Agenda packet, regular meeting, first session — Antioch City Council, September 8, 2026 (part 2 of 4)

PER SCHED.

DOUBLE HUNG
PER SCHED.

PER SCHED.

NO. TYPE
DOOR

REMARKSWIDTH HEIGHT
01 A 3' - 0" 6' - 8" 1, 2
02 B 2' - 0" 6' - 8" 1, 5
03 F 2' - 6" 6' - 8" 4
04 D 2' - 4" 6' - 8"
05 D 3' - 0" 6' - 8"
06 E 4' - 0" 6' - 8"
07 D 3' - 0" 6' - 8"
08 D 3' - 0" 6' - 8"
09 E 4' - 0" 6' - 8"
NO. TYPE
SIZE

HEAD HEIGHT REMARKSWIDTH HEIGHT
01 A 5' - 0" 4' - 0" 6' - 8"
02 A 5' - 0" 4' - 0" 6' - 8"
03 A 3' - 0" 3' - 0" 6' - 8" 2
04 A 5' - 0" 4' - 0" 6' - 8" 1
05 A 4' - 0" 1' - 6" 6' - 8" 2, 4
06 A 5' - 0" 4' - 0" 6' - 8" 1

WINDOW SCHEDULE

DOOR SCHEDULEDOOR LEGEND
SCALE: 1/4" = 1'-0"A3-101
FLOOR PLAN WITH COVERED FRONT PORCH - CALIFORNIA RANCH1 SCALE: 1/4" = 1'-0"A3-101
OPTION - NO COVERED FRONT PORCH3
SCALE: 1/4" = 1'-0"A3-101
COVERED FRONT PORCH - SPANISH COLONIAL2
DATE
SHEET

THESE PLANS ARE PROVIDED BY THE CITY OF ANTIOCH AS

PART OF THE PRE-APPROVED ADU PROGRAM AND ARE
PUBLIC DOMAIN. THERE CANNOT BE A CHARGE TO
PROVIDE THESE PLANS. NO ALTERATIONS TO THESE PLANS
ARE ALLOWED. ALL ALTERATIONS MUST BE DONE UNDER A

SEPARATE PERMIT ONCE THE BUILDING PERMIT FOR THE

ADU HAS BEEN ISSUED AND FINAL INSPECTION
COMPLETED. IF YOU DO NOT HAVE THE CONSTRUCTION

KNOWLEDGE AND EXPERIENCE TO CONSTRUCT THESE

PLANS WITHOUT FURTHER DETAILS, IT IS RECOMMENDED
YOU HIRE A CONTRACTOR TO DO THE CONSTRUCTION.

THE CITY WILL NOT PROVIDE FURTHER INFORMATION OR

DETAILS AND BUILDING INSPECTORS WILL NOT PROVIDE
STEP BY STEP INSTRUCTIONS IN THE FIELD.

NO. REVISION DATE
Autodesk Docs://3981-01_Antioch ADU/3981-01_Antioch ADUs - Composite Model.rvt 8/19/2026 12:06:58 PM
FLOOR PLAN 3

PRE-APPROVED ADU

CITY OF ANTIOCH
A3-101
08/19/26

PUBLIC SET
A03 30" WIDE FREE STANDING ELECTRIC RANGE OVEN. VENT TO EXTERIOR, STAINLESS STEEL.

A05 REFRIGERATOR LOCATION. PROVIDE 36" SPACE WITH ROUGH PLUMBING FOR ICE MAKER (RECESS IN WALL) OR PER OWNER'S SPECIFICATIONS.

A06 24" WIDE FRONT CONTROL UNDERCOUNTER DISHWASHER.

A07 STACKED WASHER/DRYER MACHINE LOCATION. PROVIDE WASTE AND WATER IN RECESSED WALL BOX. PROVIDE DRYER VENT. VENT TO OUTSIDE AIR.

B02 30" SINGLE COMPARTMENT UNDER-MOUNT KITCHEN SINK W/ GARBAGE DISPOSAL. REFER TO WATER EFFICIENCY REQUIREMENTS ON CALGREEN CODE NOTES SHEET.

B04 LAVATORY SINK. REFER TO WATER EFFICIENCY REQUIREMENTS ON CALGREEN CODE NOTES SHEETS.

B06 32" x 60" x 72" TUB AND SHOWER COMBINATION. MODEL BY BUILDER.

PROVIDE SHOWER ROD.

B12 WATER CLOSET. REFER TO WATER EFFICIENCY REQUIREMENTS ON CALGREEN CODE NOTES SHEETS. WATER CLOSET SHALL NOT BE SET CLOSER THAN 15" FROM ITS CENTER TO A SIDE WALL OR OBSTRUCTION PER CPC, SECTION 402.5.

B14 40 GALLON TANK WATER HEATER. REFER TO TITLE 24 FOR ADDITIONAL INFORMATION.

B16 ELECTRIC PANEL LOCATION. PROVIDE PROTECTION PER CPC 507.25 & CMC 305.1.1, SEE GENERAL MEP NOTES 7 & 8 ON SHEET A-111 FOR MORE INFO.

B17 MULTI-ZONE HEAT PUMP CONDENSER UNIT. REFER TO PLANS FOR LOCATION OF INDOOR FAN COIL UNITS. REFER TO TITLE 24 FOR ADDITIONAL INFORMATION. PROVIDE CONCRETE PAD MIN. 6" LARGER THAN UNIT IN EACH DIRECTION, 3" MIN. ABOVE GRADE. PROVIDE PROTECTION PER CPC 507.25 & CMC 305.1.1, SEE GENERAL MEP NOTES 7 & 8 ON SHEET A-111 FOR MORE INFO. SEE DETAIL 53/A-902.

B18 FAN COIL @ 80" A.F.F. TO BOTTOM OF UNIT, PROVIDE DEDICATED WALL

OUTLET, INSTALL PER MANUFACTERER'S SPECIFICATIONS, REFER TO PLANS FOR LOCATION OF OUTDOOR CONDENSING UNIT. REFER TO TITLE 24 FOR ADDITIONAL INFORMATION.

C01 SINGLE WOOD SHELF AND POLE.

C04 36" HIGH BASE CABINET AND COUNTERTOP.

C08 24" DEEP UPPER CABINET.

C12 22" DEEP VANITY
G03 CONCRETE LANDING. SLOPE 1/4"/FT AWAY FROM THE BUILDING. MUST BE AT LEAST AS WIDE AS DOOR AND 3' DEEP.

M02 DOWNSPOUT TO SPLASH BLOCK BELOW. SEE DETAIL 23/A-901.

KEYNOTES

1. 2.

3. 4.

5. 6.

7. 8.

9. 10.

11. 12.

13. 14.

REFER TO GENERAL NOTES SHEET G-101 AND G-102 FOR ADDITIONAL REQUIREMENTS.

REFER TO STRUCTURAL PLANS FOR FURTHER INFORMATION.

REFER TO MECHANICAL PLANS FOR FURTHER INFORMATION.

REFER TO ELECTRICAL PLANS FOR FURTHER INFORMATION.

REFER TO PLUMBING PLANS FOR FURTHER INFORMATION.

ALL FURNITURE AND EQUIPMENT IS BY OWNER AND IS SHOWN FOR COORDINATION PURPOSES ONLY.

DIMENSIONS ARE TO FACE OF SHEATHING UNLESS SPECIFICALLY NOTED OTHERWISE.

PROVIDE ADEQUATE BLOCKING IN WALLS FOR CABINETS AND OTHER WALL

MOUNTED ACCESSORIES INCLUDING BUT NOT LIMITED TO HANDRAILS, SHELVING AND BATHROOM FIXTURES.

DOOR AND WINDOW DIMENSIONS ARE CENTERED AT OPENINGS.

WHERE DOOR IS LOCATED WITHOUT DIMENSION AT THE CORNER OF A ROOM IT SHALL BE 4" FROM FACE OF FRAMING OF ADJACENT WALL TO ROUGH DOOR OPENING.

WHERE RECESSED FIXTURES OCCUR IN WALLS OR HORIZONTAL

ASSEMBLIES, THE FIRE RATING OF THOSE ASSEMBLIES SHALL BE MAINTAINED.

