performance of buildings
or structures.
R404.2 Climatic
Geological
No substantiating data has been provided to show
that wood foundations are effective in supporting
structures and buildings during a seismic event while
being subject to deterioration caused by the presence
of water and other materials detrimental to wood
foundations in the soil. Wood foundations, when they
are not properly treated and protected against
deterioration, have performed very poorly and have
led to slope failures. Most contractors are typically
accustomed to construction in dry weather in the
Southern California region and are not generally
familiar with the necessary precautions and treatment
of wood that makes it suitable for both seismic events
and wet applications. With the higher seismic
demand placed on buildings and structures in this
region, coupled with the dryer weather conditions, it is the intent of this amendment to reduce or eliminate
potential problems resulting from the use of wood
footings and foundations.
R501.2 Geological Due to the high geologic activities in the Southern California area and the necessary higher level of
performance required for buildings and structures,
this local amendment limits the potential anchorage
and supporting frame failure resulting from additional
weight. There is no limitation for weight of
mechanical and plumbing fixtures and equipment in
the International Residential Code. Requirements
from ASCE 7 and the International Building Code
would permit equipment weighing up to 400 lbs. when
mounted at 4 feet or less above the floor or attic level without engineering design. Where equipment
exceeds this requirement, it is the intent of this
amendment that a registered design professional be
required to analyze if the floor support is adequate
and structurally sound.
HOA.105522003.7 40
Code
Section
Condition Explanation of Amendment
R503.2.4
Figure
R503.2.4
Geological Section R502.10 of the Code does not provide any prescriptive criteria to limit the maximum floor
opening size, nor does Section R503 provide any
details to address the issue of shear transfer near
larger floor openings. With the higher seismic
demand placed on buildings and structures in this
region, it is important to ensure that a complete load
path is provided to reduce or eliminate potential
damage caused by seismic forces. Requiring
blocking with metal ties around larger floor openings
and limiting opening size is consistent with the
requirements of Section R301.2.2.6.
Table
R602.3(1)
Table
R602.3(2)
Geological Los Angeles County is prone to seismic activity due to the existence of active faults in the Southern
California area. In September 2007, limited cyclic
testing data was provided to the ICC Los Angeles
Chapter Structural Code Committee showing that
stapled wood structural shear panels do not exhibit
the same behavior as the nailed wood structural
shear panels. The test results of the stapled wood
structural shear panels demonstrated lower strength
and drift than the nailed wood structural shear panel
test results. Therefore, the use of staples as
fasteners for shear walls sheathed with other
materials shall not be permitted without being
substantiated by cyclic testing.
R602.3.2
Table
R602.3.2
Geological Los Angeles County is prone to seismic activity due to the existence of active faults in the Southern
California area. The County of Los Angeles and
cities in this region have taken extra measures to
maintain the structural integrity of the framing of the shear walls when designed for high levels of seismic
loads by eliminating single top plate construction.
The performance of modern day braced wall panel
construction is directly related to an adequate load
path extending from the roof diaphragm to the
foundation system.
R602.10.2.3 Geological The greater Los Angeles region is a densely populated area having buildings and structures
constructed over and near a vast array of fault
systems capable of producing major earthquakes,
including, but not limited, to the 1994 Northridge
HOA.105522003.7 41
Code
Section
Condition Explanation of Amendment
Earthquake. Plywood shear walls with high aspect
ratio experienced many failures during the Northridge
Earthquake. This proposed amendment specifies a
minimum braced wall length to meet an aspect ratio
consistent with other sections of the California
Residential Code, and to assure that new buildings
and additions to existing buildings are designed and
constructed in accordance with the scope and
objectives of the California Residential Code. This is
intended to improve the performance level of
buildings and structures that are subject to the higher seismic demands and reduce and limit potential
damage to property. This proposed amendment
reflects the recommendations by SEAOSC and the
Los Angeles City Joint Task Force that investigated
the poor performance observed during the 1994
Northridge Earthquake.
Table
R602.10.3(3
)
Geological Due to the high geologic activities in the Southern California area and the necessary higher level of
performance of buildings and structures, this local
amendment reduces or eliminates the allowable
shear values for shear walls sheathed with lath,
plaster, or gypsum board. The poor performance of
such shear walls sheathed with other materials in the
1994 Northridge Earthquake was investigated by
SEAOSC and the Los Angeles City Joint Task Force.
The County of Los Angeles and cities in this region
have taken extra measures to maintain the structural
integrity of the framing of the shear walls when
designed for high levels of seismic loads.
Table
R602.10.4
Geological 3/8" thick 3 ply-plywood shear walls experienced many failures during the Northridge Earthquake. This
amendment specifies minimum WSP sheathing thic
kness and nail size and spacing, so as to provide a
uniform standard of construction to improve the
performance level of buildings and structures, given
the potential for higher seismic demands placed on
buildings or structure in this region. This proposed
amendment reflects the recommendations by
SEAOSC and the Los Angeles City Joint Task Force
following the 1994 Northridge Earthquake. In
September 2007, cyclic testing data was provided to
HOA.105522003.7 42
Code
Section
Condition Explanation of Amendment
the Los Angeles Chapter Structural Code Committee
showing that stapled wood structural shear panels
underperformed nailed wood structural shear panels.
Test results of the stapled wood structural shear
panels appeared much lower in strength and drift
than the nailed wood structural shear panel test
results.
Table
R602.10.5
Geological Los Angeles County is prone to seismic activity due to the existence of active faults in the Southern
California area. The poor performance of such shear
walls sheathed in the 1994 Northridge Earthquake
was investigated by SEAOSC and the Los Angeles
City Joint Task Force. The County of Los Angeles
and cities in this region have taken extra measures to
maintain the structural integrity with respect to the " maximum shear wall aspect ratios" of the framing of
the shear walls when designed for high levels of
seismic loads. This amendment is consistent with the
shear wall aspect ratio provision of Section 4.3.3 of
AWC SDPWS-2021.
Figure
R602.10.6.1
Geological 3/8" thick 3 ply-plywood shear walls experienced many failures during the Northridge Earthquake. The
poor performance of shear walls in the 1994
Northridge Earthquake was investigated by SEAOSC
and the Los Angeles City Joint Task Force. Box nails
were observed to cause massive and multiple failures
of the typical 3/8" thick 3 ply-plywood during the
Northridge Earthquake. The County of Los Angeles
and cities in this region have taken extra measures to
maintain the structural integrity of the framing of the shear walls when designed for high levels of seismic
loads. The performance of modern day braced wall
panel construction is directly related to an adequate
load path extending from the roof diaphragm to the
foundation system.
Figure
R602.10.6.2
Geological 3/8" thick 3 ply-plywood shear walls experienced many failures during the Northridge Earthquake. The
poor performance of such shear walls in the 1994
Northridge Earthquake was investigated by SEAOSC
and the Los Angeles City Joint Task Force. The
County of Los Angeles and cities in this region have
taken extra measures to maintain the structural
HOA.105522003.7 43
Code
Section
Condition Explanation of Amendment
integrity of the framing of the shear walls when
designed for high levels of seismic loads. Box nails
were observed to cause massive and multiple failures
of typical 3/8-inch thick plywood during the Northridge Earthquake. This change to the minimum lap splice
requirement is consistent with Section 25.5 of ACI
318-19.
Figure
R602.10.6.4
Geological 3/8" thick 3 ply-plywood shear walls experienced many failures during the Northridge Earthquake. The
poor performance of such shear walls in the 1994
Northridge Earthquake was investigated by SEAOSC
and the Los Angeles City Joint Task Force. The
County of Los Angeles and cities in this region have
taken extra measures to maintain the structural
integrity of the framing of the shear walls when
designed for high levels of seismic loads. The
proposal in which "washers shall be a minimum of
0.229 inch by 3 inches by 3 inches in size" is
consistent with Section R602.11.1 of the California
Residential Code and Section 2308.7.1 of the
California Building Code.
R606.4.4 Geological Los Angeles County is prone to seismic activity due to the existence of active faults in the Southern
California area. The addition of the word "or" will
prevent the use of unreinforced parapets in Seismic
Design Category D 0 , D 1 , or D 2 , or on townhouses in Seismic Design Category C.
R606.12.2.2.
3 Geological Los Angeles County is prone to seismic activity due to the existence of active faults in the Southern
California area. Reinforcement using longitudinal
wires for buildings and structures located in high
seismic areas is not as ductile as deformed rebar.
Having vertical reinforcement closer to the ends of
masonry walls helps to improve the seismic
performance of masonry buildings and structures.
R803.2.4 Geological Section R802 of the Code does not provide any prescriptive criteria to limit the maximum size of roof openings, nor does Section R803 provide any details
to address the issue of shear transfer near larger roof openings. With the higher seismic demand placed on
buildings and structures in this region, it is important to ensure that a complete load path is provided to
HOA.105522003.7 44
Code
Section
Condition Explanation of Amendment
reduce or eliminate potential damage caused by
seismic forces. Requiring blocking with metal ties
around larger roof openings and limiting the size of
openings is consistent with the requirements of
Section R301.2.2.6.
R1001.3.1 Geological Los Angeles County is prone to seismic activity due to the existence of active faults in the Southern
California area. The performance of
fireplaces/chimneys without anchorage to the
foundation has been observed to be inadequate
during major earthquakes. The lack of anchorage to
the foundation results in overturn or displacement.
Appendix BJ
BJ106.1
Geological Los Angeles County is prone to seismic activity due to the existence of active faults in the Southern
California area. Due to the limited seismic
performance information on strawbale construction,
this amendment is intended to limit the higher risk
strawbale construction poses in a high seismic
region.
Appendix CJ
CJ101.1,
CJ102.1,
CJ103.1,
CJ103.4,
CJ107.1
Administrative,
Climatic,
Geologic,
Topographical
Adoption of this appendix is necessary because strict
compliance with state and local standards and laws
would prevent, hinder, or delay the mitigation of the
effects of a declared shelter crisis or other
emergency. The modifications to this appendix are
administrative in nature, to provide clarification of
various provisions of the language of this voluntary
Appendix.
CJ106.1 Climatic Los Angeles County is subject to extreme temperatures, and many of these membrane
structures will be erected and occupied during severe
weather events. It is necessary to include this
amendment to ensure the safety, health, and comfort
of the occupants is maintained during extreme heat
and cold.