AT ALL PENETRATIONS AND INTERSECTIONS OF FIRE-RATED PARTITIONS,

PROVIDE FIRE SEALANT AND/OR FIRE STOPPING TO MAINTAIN CONTINUITY OF PARTITION RATING.

PER 2025 CRC R318.3 FLOORS OR LANDINGS AT EXTERIOR DOORS SHALL BE

AT LEAST AS WIDE AS DOOR SERVED AND SHALL PROVIDE A LENGTH IN THE DIRECTION OF TRAVEL EQUAL TO 36 INCHES MINIMUM. SLOPE OF EXTERIOR LANDINGS SHALL NOT EXCEED 1/4" PER FOOT (2% SLOPE).

PER 2025 CRC 328.1.1 REINFORCEMENT FOR GRAB BARS SHALL BE PROVIDED IN AT LEAST ONE BATHROOM. 1. REINFORCEMENT SHALL BE

SOLID LUMBER OR OTHER CONSTRUCTION MATERIALS APPROVED BY THE ENFORCING AGENCY. 2. REINFORCEMENT SHALL NOT BE LESS THAN 2X8 INCH NOMINAL LUMBER OR OTHER MATERIAL PROVIDING EQ. HT. AND CAPACITY. REINFORCEMENT ABOVE THE FINISHED FLOOR FLUSH WITH THE WALL FRAMING. 3. WATER CLOSET REINFORCEMENT SHALL BE INSTALLED

ON BOTH SIDE WALLS OF THE FIXTURE, OR ONE SIDE WALL AND THE BACK WALL. 4. SHOWER REINFORCEMENT SHALL BE CONTINUOUS WHERE WALL FRAMING IS PROVIDED. 5. BATHTUB AND COMBINATION BATHTUB/SHOWER

REINFORCEMENT SHALL BE CONTINUOUS ON EACH END OF THE BATHTUB AND THE BACK WALL. ADDITIONALLY, BACK WALL REINFORCEMENT FOR A

LOWER GRAB BAR SHALL BE PROVIDED WITH THE BOTTOM EDGE LOCATED NO MORE THAN 6 INCHES ABOVE THE BATHTUB RIM. REFER TO SHEET A-903 FOR MORE INFORMATION.

FLOOR PLAN GENERAL NOTES
SCALE: 1/4" = 1'-0"A3-101
COVERED FRONT PORCH - MID-CENTURY MODERN4

1. 2.

3. 4.

5. 6.

REFER TO FLOOR PLANS FOR WINDOW LOCATIONS.

CONTRACTOR TO VERIFY EXACT ROUGH OPENING SIZES PRIOR TO FABRICATION OF ROUGH OPENINGS.

ALL GLAZING IS DOUBLE PANE UNLESS OTHERWISE NOTED.

EGRESS WINDOWS SHALL HAVE A CLEAR OPENING WITH THE BOTTOM OF THE CLEAR OPENING NOT GREATER THAN 44" AFF, MIN. NET CLEAR OPENING FOR EMERGENCY ESCAPE SHALL BE 5.7 S.F. EXCEPT: 5 S.F. MIN. AT GROUND FLOOR. MINIMUM NET CLEAR OPENING DIMENSIONS: HEIGHT: 24", WIDTH: 20". (2025 CRC SEC. R319.2) EMERGENCY ESCAPE AND RESCUE OPENINGS SHALL OPEN DIRECTLY INTO A PUBLIC WAY PER 2025 CRC, SECTION 319.1.

GLAZING IN WALLS ADJACENT TO BATHTUB / SHOWER WHERE THE BOTTOM EXPOSED EDGE OF THE GLAZING IS LESS THAN 60" MEASURED VERTICALLY ABOVE ANY STANDING OR WALKING SURFACE SHALL BE SAFETY GLAZING. (2025 CRC SEC. R324.4.5)

REFER TO WINDOW SCHEDULE AND WINDOW LEGEND FOR MORE
INFORMATION.

WINDOW GENERAL NOTES

7. IF STRUCTURE IS IN A WUI ZONE OR FHSZ, WINDOW MUST COMPLY WITH

BE CONSTRUCTED OF MULTI-PANE GLAZING WITH A MINIMUM OF ONE TEMPERED PANE (2025 CWUIC SEC. 504.8)

8. REFER TO ENERGY COMPLIANCE REPORTS TO VERIFY U-FACTOR, SHGC AND ADDITIONAL WINDOW REQUIREMENTS. ALL OPENINGS TO BE
U-FACTOR = (.27) , SHGC = (.23). BUG SCREEN REQUIRED (PER TITLE 24).

1. 2.

3. 4.

REQUIRED EGRESS WINDOW. REFER TO WINDOW GENERAL NOTE #4 FOR ADDITIONAL INFORMATION.

WINDOW INCLUDES BOTH PANES TEMPERED GLAZING.

OPTIONAL WINDOW. SEE TITLE SHEET FOR SELECTIONS FOR MORE INFO. AT

LEAST ONE EGRESS OPENING REQUIRED AT ALL BEDROOMS, SEE GENERAL WINDOW NOTE #5 FOR EGRESS REQUIREMENTS.

REQUIRED TO PROVIDE OBSCURE / PRIVACY GLASS.

WINDOW REMARKS

1. 2.

3. 4.

5. A.

6. REFER TO PLANS FOR LOCATION OF DOORS.

VERIFY ROUGH OPENING SIZE WITH DOOR MANUFACTURER SPECIFICATIONS PRIOR TO CONSTRUCTION.

CONTRACTOR TO VERIFY ACTUAL DOOR SIZE TO FIT FINISH OPENING PRIOR TO FABRICATION OF DOOR AND FINISH OPENING.

FIRE RATED DOORS SHALL BE SOLID WOOD OR SOLID HONEYCOMB CORE STEEL DOOR 1-3/8" THICK OR COMPLIANT WITH 2025 CRC SECTION R302.5.1.

DOORS SHALL BE SELF-CLOSING AND SELF-LATCHING WITH WEATHER STRIPPING TO BE TIGHT FITTING.

EXTERIOR DOORS SHALL EITHER HAVE A FIRE-RESISTANCE RATING OR MUST COMPLY WITH THE FOLLOWING REQUIREMENTS:

STILES AND RAILS SHALL NOT BE LESS THAN 1-3/8" THICK.

PANELS SHALL NOT BE LESS THAN 1-1/4" THICK, EXCEPT FOR THE

EXTERIOR PERIMETER OF THE PANEL SHALL BE PERMITTED TO TAPER TO A TONGUE OF NOT LESS THAN 3/8" THICK.

GLAZING IN DOORS SHALL BE TEMPERED PER 2025 CRC SECTION R324.4.1.

PANES INDICATED IN DOOR LEGEND WITH (T).

8. ALL EMERGENCY ESCAPE AND RESCUE OPENINGS SHALL BE MAINTAINED

FREE OF ANY OBSTRUCTIONS OTHER THAN THOSE ALLOWED BY THIS

SECTION AND SHALL BE OPERATIONAL FROM THE INSIDE OF THE ROOM WITHOUT THE USE OF KEYS, TOOLS, OR SPECIAL KNOWLEDGE. 2025 CRC R319.1.1.

DOOR GENERAL NOTES

1. 2.

3. 4.

5. EXTERIOR DOOR.

GLAZING PER DOOR TYPES. REFER TO GENERAL DOOR NOTE #6
OPTIONAL DOOR. SEE TITLE SHEET FOR SELECTIONS FOR MORE INFO.