CJ110.1.1,
CJ110.1.2
Administrative These sections are simply a cross reference to the State Plumbing Code requirement for user
convenience and is not adding a new building
standard nor enacting a more restrictive requirement.
To the extent findings are requested, see prefatory
language in this Section.
CJ110.3 Climatic The County may utilize mobile restroom facilities that are physically separate from the living facilities. Due
HOA.105522003.7 45
Code
Section
Condition Explanation of Amendment
to the potential for severe local weather conditions,
with extreme temperatures or torrential rain, the
distance to the restroom facilities required for the
comfort, safety, and health of displaced people
should be reduced to 300 feet or as determined by
the Building Official.
SECTION 45. This ordinance shall become operative on January 1, 2026. [TITLE30RESDCODE2025CSCC]
SECTION 46. This ordinance shall be published in The Daily Commerce a newspaper printed and published in the County of Los Angeles.
Chair
ATTEST:
Edward Yen
Executive Officer -
Clerk of the Board of Supervisors
County of Los Angeles
I hereby certify that at its meeting of November 25, 2025 the foregoing ordinance was adopted by the Board of Supervisors of said County of Los Angeles by the following vote, to wit:
Ayes Noes
Supervisors Hilda L. Solis Supervisors None
Holly J. Mitchell
Lindsey P. Horvath
Janice Hahn
Kathryn Barger
Effective Date: December 26, 2025
Operative
Date: January 6, 2026
Edward Yen
Executive Officer -
Clerk of the Board of Supervisors
County of Los Angeles
APPROVED AS TO FORM:
DAWYN R. HARRISON
County Counsel
By
Nicole Davis Tinkham
Chief Deputy County Counsel
S:\Ordinances\County Counsel\2025\2025-0051
HOA.105511798.7
ANALYSIS
This ordinance repeals those provisions of Title 31 – Green Building Standards Code – of the Los Angeles County Code that incorporated by reference portions of the 2022 Edition of the California Green Building Standards Code, and the ordinance replaces them with provisions incorporating by reference portions of the 2025 California Green Building Standards Code, as published by the California Building Standards Commission, with certain changes and modifications.
State law requires that the County adopt ordinances that contain the same requirements as are contained in the building standards published in the most recent edition of the California Green Building Standards Code. State law allows the County to change or modify these requirements in compliance with section 17958 of the California Health and Safety Code.
The changes and modifications to requirements contained in the building standards published in the 2025 California Green Building Standards Code that are contained in this ordinance are based upon express findings, contained in the ordinance, that such changes are reasonably necessary due to local climatic, g eological, or topographical conditions. These changes and modifications are substantially equivalent to changes or modifications previously filed with the California Building Standards Commission by the County of Los Angeles, which were in effect as of September 30, 2025.
DAWYN R. HARRISON
County Counsel
By
MARGARET AMBROSE
Senior Deputy County Counsel
Public Works Division
MA/bc
Requested: 8/6/25
Revised: 10/1/25
Attachment B Page 356 of 441
ORDINANCE NO. 2025-0052
An ordinance amending Title 31 – Green Building Standards Code – of the Los Angeles County Code by adopting and incorporating by reference the 202225 California Green Building Standards Code with certain changes and modifications, and making other revisions thereto.
The Board of Supervisors of the County of Los Angeles ordains as follows:
SECTION 1. Chapters 2 through 8, and Appendix A4 and Appendix A5, of this Title 31 of the Los Angeles County Code, which incorporate by reference and modify portions of the 201922 California Green Building Standards Code, are hereby repealed.
SECTION 2. Section 100 is hereby amended to read as follows:
100 ADOPTION AND INCORPORATION BY REFERENCE
Except as hereinafter changed or modified, Sections 102 through 119 of Chapter 1 of Title 26 of the Los Angeles County Code are adopted and incorporated by reference into this Title 31 as if fully set forth below, and shall be known as Sections 102 through 119 of Chapter 1 of Title 31 of the Los Angeles County Code.
Except as hereinafter changed or modified, Chapters 2 through 8, and Appendix A4 and Appendix A5, of that certain code known and designated as the 202225 California Green Building Standards Code, as published by the California Building Standards Commission, are adopted and incorporated by reference into this Title 31, as if fully set forth below, and shall be known as Chapters 2 through 8, and Appendix A4 and Appendix A5, of Title 31 of the Los Angeles County Code.
HOA.105511798.7 2
A copy of the 202225 California Green Building Standards Code shall be at all times maintained by the Building Official for use and examination by the public.
SECTION 3. Section 202 is hereby amended to read, in alphabetical order, as follows:
202 DEFINITIONS
. . .
COOL ROOF. A roofing material that reduces heat gain through the roof and has either high thermal emittance and high solar reflectance, or low thermal emittance and exceptionally high solar reflectance, as specified in Title 24, Part 6, of the California Energy Code.
COOL ROOF RATING COUNCIL or CRRC. The entity recognized by the California Energy Commission to rate and certify the reflectance and emittance values of roofing products.
. . .
DEVELOPMENT. Any activity requiring discretionary or non-discretionary land use or construction approval from the County that results in the creation, addition, modification, or replacement of impervious surface area, that is not part of routine maintenance activity. Development includes, but is not limited to, land subdivisions; the construction, installation, addition, or replacement of a building or structure; expansion of a building footprint; and land-disturbing activities related to structural or impervious surfaces. Development shall not include routine maintenance of original lines and grades and/or hydraulic capacity.