REQUIRED OPENING OF NOT LESS THAN 100 IN
2 FOR MAKEUP AIR SHALL BE
PROVIDED IN THE DOOR OR BY APPROVED MEANS. [CMC SEC. R504.4.1]

VENT DOOR AS REQUIRED PER WATER HEATER MANUFACTURER

REQUIREMENTS / SPECIFICATIONS

DOOR REMARKS

WINDOW LEGEND

FOR USE IN CITY OF ANTIOCH ONLY
B33

AFI AFI
AFI
AFI
AFI
AFIAFI
AFI
AFI
AFI
FC
AFI
AFIAFI
240V
GFI 240V
GFI
240V
GFI
GFIGFI
+42"
GFI
+42"
DW
GFI
GFI
+42"
MW
GFI
F
GFI
+42"
240V
GFI
WP
AFI
GFI
+42"
F VS
J J
EXT
+84
3D A
FD
D F
SD/MA
D
D
3D
SD SD
IAQ
FC
FC
AFI
CW
CW
CW
CW CW
CW
IM
HW
HW
HW
HW
IAQ
AFI
240V
GFI
GFI
WP
GFI
J
SD
SD/MA
VS
J
P
VP
EXT
+84
CW
HB
HB
SOV
HW
F
H
MW
GFI
DW
GFI
FC
D
A

IN ATTIC
A05A03
A06
B02
B06
B12
B04 B18
A07B14
HALLWAY CL.

BED 2BATH

KITCHEN/DINING

LAUNDRY
LIVING
CL.

OPT. COVERED

PORCH - CAL RANCH
BED 1
CL
WH
SEE DETAIL:
/54 A-901
B17B16
F02
B06
B12
B04
A05A03B02
A07

HALLWAY
CL.

BED 2
BATH

KITCHEN/DINING

LAUNDRY
LIVING
CL.

BED 1
CL
WH
A06

DUPLEX OUTLET

ARC-FAULT CIRCUIT

INTERRUPTER

DUPLEX OUTLET
240 VOLTS

DUPLEX OUTLET

GROUND FAULT

INTERRUPTER

DUPLEX OUTLET

WATERPROOF

GROUND FAULT

INTERRUPTER

DUPLEX OUTLET

AFCI-HALF HOT

ELECTRICAL

JUNCTION BOX
SMOKE

DETECTOR/ALARM

COMBINATION

SMOKE/CARBON

MONOXIDE
FAN COIL UNIT +80"

TO BOTTOM OF UNIT

PROVIDE DEDICATED
OUTLET

ELECTRICAL
SWITCH

ELECTRICAL

SWITCH-THREE

WAY-DIMMER

ELECTRICAL

SWITCH-

VACANCY
SENSOR

ELECTRICAL

SWITCH-DIMMER

COLD WATER

STUB OUT

HOT WATER STUB
OUT

WATER HOSE BIBB

WITH SHUT OF
VALVE

CEILING FAN OPTIONAL
(PRE WIRE FOR CEILING

FAN ONLY)

INDOOR AIR

QUALITY FAN

PENDANT LIGHT

HIGH-EFFICACY

RECESSED

HIGH- EFFICACY

DOWNLIGHT

RECESSED HIGH- EFFICACY

DOWNLIGHT-VAPOR PROOF

WALL MOUNTED

HIGH-EFFICACY
LIGHT

EXTERIOR WALL

MOUNTED HIGH-

EFFICACY LIGHT W/

PHOTO SENSOR

DUPLEX OUTLET

MICROWAVE

GROUND FAULT

INTERRUPTER

DUPLEX OUTLET

DISH WASHER

GROUND FAULT

INTERRUPTER

ELECTRICAL

SWITCH-FAN

ASTRONOMICAL

TIME OR MOTION

SENSOR SWITCH
(AT LEAST 1 REQ.)

ELECTRICAL
WIRING

EXHAUST FAN

DUPLEX OUTLET

RANGE HOOD
NOTE: IONIZATION
SMOKE DETECTOR 10'

MINIMUM FROM STOVE,
ALL OTHERS 20'MIN

CLEARANCE
3D
NOTE: IONIZATION SMOKE DETECTOR 10' MINIMUM FROM STOVE, ALL OTHERS 20'MIN CLEARANCE
22"X30" MIN. ATTIC ACCESS PANEL (WHERE REQ.)

WHOLE DWELLING UNIT MECHANICAL VENTILATION
PER SECTION 150.0(O)(C)(i) [ASHRAE 62.2:4.1.2]
2 BED - MINIUM CUBIC FEET PER MINUTE (CFM) (Equation 150.0-B) Qtot = 0.03Afloor + 7.5(Nbr + 1) .03(702 SF) + 7.5 (3) = 43.56 CFM < 50 CFM SCALE: 1/4" = 1'-0"A3-111
ELECTRICAL PLAN - PLAN 31
SCALE: 1/4" = 1'-0"A3-111
MECHANICAL PLAN - PLAN 32
LEGEND
A03 30" WIDE FREE STANDING ELECTRIC RANGE OVEN. VENT TO EXTERIOR, STAINLESS STEEL.

A05 REFRIGERATOR LOCATION. PROVIDE 36" SPACE WITH ROUGH PLUMBING FOR ICE MAKER (RECESS IN WALL) OR PER OWNER'S SPECIFICATIONS.

A06 24" WIDE FRONT CONTROL UNDERCOUNTER DISHWASHER.

A07 STACKED WASHER/DRYER MACHINE LOCATION. PROVIDE WASTE AND WATER IN RECESSED WALL BOX. PROVIDE DRYER VENT. VENT TO OUTSIDE AIR.

B02 30" SINGLE COMPARTMENT UNDER-MOUNT KITCHEN SINK W/ GARBAGE DISPOSAL. REFER TO WATER EFFICIENCY REQUIREMENTS ON CALGREEN CODE NOTES SHEET.

B04 LAVATORY SINK. REFER TO WATER EFFICIENCY REQUIREMENTS ON CALGREEN CODE NOTES SHEETS.

B06 32" x 60" x 72" TUB AND SHOWER COMBINATION. MODEL BY BUILDER.

PROVIDE SHOWER ROD.

B14 40 GALLON TANK WATER HEATER. REFER TO TITLE 24 FOR ADDITIONAL INFORMATION.

B16 ELECTRIC PANEL LOCATION. PROVIDE PROTECTION PER CPC 507.25 & CMC 305.1.1, SEE GENERAL MEP NOTES 7 & 8 ON SHEET A-111 FOR MORE INFO.

B18 FAN COIL @ 80" A.F.F. TO BOTTOM OF UNIT, PROVIDE DEDICATED WALL

OUTLET, INSTALL PER MANUFACTERER'S SPECIFICATIONS, REFER TO PLANS FOR LOCATION OF OUTDOOR CONDENSING UNIT. REFER TO TITLE 24 FOR ADDITIONAL INFORMATION.

F02 22" X 30" MINIMUM ATTIC ACCESS. PROVIDED SWITCH AND OUTLET AT ATTIC.

THERE IS NO HVAC EQUIPMENT (SUCH AS FURNACE, HEAT PUMP, OR FAU) IN THE ATTIC. PERMANENTLY ATTACH R-38 OR GREATER INSULATION TO ATTIC ACCESS DOOR USING ADHESIVE OR MECHANICAL FASTENERS CEnC 150.0 (a)1. PROVIDE GASKETED ATTIC ACCESS TO PREVENT AIR LEAKAGE CEnC 150.0 (a)1."

KEYNOTES

VENTILATION SUMMARIES
1) LOCAL EXHAUST VENTILATION

BATHROOM
BATHROOM FAN FLOW (cfm) .............................

DUCT TYPE ...........................................................

DUCT SIZE (in) ......................................................

THIS EXHAUST FAN IS REQUIRED TO BE RATED FOR SOUND AT A MAX. OF 3 SONES.

MAX. ALLOWABLE DUCT LENGTH (ft) ...............

KITCHEN
KITCHEN FAN FLOW (cfm) ..................................

DUCT TYPE ...........................................................

DUCT SIZE (in) ......................................................

MAX. ALLOWABLE DUCT LENGTH (ft) ................
2) WHOLE BUILDING VENTILATION
THIS EXHAUST FAN IS REQUIRED TO BE RATED FOR SOUND AT A MAX. OF 1 SONE.

THIS EXHAUST FAN IS REQUIRED TO OPERATE CONTINUOUSLY TO ENSURE CONTINUOUSLY TO ENSURE INDOOR AIR QUALITY.

PER ASHRAE STANDARD 62.2, CEC EQUATION 150.0-B
THIS EXHAUST FAN IS REQUIRED TO BE RATED FOR SOUND AT A MAX. OF 3 SONES.

BUILDING FAN FLOW (cfm) .............................

DUCT TYPE ...........................................................

DUCT SIZE (in) ......................................................

MAX. ALLOWABLE DUCT LENGTH (ft) ...............

OPTION A OPTION B

OPTION A OPTION B
50 CFM
4"
70'
160 CFM
7"
35'
50 CFM
4"
70'

FLEX DUCT

FLEX DUCT
50 CFM
4"
105'
50 CFM

SMOOTH DUCT

SMOOTH DUCT
9"
85'
50 CFM

SMOOTH DUCT
4"
105'
REFER TO T-24 FOR IAQ VENTILATION
DATE
SHEET

THESE PLANS ARE PROVIDED BY THE CITY OF ANTIOCH AS

PART OF THE PRE-APPROVED ADU PROGRAM AND ARE
PUBLIC DOMAIN. THERE CANNOT BE A CHARGE TO
PROVIDE THESE PLANS. NO ALTERATIONS TO THESE PLANS
ARE ALLOWED. ALL ALTERATIONS MUST BE DONE UNDER A

SEPARATE PERMIT ONCE THE BUILDING PERMIT FOR THE

ADU HAS BEEN ISSUED AND FINAL INSPECTION
COMPLETED. IF YOU DO NOT HAVE THE CONSTRUCTION

KNOWLEDGE AND EXPERIENCE TO CONSTRUCT THESE

PLANS WITHOUT FURTHER DETAILS, IT IS RECOMMENDED
YOU HIRE A CONTRACTOR TO DO THE CONSTRUCTION.

THE CITY WILL NOT PROVIDE FURTHER INFORMATION OR

DETAILS AND BUILDING INSPECTORS WILL NOT PROVIDE
STEP BY STEP INSTRUCTIONS IN THE FIELD.

NO. REVISION DATE
Autodesk Docs://3981-01_Antioch ADU/3981-01_Antioch ADUs - Composite Model.rvt 8/19/2026 12:06:59 PM

MECHANICAL & ELECTRICAL
PLANS

PRE-APPROVED ADU

CITY OF ANTIOCH
A3-111
08/19/26

PUBLIC SET

ELECTRICAL NOTES

1. 2.

3. 4.

5. 6.

7. 8.

9. 10.

11. 12.

13. 14.

15. 16.

17. 18.

19. 20.

21. CONFORM WITH CURRENT CEC, NFPA, MFR'S, AND LOCAL REQUIREMENTS.

ELECTRICAL SYSTEM GROUND TO BE PROVIDED PER NEC ARTICLE 250-81.

ALL MATERIALS TO BE U.L. LABELED.

METER: "SQUARE D", 120 VOLT/ 240 VOLT, 1 AND 3 WIRE GROUND OR EQUAL.

ELECTRICAL SUB PANEL: FLUSH MOUNT, 30" CLEARANCE. SEE TITLE SHEET FOR PANEL OPTIONS.

CONDUCTORS: TW, THW, COPPER, MINIMUM 14 AT LIGHTING, 12 AT OTHER CIRCUITS.

ALL LUMINARIES SHALL COMPLY WITH 2025 CEC SECTION 150.0 (K) AND TABLE 150.0-A AS REFERENCED IN ENERGY NOTES, LUMINAIRE
REQUIREMENTS SHEET G-101.

ALL ELECTRICAL OUTLETS INSTALLED IN BATHROOMS, GARAGES,

BASEMENTS, CRAWL SPACES, OUTDOORS, KITCHEN COUNTERS, AND AT

WET BAR SINKS SHALL HAVE GROUND-FAULT CIRCUIT-INTERRUPTER PROTECTION IN COMPLIANCE WITH NEC Art. 210-8, CONSISTING OF 125 VOLT,
SINGLE-PHASE, 15- AND 20- AMPERE RECEPTACLES.

ALL BATHROOM RECEPTACLE OUTLETS SHALL BE SUPPLIED BY A MINIMUM OF ONE 120-VOLT, 20-AMPERE BRANCH CIRCUIT. SUCH CIRCUITS SHALL HAVE NO OTHER OUTLETS. THIS DEDICATED CIRCUIT MAY SERVE MORE THAN ONE BATHROOM. (2025 CEC 210.11(C))
THERMOSTAT SHALL BE A PROGRAMMABLE TYPE, HONEYWELL TH8320 OR EQUAL.

CEILING-SUSPENDED (PADDLE) FANS SHALL BE SUPPORTED

INDEPENDENTLY OF AN OUTLET BOX OR BY LISTED OUTLET BOX OR OUTLET

BOX SYSTEMS IDENTIFIED FOR THE USE AND INSTALLED IN ACCORDANCE WITH 2025 CEC 314.27(C) (2025 CEC 422.18).

ALL LUMINARIES, LAMPHOLDERS, AND RETROFIT KITS SHALL BE LISTED (2025 CEC 410.6).

ALL 120-VOLT, SINGLE PHASE 15- AND 20- AMPERE BRANCH CIRCUITS

SUPPLYING OUTLETS INSTALLED IN DWELLING UNIT KITCHENS, FAMILY

ROOMS, LIVING ROOMS, DINING ROOMS, PARLORS, LIBRARIES, DENS,

BEDROOMS, SUNROOMS, RECREATION ROOMS, CLOSETS, HALLWAYS OR

SIMILAR ROOMS OR AREAS SHALL BE PROTECTED BY A LISTED ARC-FAULT

CIRCUIT INTERRUPTER, COMBINATION-TYPE, INSTALLED TO PROVIDE PROTECTION OF THE BRANCH CIRCUIT. (2025 CEC 210-12(A)).

ALL NON-LOCKING TYPE 125-VOLT, 15 AND 20 AMPERE RECEPTACLES IN A DWELLING UNIT SHALL BE LISTED TAMPER-RESISTANT RECEPTACLES.

EXCEPTIONS: (1) RECEPTACLES MORE THAN 5’6” ABOVE THE FLOOR, (2) RECEPTACLES PART OF A LUMINAIRE OR APPLIANCE, (3) A SINGLE

RECEPTACLE OR A DUPLEX RECEPTACLE FOR TWO APPLIANCES THAT ARE

NOT EASILY MOVED AND LOCATED WITHIN DEDICATED SPACE AND ARE CHORD-AND-PLUG CONNECTED AS PER CEC 400.10, AND (4) NON-

GROUNDING RECEPTACLES USED FOR REPLACEMENTS AS PERMITTED IN 2025 CEC 406.4(D)(2)(A).

HIGH EFFICACY LUMINAIRES OTHER THAN OUTDOOR HID LIGHTING CONTAIN ONLY HIGH EFFICACY LAMPS AS OUTLINED IN TABLE 150-C OF THE

RESIDENTIAL ENERGY CODE AND NOT CONTAIN A MEDIUM SCREW BASE SOCKET.

BALLAST FOR LAMPS 13 WATTS OR GREATER SHALL BE ELECTRONIC AND HAVE AN OUTPUT FREQUENCY NO LESS THAT 20 kHz.

SMOKE DETECTORS SHALL RECEIVE THEIR PRIMARY POWER FROM THE BUILDING WIRING AND PROVIDED WITH A BATTERY BACK-UP. ALL SMOKE DETECTORS SHALL BE INTERCONNECTED. ALL SMOKE DETECTORS SHALL MAINTAIN A MINIMUM 3 FOOT CLEARANCE TO HVAC SUPPLY OR RETURN AIR REGISTERS.

CARBON MONOXIDE ALARMS SHALL RECEIVE THEIR PRIMARY POWER FROM THE BUILDING WIRING AND PROVIDED WITH A BATTERY BACK-UP. ALL CARBON MONOXIDE ALARMS SHALL BE INTERCONNECTED.

EXHAUST FANS WILL BE CONTROLLED BY A HUMIDISTAT PER THE GREEN BUILDING STANDARDS CODE SECTION 4.506. EXHAUST FANS MUST BE SWITCHED SEPARATELY FROM LIGHTS (2025 CEnC 150.0(k)2G).