HOA.105511798.7 3
. . .
SECTION 4. Section 301 is hereby amended to read as follows:
301 GENERAL
301.1 Scope.
Buildings and structures shall be designed to include the green building measures specified as mandatory in the application checklists contained in this code.
Voluntary green building measures are also included in the application checklists and may be included in the design and construction of structures covered by this code, but are not required unless adopted by a city, county or city and county as specified in Section 101.7indicated in Sections 301.1.1, 301.2, and 301.3. 301.1.1 Additions and alterationsResidential construction. [HCD]
The mandatory provisions of Chapter 4 shall be applied to newly constructed low-rise and high-rise residential buildings and structures six stories or less and additions to or alterations of existing residential buildings where the addition or alteration increases the building's conditioned area, volume or size. The requirements shall apply only to and/or within the specified area of the addition or alteration. . . .
Newly constructed high-rise residential buildings of seven stories or greater shall comply with Section 301.3.
. . .
HOA.105511798.7 4
301.3 Nonresidential additions and alterationsconstruction. [BSC - CG]
. . .
301.3.3 Nonresidential buildings greater than or equal to 25,000 square feet.
In addition to the requirements of Section 301.3, any newly constructed nonresidential building greater than or equal to 25,000 square feet shall comply with all requirements of Section A5.601.2.4 Tier 1. Roofing materials shall comply with Tier 2 requirements of Table A5.106.11.2.3 [BSC].
Exceptions:
1. Compliance with Section A5.601.2.3 shall be voluntary.
2. High-rise residential buildings of seven stories or greater shall comply with Table A4.106.5.1(4) in lieu of Table A5.106.11.2.3.
SECTION 5. Section 4.106.4 is hereby amended to read as follows:
. . .
4.106.4.1 New one- and two-family dwellings and townhouses with attached private garages.
For each dwelling unit, install a listed raceway to accommodateand a dedicated 208/240-volt branch circuit. The raceway shall not be less than trade size 1 (nominal 1- inch inside diameter). The raceway shall originate at the main service or subpanel and shall terminate into a listed cabinet, box, or other enclosureattachment plug in close proximity to the proposed location of an EV charger. Raceways are required to be
HOA.105511798.7 5
continuous at enclosed, inaccessible or concealed areas and spaces. The service panel and/or subpanel shall provide capacity to install a 40-ampere 208/240-volt minimum dedicated branch circuit and space(s) reserved to permit installation of a branch circuit overcurrent protective device.
Exception: A raceway is not required if a minimum 40-ampere 208/240-volt dedicated EV branch circuit is installed in close proximity to the proposed location of an EV charger at the time of original construction in accordance with the California Electrical Code.
4.106.4.1.1 Identification.
The service panel or subpanel circuit directory shall identify the overcurrent protective device space(s) reserved for future EV charging as "EV CAPABLE". The raceway termination location shall be permanently and visibly marked as "EV CAP ABLE".
. . .
SECTION 6. Section 4.106.5 is hereby added to read as follows:
4.106.5 Low-impact development (LID).
New development or alterations to existing developed sites shall comply with Chapter 12.84 of Title 12 of the Los Angeles County Code.
SECTION 7. Section 4.106.6 is hereby added to read as follows:
4.106.6 Cool roof for reduction of heat island effect.
Roofing materials for conditioned and unconditioned spaces shall comply with the solar reflectance and thermal emittance requirements of this Section.
HOA.105511798.7 6
Exceptions:
1. Roof repair.
2. Roof replacement when the roof area being replaced is equal to or less than fifty (50) percent of the total roof area.
3. Installation of building-integrated photovoltaics.
4. Installation of a steep-sloped roof (roof slope > 2:12) in climate zone 16 on other than a low-rise multifamily building.
5. Additions resulting in less than 500 square feet of added roof area or less than fifty (50) percent of the total roof area, whichever is greater.
6. Roof construction that has a thermal mass over the roof membrane, including areas of vegetated (green) roofs, weighing at least 25 pounds per square foot.
4.106.6.1 Solar reflectance.
Roofing materials shall have a minimum 3-year aged solar reflectance equal to or greater than the values specified in Table 4.106.6(1) and Table 4.106.6(2).
Solar reflectance values shall be based on the aged reflectance value of the roofing product or the equation in Section A4.106.5.1, if the CRRC testing for aged solar reflectance is not available.
4.106.6.2 Thermal emittance.
Roofing materials shall have a CRRC initial or aged thermal emittance equal to or greater than the values specified in Table 4.106.6(1) and Table 4.106.6(2).
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4.106.6.3 Solar reflectance index alternative.
Roofing materials having a Solar Reflectance Index (SRI) equal to or greater than the values specified in Table 4.106.6(1) and Table 4.106.6(2) may be used as an alternative to compliance with the 3-year aged solar reflectance and thermal emittance values.
SRI values used to comply with this Section shall be calculated using the SRI Calculation Worksheet (SRI-WS) developed by the California Energy Commission or in compliance with ASTM E1980-01, as specified in the current California Energy Code.