IN ADDITION TO THE NUMBER OF BRANCH CIRCUITS REQUIRED BY OTHER PARTS OF THE CODE, TWO OR MORE 20-AMPERE SMALL-APPLIANCE

BRANCH CIRCUITS SHALL BE PROVIDED FOR ALL RECEPTACLE OUTLETS IN

THE KITCHEN, PANTRY, BREAKFAST ROOM, DINING ROOM, OR SIMILAR AREA PER 2025 CEC, ARTICLE 210.11 (C)(1). THE CIRCUITS SHALL HAVE NO OTHER OUTLETS PER 2025 CEC, ARTICLE 210.52(B).

IN ADDITION TO THE NUMBER OF BRANCH CIRCUITS REQUIRED BY OTHER PARTS OF THE CODE, AT LEAST ONE ADDITIONAL 20-AMPERE BRANCH

CIRCUIT SHALL BE PROVIDED TO SUPPLY THE LAUNDRY RECEPTACLE OUTLET(S) REQUIRED BY 2025 CEC, ARTICLE 210.52 (F). THIS CIRCUIT SHALL HAVE NO OTHER OUTLETS PER 2025 CEC, ARTICLE 201.11(C)(2).

1. 2.

3. 4.

5. 6.

7. 8.

9. 10.

REFER TO ELECTRICAL NOTES ON SHEET G-101.

REFER TO MECHANICAL NOTES ON SHEET G-101.

REFER TO PLUMBING NOTES ON SHEET G-101.

REFER TO TITLE 24 COMPLIANCE NOTES ON SHEET G-102.

EXTERNALLY MOUNTED HEATING/COOLING UNITS SHALL BE SCREENED IF THEY ARE VISIBLE FROM A PUBLIC STREET.

ENVIRONMENTAL AIR DUCT EXHAUST SHALL TERMINATE NOT LESS THAN 3 FT FROM WALL OPENINGS. CMC 502.2.1.

APPLIANCES NOT LISTED FOR OUTDOOR INSTALLATION BUT INSTALLED

OUTDOORS SHALL BE PROVIDED WITH PROTECTION TO THE DEGREE THAT THE ENVIRONMENT REQUIRES. APPLIANCES LISTED FOR OUTDOOR

INSTALLATION SHALL BE PERMITTED TO BE INSTALLED WITHOUT

PROTECTION IN ACCORDANCE WITH THE PROVISIONS OF ITS LISTING AND THE MANUFACTURER'S INSTALLATION INSTRUCTIONS PER CPC 507.24 PROTECTION OF OUTDOOR APPLIANCES.

APPLIANCES INSTALLED IN GARAGES, WAREHOUSES, OR OTHER AREAS SUBJECT TO MECHANICAL DAMAGE SHALL BE AT LEAST 18" ABOVE THE

FLOOR AND GUARDED AGAINST SUCH DAMAGE BY BEING INSTALLED BEHIND

PROTECTIVE BARRIERS OR BY BEING ELEVATED OR LOCATED OUT OF THE NORMAL PATH OF VEHICLES PER CMC 305.1.1 PHYSICAL DAMAGE.

INSTALLED AIR CONDITIONER AND HEAT PUMP SYSTEMS SHALL HAVE A CLEARANCE OF AT LEAST FIVE (5) FEET FROM THE OUTLET OF ANY DRYER VENT. CEnC2025 150.0 (H) 3.

INSTALLED AIR CONDITIONER AND HEAT PUMP SYSTEMS SHALL BE EQUIPPED

WITH LIQUID LINE DRIERS IF REQUIRED, AS SPECIFIC BY MANUFACTURER'S INSTRUCTIONS. CEnC2025 150.0 (H) 3.

11. ASSEMBLIES AT EXTERIOR WINDOW AND DOOR HEADERS IN 2X6 EXTERIOR WALLS SHALL BE R-5 MINIMUM PER 2025 SINGLE-FAMILY RESIDENTIAL

MANDATORY REQUIREMENTS

GENERAL MEP NOTES

PLUMBING NOTES
•
•

1. WATER HEATER
REFER TO T-24 ENERGY REPORT FOR REQUIRED PRODUCT. SEE SHEET A-930 FOR PRODUCT REFERENCE SHEETS.

WATER HEATER SHALL FOLLOW FIRST HOUR RATINGS REQUIRED IN TABLE PER 2025 CPC TABLE 501.1(2).

A. ALL DOMESTIC HOT WATER PIPING SHALL BE INSULATED. (2025 CPC 609.12.1)
PIPES UP TO 2 INCHES IN DIAMETER: INSULATION WALL THICKNESS NOT LESS THAN DIAMETER OF PIPE. (2025 CPC 609.12.2)
PIPES GREATER THAN 2 INCHES IN DIAMETER: INSULATION WALL THICKNESS NOT LESS THAN 2 INCHES. (2025 CPC 609.12.2)
EXCEPTIONS:

1. PIPING THAT PENETRATES FRAMING MEMBERS SHALL NOT BE

REQUIRED TO HAVE PIPE INSULATION FOR THE DISTANCE OF THE FRAMING PENETRATION. (2025 CPC 609.12.2)

2. HOT WATER PIPING BETWEEN THE FIXTURE CONTROL VALVE OR

SUPPLY STOP AND THE FIXTURE OR APPLIANCE SHALL NOT BE
REQUIRED TO BE INSULATED. (2025 CPC 609.12.2)
B. PROVIDE A TEMPERATURE AND PRESSURE RELIEF VALVE WITH A FULL

SIZE DRAIN OF GALVANIZED STEEL OR HARD DRAWN COPPER TO THE OUTSIDE OF THE BUILDING WITH THE END OF THE PIPE PROTRUDING 6" MINIMUM @ 2' MAX. ABOVE GRADE POINTING DOWNWARD TO THE TERMINATION - UNTHREADED.

C. COMBUSTION AIR PER MANUFACTURE REQUIREMENTS.

D. CLEARANCES PER MANUFACTURE REQUIREMENTS.

NOTE: KITCHEN RANGE HOOD (CEC 2025) PER TABLE 150.0-G ARIFLOW RATES (CFM) AND ASTM E3087 <750 SF = 65% CE OR 160 CFM, 750 SF-1000 SF = 55% CE OR 130 CFM EFFECTIVE ANNUAL AVERAGE INFILTRATION RATE PER SECTION 150.0(O)(C)(ii) a. 1. (Equation 150.0-C) Q50 = Vdu (x) 2 ACH50 / 60minutes a. 2. (Equation 150.0-D) Q50 = Vdu (x) Verified ACH50 / 60minutes b. (Equation 150.0-E) Qtot = 0.052 (x) Q50 x wsf x [H/Hr]^z [ASHRAE 62.2:4.1.2.1] REQUIRED MECHANICAL VENTILATION RATE PER 150.0(O)(C)(iii) [ASHRAE 62.2:4.1.2] (Equation 150.0-F) Qfan = Qtot (-) ϕ (Qinf (x) Aext)

FOR USE IN CITY OF ANTIOCH ONLY
B34
A
A
1 1
2 2
B
B
5" / 1'-0" 5" / 1'-0"
306 SF
264 SF
30 SF30 SF
TYP.
1' - 0" EAVE
TYP.
1' - 0" RAKE
RIDGE
VALLEY
VALLEY
RIDGE
32 A-911
________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ 31 A-911
________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ 23 A-911
________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ 23 A-911
________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ M01 M02
K09
L01
H10
H09
A
2 5" / 1'-0"
5" / 1'-0" 5" / 1'-0"
RIDGE
TYP.
1' - 0" EAVE
TYP.
1' - 0" RAKE
VALLEY
VALLEY

CEILING HEIGHT (SEE PLAN FOR ACTUAL HEIGHTS)
XX'-X"

ROOF PLAN & RCP LEGEND
X" / 12" ROOF SLOPE (REFER TO PLANS FOR ACTUAL SLOPE)

ROOF VENT, SEE ROOF VENTING CALCULATIONS

OUTLINE OF WALL BELOW
GUTTER, CONNECT TO DOWNSPOUT; SEE DETAIL:

APPROXIMATE LOCATION OF DOWNSPOUT/LEADER TO ROOF
OR SPLASHBLOCK BELOW; SEE DETAILS:

AVAILABLE SOLAR ZONE LOCATIONS; PV SYSTEM UNDER
SEPERATE PERMIT. SEE TITLE SHEET AND TITLE 24 REPORT
FOR MORE INFORMATION. SEE "SETBACK AT RIDGE TABLE"
XX SF
AREA OF ATTIC WITH 30" HEIGHT OR GREATER. 22" X 30" CLEAR OPENING ACCESS REQUIRED IF TOTAL AREA GREATER THAN 30
SQ. FT. PER CRC R807.1
22"X30" MIN. ATTIC ACCESS PANEL (WHERE REQ.)
DOWNSPOUT. SEE DETAIL:DS /23 A-901

MATERIALS LEGEND
INTERIOR CEILING FINISH, TYP. 5/8" GYP.