Solar reflectance values used in the SRI-WS shall be based on the aged reflectance value of the roofing product or the equation in Section A4.106.5.1, if the CRRC-certified aged solar reflectance is not available. Certified thermal emittance used in the SRI-WS may be either the initial value or the aged value listed by the CRRC.
Note: The Solar Reflectance Index Calculation Worksheet (SRI-WS) is available by contacting the Energy Standards Hotline at 1-800-772-3300, website at www.energy.ca.gov or by email at [email protected].
SECTION 8. Tables 4.106.6(1) and 4.106.6(2) are hereby added to read as follows:
TABLE 4.106.6(1) – LOW-RISE RESIDENTIAL
ROOF SLOPE MINIMUM 3-YEAR
AGED SOLAR
REFLECTANCE
THERMAL
EMITTANCE
SRI
≤2:12 0.65 0.85 78
>2:12 0.25 0.85 20
HOA.105511798.7 8
TABLE 4.106.6(2) – HIGH RISE RESIDENTIAL BUILDINGS, HOTELS AND MOTELS ROOF SLOPE MINIMUM 3-YEAR
AGED SOLAR
REFLECTANCE
THERMAL
EMITTANCE
SRI
≤2:12 0.65 0.75 78
>2:12 0.25 0.75 20
SECTION 9. Section 4.408 is hereby amended to read as follows:
4.408 CONSTRUCTION WASTE REDUCTION, DISPOSAL AND
RECYCLING
4.408.1 Construction waste management.
Newly-constructed projects and additions and alterations to existing buildings shall Rrecycle and/or salvage for reuse a minimum of sixty-five (65) percent of the nonhazardous construction and demolition wastedebris in accordance with either Section
4.408.2, 4.408.3, or 4.408.4, or meet a more stringent local construction and demolition waste management ordinance, whichever is more stringent. Calculate the amount of materials diverted by weight or by volume, but not by both. . . .
SECTION 10. Section 5.106.3 is hereby added to read as follows:
5.106.3 Low-impact development (LID).
New development or alterations to existing developed sites shall comply with Chapter 12.84 of Title 12 of the Los Angeles County Code.
HOA.105511798.7 9
SECTION 11. Section 5.106.11 is hereby added to read as follows:
5.106.11 Cool roof for reduction of heat island effect.
Roofing materials for conditioned and unconditioned spaces shall comply with the solar reflectance and thermal emittance requirements of this Section.
Exceptions:
1. Roof repair.
2. Roof replacement when the roof area being replaced is equal to or less than fifty (50) percent of the total roof area.
3. Installation of building-integrated photovoltaics.
4. Additions resulting in less than 500 square feet of added roof area or less than fifty (50) percent of the total roof area, whichever is greater.
5. Roof construction that has a thermal mass over the roof membrane, including areas of vegetated (green) roofs, weighing at least 25 pounds per square foot.
5.106.11.1 Solar reflectance.
Roofing materials shall have a minimum 3-year aged solar reflectance equal to or greater than values specified in Table 5.106.11.
Solar reflectance values shall be based on the aged reflectance value of the roofing product or the equation in Section A5.106.11.2.1, if the CRRC testing for aged solar reflectance is not available.
5.106.11.2 Thermal emittance.
Roofing material shall have a CRRC initial or aged thermal emittance equal to or greater than the values specified in Table 5.106.11.
HOA.105511798.7 10
5.106.11.3 Solar reflectance index alternative.
Roofing material having a Solar Reflectance Index (SRI) equal to or greater than the values specified in Table 5.106.11 may be used as an alternative to compliance with the 3-year aged solar reflectance and thermal emittance values.
SRI values used to comply with this Section shall be calculated using the SRI Calculation Worksheet (SRI-WS) developed by the California Energy Commission or in compliance with ASTM E1980-11, as specified in the current California Energy Code.
Solar reflectance values used in the SRI-WS shall be based on the aged reflectance value of the roofing product or the equation in Section A5.106.11.2.1, if the CRRCcertified aged solar reflectance is not available. Certified thermal emittance used in the SRI-WS may be either the initial value or the aged value listed by the CRRC.
Note: The Solar Reflectance Index Calculation Worksheet (SRI-WS) is available by contacting the Energy Standards Hotline at 1-800-772-3300, website at www.energy.ca.gov or by email at [email protected].
SECTION 12. Table 5.106.11 is hereby added to read as follows:
TABLE 5.106.11
ROOF SLOPE MINIMUM 3-YEAR AGED
SOLAR REFLECTANCE
THERMAL
EMITTANCE
SRI
≤2:12 0.68 0.85 82
>2:12 0.28 0.85 27
HOA.105511798.7 11
SECTION 13. Section 5.408.1 is hereby amended to read as follows:
5.408.1 Construction waste management.
Newly-constructed projects and additions and alterations to existing buildings shall Rrecycle and/or salvage for reuse a minimum of sixty-five (65) percent of the non -hazardous construction and demolition wastedebris in accordance with Section
5.408.1.1, 5.408.1.2, or 5.408.1.3; or meet a local construction and demolition waste management ordinance, whichever is more stringent. Calculate the amount of materials diverted by weight or volume, but not by both.
SECTION 14. Appendix A4 is hereby amended to read as follows:
APPENDIX A4
RESIDENTIAL VOLUNTARY MEASURES
Some of tThe measures contained in this appendix are not mandatory unless adopted by a city, county or city and county as specified in Section 101.7 and provide additional measures thatexcept to the extent indicated elsewhere in this Code. d Designers, builders, and property owners may wishare encouraged to consider all of these measures during the planning, design, and construction process.