INSTALL PER MFR RECOMMENDATIONS
NOTE: VISIT GYPSUM.ORG FOR MORE INFORMATION.

1. 2.

3. NOTES:

SOFFIT MATERIALS TO MEET REQ. OF CBC.

INSTALL ALL MATERIALS, FASTENERS, & COMPONENTS PER MANUFACTURER'S

SPECIFICATIONS & RECOMMENDATIONS

INSTALL ADDITIONAL BLOCKING AS NEEDED TO MEET ATTACHMENT REQUIREMENTS PER CBC 701A

A PROJECT SITE WITHIN THE WILDLAND-URBAN INTERFACE FIRE AREA SHALL COMPLY WITH THE CBC 701A. IF WUI APPROVED PRODUCTS ARE REQUIRED, PROVIDE

SELECTED PRODUCT LISTINGS ON THE PRE-APPROVED ADU PROGRAM - OPTION

SELECTION HANDOUT (PAADU)
ROOFING; SEE PRE-APPROVED ADU PROGRAM - OPTION SELECTION HANDOUT (PAADU) FOR SELECTION & MORE INFORMATION. REFER TO TITLE SHEET TO VERIFY WUI REQUIREMENTS ARE APPLICABLE.

A) TONGUE & GROOVE (SOLID SAWN LUMBER)

B) FIBER CEMENT
C) EXT. GRADE FIRE RETARDANT TREATED SHEATHING
(LABEL SELECTION ON REFLECTED CEILING PLAN)
EXTERIOR SOFFITS, RAKES, & EAVES. SEE PRE-APPROVED ADU

PROGRAM - OPTION SELECTION HANDOUT (PAADU)
ASPHALT SHINGLE ROOF; ROOF REFLECTANCE (0.1) MIN. ROOF
EMITTANCE (0.85) MIN. SEE PRE-APPROVED ADU PROGRAM - OPTION

SELECTION HANDOUT (PAADU)
X: SETBACK AT RIDGE TABLE

PV ARRAYS PERCENT OF THE PLAN

VIEW TOTAL ROOF AREA
(X)

HORIZONTAL RIDGE SETBACK
≤33%
>33%
>66% + 12D SPRINKLER
≤66% + 13D SPRINKLER
18" BOTH SIDES OF RIDGE
36" BOTH SIDES OF RIDGE
36" BOTH SIDES OF RIDGE
18" BOTH SIDES OF RIDGE

ROOF VENTING CALCULATIONS

1. 2.

3. WUI REQUIRED? (SEE G-001)

A) NO, MAY USE OPTION A OR C

B) YES, MUST USE FIRE & ICE OPTION B OR OTHER WUI COMPLIANT VENTS UPPER & LOWER VENTS FOR COMPOSITE SHINGLE ROOFING:

A) O'HAGIN TAPERED LOW PROFILE COMPOSITION SHINGLE.

72.0 SQ.IN OF AIR MOVEMENT PER VENT = 72. SQ.IN. / 144 = 0.5 SF (SEE 22/A-921 FOR PRODUCT REFERENCE)
"UPPER VENTS PROVIDED" = (TOTAL ATTIC AREA/300) * (0.5) / (0.5 SF) "LOWER VENTS PROVIDED" = (TOTAL ATTIC AREA/300) * (0.5) / (0.5 SF) B) O'HAGIN FIRE & ICE TAPERED LOW PROFILE COMPOSITION SHINGLE.

64.8 SQ.IN OF AIR MOVEMENT PER VENT = 65.8 SQ.IN. / 144 = 0.45 SF (SEE 22/A-921 FOR PRODUCT REFERENCE)
"UPPER VENTS PROVIDED" = (TOTAL ATTIC AREA/300) * (0.5) / (0.45 SF) "LOWER VENTS PROVIDED" = (TOTAL ATTIC AREA/300) * (0.5) / (0.45 SF)

C) ALTERNATIVE PRODUCT, MUST BE EQUAL TO PRODUCT ABOVE, AND PROVIDE GREATER THAN OR EQUAL AIR MOVEMENT.

ROOF VENTING SHALL COMPLY WITH CRC R806 & CBC 701A.

ENCLOSED ATTICS AND ENCLOSED RAFTER SPACES FORMED WHERE CEILINGS

ARE APPLIED DIRECTLY TO THE UNDERSIDE OF ROOF RAFTERS SHALL HAVE

CROSS VENTILATION FOR EACH SEPARATE SPACE BY VENTILATING OPENINGS PROTECTED AGAINST THE ENTRANCE OF RAIN OR SNOW. VENTILATION OPENINGS SHALL HAVE A LEAST DIMENSION OF 1/16 INCH MINIMUM AND 1/4 INCH MAXIMUM. OPENINGS IN ROOF FRAMING MEMBERS SHALL CONFORM TO THE REQUIREMENTS OF SECTION R802.7. REQUIRED VENTILATION OPENINGS SHALL

OPEN DIRECTLY TO THE OUTSIDE AIR AND SHALL BE PROTECTED TO PREVENT THE ENTRY OF BIRDS, RODENTS, SNAKES AND OTHER SIMILAR CREATURES.

THE MINIMUM NET FREE VENTILATING AREA SHALL COMPLY WITH CRC R806.2. *OWNER/APPLICANT REQ. TO SELECT ONE THE FOLLOWINGA
A
1 1
2 2
B
B

HALLWAY
CL.

BED 2
BATH

KITCHEN/DINING

LAUNDRY
LIVING
CL.

BED 1
CL
WH
8' - 0"
OPT. COVERED

PORCH - CAL RANCH
8' - 0"
F02
A
2 KITCHEN/DININGLAUNDRY LIVINGWH
8' - 0"

VENT TYPE COUNT VENT LENGTH

NET FREE

AREA PER
VENT

PROVIDED

NET FREE
AREA
LOWER

O'HAGIN SHINGLE ROOF VENT
(LOWER)
3 2' - 8" 0.50 SF 1.50 SF
UPPER

O'HAGIN SHINGLE ROOF VENT
(UPPER)
3 2' - 8" 0.50 SF 1.50 SF

3.00 SF

ATTIC AREA

REQUIRED ATTIC

VENTING (NFA)

UPPER VENTING

REQUIRED (NFA)

LOWER VENTING

REQUIRED (NFA)
ATTIC 1 645 SF 2.15 SF 1.07 SF 1.07 SF
SCALE: 1/4" = 1'-0"A3-121
ROOF PLAN - CALIFORNIA RANCH1
VENTING NEEDED (BASED ON OPTION A):

VENTING PROVIDED (BASED ON OPTION A):

SCALE: 1/4" = 1'-0"A3-121

ROOF PLAN - NO COVERED
PORCH OPTION2
DATE
SHEET

THESE PLANS ARE PROVIDED BY THE CITY OF ANTIOCH AS

PART OF THE PRE-APPROVED ADU PROGRAM AND ARE
PUBLIC DOMAIN. THERE CANNOT BE A CHARGE TO
PROVIDE THESE PLANS. NO ALTERATIONS TO THESE PLANS
ARE ALLOWED. ALL ALTERATIONS MUST BE DONE UNDER A

SEPARATE PERMIT ONCE THE BUILDING PERMIT FOR THE

ADU HAS BEEN ISSUED AND FINAL INSPECTION
COMPLETED. IF YOU DO NOT HAVE THE CONSTRUCTION

KNOWLEDGE AND EXPERIENCE TO CONSTRUCT THESE

PLANS WITHOUT FURTHER DETAILS, IT IS RECOMMENDED
YOU HIRE A CONTRACTOR TO DO THE CONSTRUCTION.

THE CITY WILL NOT PROVIDE FURTHER INFORMATION OR

DETAILS AND BUILDING INSPECTORS WILL NOT PROVIDE
STEP BY STEP INSTRUCTIONS IN THE FIELD.

NO. REVISION DATE
Autodesk Docs://3981-01_Antioch ADU/3981-01_Antioch ADUs - Composite Model.rvt 8/19/2026 12:07:01 PM

ROOF PLAN & REFLECTED

CEILING PLAN - CALIFORNIA
RANCH

PRE-APPROVED ADU

CITY OF ANTIOCH
A3-121
08/19/26

PUBLIC SET

1. 2.

3. 4.

5. 6.

7. 8.

9. 10.

11. 12.

13. REFER TO GENERAL NOTES SHEET G-101 & G-102 FOR ADDITIONAL

REQUIREMENTS

REFER TO STRUCTURAL PLANS FOR ROOF FRAMING INFORMATION
INCLUDING MEMBER SIZES AND CONNECTION HARDWARE.

PROVIDE A MINIMUM OF 1 INCH OF AIRSPACE BETWEEN THE INSULATION AND ROOF SHEATHING.

WHERE THE ROOF PROFILE ALLOWS A SPACE BETWEEN THE ROOF

COVERING AND DECKING, THE SPACES SHALL BE CONSTRUCTED TO

PREVENT THE INTRUSION OF FLAMES AND EMBERS, BE FIRESTOPPED WITH APPROVED MATERIALS OR HAVE ONE LAYER OF MINIMUM 72 POUND

MINERAL-SURFACED NONPERFORATED CAP SHEET OVER THE
COMBUSTIBLE DECKING.

ALL ROOFING MATERIALS TO BE INSTALLED PER MANUFACTURER'S SPECIFICATIONS.

OVERHANG DIMENSIONS ARE FROM FACE OF SHEATHING TO ROOF EDGE.

ROOF COVERINGS SHALL BE APPLIED IN ACCORDANCE WITH (CRC R905), AND MANUFACTURER'S INSTALLATION INSTRUCTIONS. ROOF COVERINGS

SHALL BE INSTALLED TO RESIST THE COMPONENT AND CLADDING LOADS SPECIFIED IN R301.2.1(1), AND ADJUSTED FOR HEIGHT AND EXPOSURE IN ACCORDANCE WITH TABLE R301.2.1(2).

ROOF UNDERLAYMENTS SHALL BE IN ACCORDANCE WITH SECTION R905.1.1, TABLE R905.1.1(2), AND TABLE R905.1.1(1).

ROOF VENTS SHALL BE APPLIED PER MANUFACTURER'S SPECIFICATIONS.

FURNISHED DIMENSIONS FOR VENTS ARE GUIDES ONLY. INSTALL PER

MANUFACTURERS SPECIFICATIONS AND ADJUST TO ACCOMMODATE TRUSS LOCATIONS, PLUMBING VENTS, AND SOLAR COLLECTORS.

ENCLOSED ATTICS AND ENCLOSED RAFTER SPACES FORMED WHERE

CEILINGS ARE APPLIED DIRECTLY TO THE UNDERSIDE OF ROOF RAFTERS

SHALL HAVE CROSS VENTILATION FOR EACH SEPARATE SPACE BY

VENTILATING OPENINGS PROTECTED AGAINST THE ENTRANCE OF RAIN OR SNOW. VENTILATION OPENINGS SHALL HAVE A LEAST DIMENSION OF 1/16 INCH (1.6 MM) MINIMUM AND 1/4 INCH (6.4 MM) MAXIMUM. VENTILATION OPENINGS HAVING A LEAST DIMENSION LARGER THAN 1/4 INCH (6.4 MM)

SHALL BE PROVIDED WITH CORROSION-RESISTANT WIRE CLOTH

SCREENING, HARDWARE CLOTH, PERFORATED VINYL OR SIMILAR MATERIAL WITH OPENINGS HAVING A LEAST DIMENSION OF 1/16 INCH (1.6 MM) MINIMUM AND 1/4 INCH (6.4 MM) MAXIMUM. OPENINGS IN ROOF FRAMING MEMBERS SHALL CONFORM TO THE REQUIREMENTS OF SECTION R802.7. REQUIRED

VENTILATION OPENINGS SHALL OPEN DIRECTLY TO THE OUTSIDE AIR AND

SHALL BE PROTECTED TO PREVENT THE ENTRY OF BIRDS, RODENTS, SNAKES AND OTHER SIMILAR CREATURES (CRC R806).

THE MINIMUM NET FREE VENTILATING AREA SHALL COMPLY WITH CRC R806.2.

IN THE INSTANCE OF UPPER VENTS, VENTS SHALL BE LOCATED NO MORE THAN 3 FT BELOW THE RIDGE OR HIGHEST POINT OF THE SPACE, MEASURED VERTICALLY. CRC R806.2.

ROOF PLAN GENERAL NOTES

1. 2.

3. 4.

5. HEIGHT OF CEILINGS SHALL BE MEASURED FROM TOP OF SLAB OR SUBFLOOR TO FINISH FACE OF GWB, U.N.O.

REFER TO DETAILS FOR FLOOR/CEILING ASSEMBLIES.

REFER TO ELECTRICAL PLANS FOR LIGHT FIXTURE AND EXHAUST LOCATIONS.

DIMENSIONS ARE TO THE FACE OF SHEATHING UNLESS OTHERWISE NOTED.

SOFFITS ARE TO BE HELD TIGHT TO UNDERSIDE OF MECHANICAL EQUIPMENT.

RCP GENERAL NOTES
F02 22" X 30" MINIMUM ATTIC ACCESS. PROVIDED SWITCH AND OUTLET AT ATTIC. THERE IS NO HVAC EQUIPMENT (SUCH AS FURNACE, HEAT PUMP, OR FAU) IN THE ATTIC. PERMANENTLY ATTACH R-38 OR

GREATER INSULATION TO ATTIC ACCESS DOOR USING ADHESIVE OR MECHANICAL FASTENERS CEnC 150.0 (a)1. PROVIDE GASKETED ATTIC ACCESS TO PREVENT AIR LEAKAGE CEnC 150.0 (a)1."
H09 ATTIC VENT (HIGH); UPPER VENTILATORS SHALL BE LOCATED NOT MORE THAN 3 FEET BELOW THE RIDGE OR HIGHEST POINT OF THE SPACE, MEASURED VERTICALLY. PAINT FINISH TO MATCH ROOF
COLOR, SEE VENTING CALCS.

H10 ATTIC VENT (LOW); LOWER VENTILATORS SHALL BE LOCATED IN THE BOTTOM ONE-THIRD OF THE ATTIC SPACE PER R806.2 EXCEPTION 2.

PROVIDE DAMPER TO PROVIDE 1" CLR. AIRSPACE WHERE REQ. PAINT FINISH TO MATCH ROOF COLOR, SEE VENTING CALCS.

K09 COMPOSITE ROOF SHINGLES, ROOF REFLECTANCE (0.1) MIN. ROOF EMITTANCE (0.85) MIN. SEE MATERIALS LEGEND FOR MORE
INFORMATION.

L01 FASCIA; SEE DETAILS FOR MORE INFORMATION.

M01 GUTTER. CONNECT TO DOWNSPOUT. PROVIDE MEANS TO PREVENT

ACCUMULATION OF LEAVES AND DEBRIS IN GUTTER PER CRC
R337.5.4. SEE DETAIL 12/A-903.

M02 DOWNSPOUT TO SPLASH BLOCK BELOW. SEE DETAIL 23/A-901.