SECTION 15. Section A4.108.1 is hereby amended to read as follows:
A4.108.1 Innovative concepts and local environmental conditions.
The provisions of this cCode are not intended to prevent the use of any alternate material, appliance, installation, device, arrangement, method, design, or method of construction not specifically prescribed by this cCode. This code does not limit the
HOA.105511798.7 12
authority of city, county, or city and county government to make necessary changes to the provisions contained in this code pursuant to Section 101.7.1.
SECTION 16. Section A4.306.1 is hereby amended to read as follows:
A4.306.1 Innovative concepts and local environmental conditions.
The provisions of this cCode are not intended to prevent the use of any alternate material, appliance, installation, device, arrangement, method, design, or method of construction not specifically prescribed by this cCode. This code does not limit the authority of city, county, or city and county government to make necessary changes to the provisions contained in this code pursuant to Section 101.7.1.
SECTION 17. Section A4.411.1 is hereby amended to read as follows:
A4.411.1 Innovative concepts and local environmental conditions.
The provisions of this cCode are not intended to prevent the use of any alternate material, appliance, installation, device, arrangement, method, design, or method of construction not specifically prescribed by this cCode. This code does not limit the authority of city, county, or city and county government to make necessary changes to the provisions contained in this code pursuant to Section 101.7.1.
SECTION 18. Section A4.509.1 is hereby amended to read as follows:
A4.509.1 Innovative concepts and local environmental conditions.
The provisions of this cCode are not intended to prevent the use of any alternate material, appliance, installation, device, arrangement, method, design, or method of construction not specifically prescribed by this cCode. This code does not limit the
HOA.105511798.7 13
authority of city, county, or city and county government to make necessary changes to the provisions contained in this code pursuant to Section 101.7.1.
SECTION 19. Section A4.601.1 is hereby amended to read as follows:
A4.601.1 Scope.
The measures contained in this appendix are not mandatory unless adopted by a city, county, or city and county as specified in Section 101.7except to the extent indicated elsewhere in this Code. The provisions of this sSection outline means of achieving enhanced construction or reach levels by incorporating additional green building measures. In order to meet one of the tier levels, designers, builders or property owners are required to incorporate additional green building measures necessary to meet the threshold of each level.
SECTION 20. Section A4.601.2 is hereby amended to read as follows:
A4.601.2 Prerequisite measures.
Tier 1 and Tier 2 thresholds require compliance with the mandatory provisions of this cCode and incorporation of the required prerequisite measures listed in Section A4.601.4.2 for Tier 1 and A4.601.5.2 for Tier 2. Prerequisite measures are also identified in the Residential Occupancies Application Checklist in Section A4.602.
As specified in Section 101.7, additional prerequisite measures may be included by the enforcing agency to address specific local environmental conditions and may be listed in the Innovative Concepts and Local Environmental Conditions portions of the checklist.
HOA.105511798.7 14
SECTION 21. Section A4.602 is hereby amended to read as follows:
RESIDENTIAL OCCUPANCIES APPLICATION CHECKLIST
. . .
1 Green building measures listed in this table may be mandatory if adopted by a city, county, or city and county as specified in Section 101.7.Reserved. . . .
SECTION 22. Section A4.701.1 is hereby amended to read as follows:
A4.701.1 General.
The voluntary measures of this cCode are designed and promulgated to be adopted by reference and made mandatory by local ordinance pursuant to Section 101.7. Jurisdictions wishing to adopt the voluntary provisions of this cCode as an enforceable regulation governing structures and premises should ensure that certain factual information is included in the adopting ordinance and that the measures are appropriate and achievable and are considered to be suitable as mandatory by the city, county, or city and county. The following sample adoption ordinance addresses several key elements of a code adoption ordinance, including the information required for insertion into thesuch code text.
. . .
HOA.105511798.7 15
SECTION 23. The Appendix A5 heading is hereby amended to read as follows:
APPENDIX A5
NON-RESIDENTIAL VOLUNTARY MEASURES
The measures contained in this appendix are not mandatory unless adopted by a city, county, or city and county as specified in Section 101.7 and provide additional measures thatexcept to the extent indicated elsewhere in this Code. dDesigners, builders and property owners may wishare encouraged to consider all of these measures during the planning, design, and construction process.
SECTION 24. Section A5.601.1 is hereby amended to read as follows:
A5.601.1 Scope.
The measures contained in this appendix are not mandatory unless adopted by local government as specified in Section 101.7except to the extent indicated elsewhere in this Code. The provisions of this sSection outline means of achieving enhanced construction or reach levels by incorporating additional green building measures for newly constructed nonresidential buildings as well as additions and alterations. In order to meet one of the tier levels, designers, builders or property owners are required to incorporate additional green building measures necessary to meet the threshold of each level. Refer to the provisions in Section 301.3 for non-residential additions and alterationsconstruction scope and application.
HOA.105511798.7 16
SECTION 25. The provisions of this ordinance contain various changes, modifications, and additions to the 202225 Edition of the California Green Building Standards Code. Some of these changes are administrative in nature in that they do not constitute changes or modifications to requirements contained in the building standards published in the California Green Building Standards Code.
Pursuant to California Health and Safety Code sections 17958.5, 17958.7, and 18941.5, the Board of Supervisors hereby expressly finds that all of the changes and modifications to requirements contained in the building standards published in the California Building Standards Code that are contained in this ordinance are reasonably necessary because of local climatic, geological, or topographical conditions in the County of Los Angeles due to the potential for seismic activity in the region, topographical conditions that contribute to the spread of wild fires, and climatic conditions that impact air quality and increase the risk of wild fires. In addition, the Board of Supervisors expressly finds that the modifications herein are substantially equivalent to modifications that were previously filed by the County of Los Angeles and were in effect as of September 30, 2025. Without limiting the foregoing, the County makes additional findings herein:
HOA.105511798.7 17
GREEN BUILDING STANDARDS CODE AMENDMENTS
CODE
SECTION CONDITION EXPLANATION
301.1, 301.1.1 Climatic and
Topographic
Environmental resources in the County of Los
Angeles are scarce due to varying, and
occasionally immoderate, temperatures and
weather conditions. Expanding the scope of the
mandatory requirements of this Code for all
residential additions and alterations, and for
residential buildings of seven stories or greater in
height, will achieve a greater reduction in
greenhouse gases, higher efficiencies of energy,
water, and material usage, and improved
environmental air quality.
301.3, 301.3.3 Climatic and
Topographic
Environmental resources in the County of Los
Angeles are scarce due to varying, and
occasionally immoderate, temperatures and
weather conditions. Expanding the scope of the
mandatory requirements of this Code for
nonresidential buildings and residential buildings
of seven stories or greater in height that are
greater than or equal to 25,000 square feet in floor
area will achieve a greater reduction in
greenhouse gases, higher efficiencies of energy,
water, and material usage, and improved
environmental air quality.
4.106.4.1,
4.106.4.1.1,
Climatic The County of Los Angeles is a densely populated area with elevated levels of greenhouse gas
emissions. The proposed modification to increase
the number of EV charging spaces and stations
will help to promote the use of electric vehicles
and significantly reduce local air and noise
pollution and greenhouse gas emissions, thereby
improving the health of the County's residents,
businesses, and visitors.
4.106.5 Climatic and
Topographic
The County of Los Angeles is a densely populated
area having residential buildings constructed
within a region where water is scarce and
maintaining storm water runoff quality is required.
The proposed low-impact development measures
will allow greater conservation of rain water,
increase in groundwater recharge, reduction of
HOA.105511798.7 18
GREEN BUILDING STANDARDS CODE AMENDMENTS
CODE
SECTION CONDITION EXPLANATION
storm water runoff, and improvement in storm
water runoff quality.
4.106.6,
4.106.6.1,
4.106.6.2,
4.106.6.3,
Table 4.106.6(1)
Table 4.106.6(2)
Climatic Environmental resources in the County of
Los Angeles are scarce due to varying, and
occasionally immoderate, temperatures and
weather conditions. Adding mandatory
requirements for cool roofs for residential
occupancies will achieve a greater reduction in
greenhouse gases, higher efficiencies of energy,
and improved environmental air quality.
5.106.3 Climatic and
Topographic
The County of Los Angeles is a densely populated
area having buildings constructed within a region
where water is scarce and maintaining storm
water runoff quality is required. The proposed
low-impact development measures will allow
greater conservation of rain water, increase in
groundwater recharge, reduction of storm water
runoff, and improvement in storm water runoff
quality.
5.106.11,
5.106.11.1,
5.106.11.2,
5.106.11.3,
Table 5.106.11
Climatic Environmental resources in the County of
Los Angeles are scarce due to varying, and
occasionally immoderate, temperatures and
weather conditions. Adding mandatory
requirements for cool roofs for nonresidential
occupancies will achieve a greater reduction in
greenhouse gases, higher efficiencies of energy,
and improved environmental air quality.
A5.601.1 Climatic and
Topographic
Environmental resources in the County of
Los Angeles are scarce due to varying, and
occasionally immoderate, temperatures and
weather conditions. Expanding the scope of the
mandatory requirements of this Code for
nonresidential buildings and residential buildings
of seven stories or greater in height that are
greater than or equal to 25,000 square feet in floor
area will achieve a greater reduction in
greenhouse gases, higher efficiencies of energy,
water, and material usage, and improved
environmental air quality.
HOA.105511798.7 19
SECTION 26. This ordinance shall become operative on January 1, 2026. [TITLE31GREENBUILDCODE2025CSCC]
SECTION 27. This ordinance shall be published in The Daily Commerce a newspaper printed and published in the County of Los Angeles.
Chair
ATTEST:
Edward Yen
Executive Officer -
Clerk of the Board of Supervisors
County of Los Angeles
I hereby certify that at its meeting of November 25, 2025 the foregoing ordinance was adopted by the Board of Supervisors of said County of Los Angeles by the following vote, to wit:
Ayes Noes
Supervisors Hilda L. Solis Supervisors None
Holly J. Mitchell
Lindsey P. Horvath
Janice Hahn
Kathryn Barger
Effective Date: December 25, 2025
Operative
Date: January 6, 2026
Edward Yen
Executive Officer -
Clerk of the Board of Supervisors
County of Los Angeles
APPROVED AS TO FORM:
DAWYN R. HARRISON
County Counsel
By
Nicole Davis Tinkham
Chief Deputy County Counsel
S:\Ordinances\County Counsel\2025\2025-0052
HOA.105518009.9
ANALYSIS
This ordinance repeals those provisions of Title 33 – Existing Building Code – of the Los Angeles County Code that incorporated by reference portions of the 2022 California Existing Building Code and replaces them with provisions incorporating by reference portions of the 2025 California Existing Building Code, published by the California Building Standards Commission, with certain changes and modifications.