KEYNOTES
SCALE: 1/4" = 1'-0"A3-121
REFLECTED CEILING PLAN - CALIFORNIA RANCH3
SCALE: 1/4" = 1'-0"A3-121

REFLECTED CEILING PLAN -
NO COVERED PORCH OPTION4

FOR USE IN CITY OF ANTIOCH ONLY
B35
A
A
1 1
2 2
B
B
3" / 1'-0"
3" / 1'-0"
376 SF 337 SF
TYP.
1' - 0" RAKE
TYP.
1' - 6" EAVE
RIDGE
32 A-911
________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ 31 A-911
________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ 23 A-911
________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ 14 A-911
________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ K09 L01
H10
M01
M02
A
2 3" / 1'-0" 3" / 1'-0"
RIDGE
TYP.
1' - 6" EAVE
TYP.
1' - 0" RAKE

CEILING HEIGHT (SEE PLAN FOR ACTUAL HEIGHTS)
XX'-X"

ROOF PLAN & RCP LEGEND
X" / 12" ROOF SLOPE (REFER TO PLANS FOR ACTUAL SLOPE)

ROOF VENT, SEE ROOF VENTING CALCULATIONS

OUTLINE OF WALL BELOW
GUTTER, CONNECT TO DOWNSPOUT; SEE DETAIL:

APPROXIMATE LOCATION OF DOWNSPOUT/LEADER TO ROOF
OR SPLASHBLOCK BELOW; SEE DETAILS:

MATERIALS LEGEND
INTERIOR CEILING FINISH, TYP. 5/8" GYP.

INSTALL PER MFR RECOMMENDATIONS
NOTE: VISIT GYPSUM.ORG FOR MORE INFORMATION.

1. 2.

3. NOTES:

SOFFIT MATERIALS TO MEET REQ. OF CBC.

INSTALL ALL MATERIALS, FASTENERS, & COMPONENTS PER MANUFACTURER'S

SPECIFICATIONS & RECOMMENDATIONS

INSTALL ADDITIONAL BLOCKING AS NEEDED TO MEET ATTACHMENT REQUIREMENTS PER CBC 701A

A PROJECT SITE WITHIN THE WILDLAND-URBAN INTERFACE FIRE AREA SHALL COMPLY WITH THE CBC 701A. IF WUI APPROVED PRODUCTS ARE REQUIRED, PROVIDE

SELECTED PRODUCT LISTINGS ON THE PRE-APPROVED ADU PROGRAM - OPTION

SELECTION HANDOUT (PAADU)
ROOFING; SEE PRE-APPROVED ADU PROGRAM - OPTION SELECTION HANDOUT (PAADU) FOR SELECTION & MORE INFORMATION. REFER TO TITLE SHEET TO VERIFY WUI REQUIREMENTS ARE APPLICABLE.

A) TONGUE & GROOVE (SOLID SAWN LUMBER)

B) FIBER CEMENT
C) EXT. GRADE FIRE RETARDANT TREATED SHEATHING
(LABEL SELECTION ON REFLECTED CEILING PLAN)
EXTERIOR SOFFITS, RAKES, & EAVES. SEE PRE-APPROVED ADU

PROGRAM - OPTION SELECTION HANDOUT (PAADU)
ASPHALT SHINGLE ROOF; ROOF REFLECTANCE (0.1) MIN. ROOF
EMITTANCE (0.85) MIN. SEE PRE-APPROVED ADU PROGRAM - OPTION

SELECTION HANDOUT (PAADU)
X: SETBACK AT RIDGE TABLE

PV ARRAYS PERCENT OF THE PLAN

VIEW TOTAL ROOF AREA
(X)

HORIZONTAL RIDGE SETBACK
≤33%
>33%
>66% + 12D SPRINKLER
≤66% + 13D SPRINKLER
18" BOTH SIDES OF RIDGE
36" BOTH SIDES OF RIDGE
36" BOTH SIDES OF RIDGE
18" BOTH SIDES OF RIDGE

ROOF VENTING CALCULATIONS

1. 2.

3. WUI REQUIRED? (SEE G-001)

A) NO, MAY USE OPTION A OR C

B) YES, MUST USE FIRE & ICE OPTION B OR OTHER WUI COMPLIANT VENTS UPPER & LOWER VENTS FOR COMPOSITE SHINGLE ROOFING:

A) O'HAGIN TAPERED LOW PROFILE COMPOSITION SHINGLE.

C) ALTERNATIVE PRODUCT, MUST BE EQUAL TO PRODUCT ABOVE, AND PROVIDE GREATER THAN OR EQUAL AIR MOVEMENT.

ROOF VENTING SHALL COMPLY WITH CRC R806 & CBC 701A.

ENCLOSED ATTICS AND ENCLOSED RAFTER SPACES FORMED WHERE CEILINGS

ARE APPLIED DIRECTLY TO THE UNDERSIDE OF ROOF RAFTERS SHALL HAVE

OPEN DIRECTLY TO THE OUTSIDE AIR AND SHALL BE PROTECTED TO PREVENT THE ENTRY OF BIRDS, RODENTS, SNAKES AND OTHER SIMILAR CREATURES.

THE MINIMUM NET FREE VENTILATING AREA SHALL COMPLY WITH CRC R806.2. *OWNER/APPLICANT REQ. TO SELECT ONE THE FOLLOWINGA
A
1 1
2 2
B
B

HALLWAY
CL.

BED 2
BATH

KITCHEN/DINING

LAUNDRY
LIVING
CL.

BED 1
CL
WH
8' - 0"
3" / 1'-0"
OPT. COVERED

PORCH - MCM
3" / 1'-0"
A
2 KITCHEN/DININGLAUNDRY LIVINGWH
8' - 0"

VENT TYPE COUNT VENT LENGTH

NET FREE

AREA PER
VENT

PROVIDED

NET FREE
AREA
LOWER

O'HAGIN SHINGLE ROOF VENT
(LOWER)
3 2' - 8" 0.50 SF 1.50 SF
UPPER

O'HAGIN SHINGLE ROOF VENT
(UPPER)
3 2' - 8" 0.50 SF 1.50 SF

3.00 SF

ATTIC AREA

REQUIRED ATTIC

VENTING (NFA)

UPPER VENTING

REQUIRED (NFA)

LOWER VENTING

REQUIRED (NFA)
ATTIC 1 645 SF 2.15 SF 1.07 SF 1.07 SF
SCALE: 1/4" = 1'-0"A3-122
ROOF PLAN - MID-CENTURY MODERN1
VENTING NEEDED (BASED ON OPTION A):

VENTING PROVIDED (BASED ON OPTION A):

SCALE: 1/4" = 1'-0"A3-122

ROOF PLAN - NO COVERED
PORCH OPTION2
DATE
SHEET

THESE PLANS ARE PROVIDED BY THE CITY OF ANTIOCH AS

PART OF THE PRE-APPROVED ADU PROGRAM AND ARE
PUBLIC DOMAIN. THERE CANNOT BE A CHARGE TO
PROVIDE THESE PLANS. NO ALTERATIONS TO THESE PLANS
ARE ALLOWED. ALL ALTERATIONS MUST BE DONE UNDER A

SEPARATE PERMIT ONCE THE BUILDING PERMIT FOR THE

ADU HAS BEEN ISSUED AND FINAL INSPECTION
COMPLETED. IF YOU DO NOT HAVE THE CONSTRUCTION

KNOWLEDGE AND EXPERIENCE TO CONSTRUCT THESE

PLANS WITHOUT FURTHER DETAILS, IT IS RECOMMENDED
YOU HIRE A CONTRACTOR TO DO THE CONSTRUCTION.

THE CITY WILL NOT PROVIDE FURTHER INFORMATION OR

DETAILS AND BUILDING INSPECTORS WILL NOT PROVIDE
STEP BY STEP INSTRUCTIONS IN THE FIELD.

NO. REVISION DATE
Autodesk Docs://3981-01_Antioch ADU/3981-01_Antioch ADUs - Composite Model.rvt 8/19/2026 12:07:02 PM

ROOF PLAN & REFLECTED

CEILING PLAN - MID-CENTURY
MODERN

PRE-APPROVED ADU

CITY OF ANTIOCH
A3-122
08/19/26