Unless deleted or modified herein, the previously enacted provisions of Title 33 continue in effect.
State law requires that the County's Existing Building Code impose the same requirements as are contained in the building standards published in the most recent edition of the California Existing Building Code. State law allows the County to change or modify these requirements in compliance with section 17958 of the California Health and Safety Code.
The changes and modifications to requirements contained in the building standards published in the 2025 California Existing Building Code that are contained in this ordinance are based upon express findings, contained in the ordinance, that such changes are reasonably necessary due to local climatic, geological, or topographical conditions. These changes and modifications are substantially equivalent to changes or modifications previously filed by the County of Los Angeles, which were in effect as of September 30, 2025.
DAWYN R. HARRISON
County Counsel
By
MARGARET F. AMBROSE
Principal Deputy County Counsel
Public Works Division
MFA/bc:
Requested: 07/31/25
Revised: 10/22/25
Attachment B Page 377 of 441
ORDINANCE NO. 2025-0053
An ordinance amending Title 33 – Existing Building Code – of the Los Angeles County Code, to adopt and incorporate by reference the 202225 California Existing Building Code, with certain changes and modifications.
The Board of Supervisors of the County of Los Angeles ordains as follows:
SECTION 1. Chapters 2 through 5, 15, and 16, and Appendix A, Chapters A1, A3, A4, and A5, of this Title 33 of the Los Angeles County Code, which incorporate d by reference and modified portions of the 201922 California Existing Building Code, are hereby repealed.
SECTION 2. Chapter 1 is hereby amended to read as follows:
100 ADOPTION AND INCORPORATION BY REFERENCE
Except as hereinafter changed or modified, Sections 102 through 119 of Chapter 1 of Title 26 of the Los Angeles County Code are adopted and incorporated by reference into this Title 33 of the Los Angeles County Code as if fully set forth below, and shall be known as Sections 102 through 119 of Chapter 1 of Title 33 of the Los Angeles County Code.
Except as hereinafter changed or modified, Chapters 2 through 511, 14, 15, and 16, and Appendix A, Chapters A1, A3, A4, and A5, of that certain code known and designated as the 20222025 California Existing Building Code, as published by the California Building Standards Commission, are adopted and incorporated by reference into this Title 33, as if fully set forth below, and shall be known as Chapters 2 through
HOA.105518009.9 2
511, 14, 15 and 16, and Appendix A, Chapters A1, A3, A4, and A5, of Title 33 of the Los Angeles County Code.
A copy of the 20222025 California Existing Building Code shall be at all times maintained by the Building Official for use and examination by the public.
SECTION 3. Section 302.6 is hereby added to read as follows:
302.6 Parapets and appendages.
302.6.1 General compliance. Whenever the Building Official determines by inspection that, as a result of inadequate construction or bracing to resist horizontal forces, an existing parapet or appendage attached to and supported by an exterior wall of a building is likely to become a hazard to life or property in the event of earthquake disturbance, and such parapet or appendage is not an immediate hazard or danger, as described in Section 102, the Building Official may provide the owner of the building or other person or agent in control of the building, where such parapet or other appendage exists, with a written notice specifying the hazards and the inadequacies of the construction or bracing. The owner of the building or other person or agent in control of the building shall, within 12 months from the date of such written notice, eliminate the hazard as set forth below. Any person receiving notice as set out in this Section may appeal, in the manner provided by Section 102.4, to the Building Board of Appeals.
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302.6.2 Wall anchor. The parapet or appendage shall be removed and the remainder of the wall shall be anchored at the roof line, or it shall be reconstructed so that it will conform structurally as nearly as practicable to the requirements of Chapter 16 of the Building Code, or it shall be otherwise braced and strengthened in a manner satisfactory to the Building Official, so that it will resist a reasonable degree of horizontal forces without becoming dislodged or at risk of falling. 302.6.3 Inspection of existing condition. Where, in the opinion of the Building Official, it is necessary to open a portion of a roof, wall, or ceiling of a building in order to determine the structural condition of any parapet or appendage, the Building Official may order the owner to make such opening, and the owner shall comply with said order at the owner's sole cost and expense.
SECTION 4. Section 302.7 is hereby added to read as follows:
302.7 Existing glass. Whenever the Building Official determines by inspection that an existing glass installation, in rooms having an occupant load of more than 100 persons or a means of egress serving an occupant load of more than 100 persons, as determined by Chapter 10 of the Building Code, is likely to become a hazard in the event of accidental human impact, as described in Section 2406.4 of the Building Code, and such installation does not comply with the provisions for glazing in such locations, the Building Official may provide the owner of the building or other person or agent in control of the building where such glazing exists with a written notice of such condition. The owner of the building or other person or agent in control of the