City of Cotati Public Works
Well 2 Roof
Assessment and Recommendations
Accessed from 8562 Lakewood Ave , Cotati, CA 94931
Well 2 – North Elevation
IR Project No. 2025-007-01
Report Date:
July 16, 2025
Prepared for:
Craig A. Scott
Public Works Director/City Engineer
City of Cotati
Prepared by:
Edward J. Anisman, AIA
Interactive Resources Inc.
117 Park Place
Richmond, California
94801
Well 2 Roof – Assessment and Recommendations
Accessed from 8562 Lakewood Ave, Cotati, CA 94931
P a g e | 2
117 Park Place
Richmond, California 94801
510.236.7435 | www.intres.com
City of Cotati – Well 2 Roof Assessment and Recommendations Interactive Resources Project No. 2025-007-01
Observations by: E. Anisman
and C. Young
Date: 07/10/2025
General Overview
Roof Condition Summary:
Existing condition and possible
life expectancy based on visual
observations and limited test
cuts. Summary at right in noted
in bold font.
In Failure 0 to 2 years – N/A
Poor 2 to 4 years – Low Slope (BUR) Built Up Roof
Fair 4 to 7 years – N/A
Good 7 to 10 years – N/A
More than 10-years 10+ years– N/A
1. Scope of Work Limitations: This assessment is limited to the low slope and steep roof systems at the Well 2 pump structure.
2. General Observations
Observations: Observations were made on July 10, 2025. The existing roof consists of an upper low-slope roof of unconfirmed construction (with an access hatch for the pump) adjoined at both sides by lower, steep asphalt composition shingle roofs. The portion of the steep roof immediately adjoining the low-slope upper roof is nearly vertical. A gutter and downspout are provided at the north elevation, over the entry door. Observed deficiencies include – but are not limited to the following:
• Condition of the roof appears beyond the expected service life with overall wear indicated and uneven areas in the field of the roof.
• Metal flashings are corroded.
• Wood fascia trim is badly weathered and possibly decayed Overall Condition: Poor
3. Water Penetration History
and Observations
General: Currently, there are no reported occurrences of water penetration.
4. Approximate Area
• Low Slope Roof: ±150sf
• Steep Roofs: ±600sf
5. Roofing Membrane
• Low Slope Roof: Single-ply assumed but not verified
• Steep Roofs: Asphalt composition shingles
6. Insulation Not Applicable
7. Drainage/Slope Approximately 4:12 typical to 2:1 adjoining low-slope roof.
8. Drains and Overflows:
• Low Slope Roof: Scupper assumed but not verified
• Steep Roofs: Gutter and downspout at north elevation only
9. Structural Deck Type Plywood sheathing over conventional 2x framing assumed
10. Penetrations None
11. MEP systems Not Applicable
12. HazMat Report A HazMat report is not in the Scope of Work for this assessment.
Well 2 Roof – Assessment and Recommendations
Accessed from 8562 Lakewood Ave, Cotati, CA 94931
P a g e | 3
117 Park Place
Richmond, California 94801
510.236.7435 | www.intres.com
City of Cotati – Well 2 Roof Assessment and Recommendations Interactive Resources Project No. 2025-007-01
Executive Summary
Observations: Observations were made on July 10, 2025. The existing roof consists of an upper low-slope roof of unconfirmed construction (with an access hatch for the pump) adjoined at both sides by lower, steep asphalt composition shingle roofs. The portion of the steep roof immediately adjoining the low-slope upper roof is nearly vertical. A gutter and downspout are provided at the north elevation, over the entry door. Observed deficiencies include – but are not limited to the following:
• Condition of the roof appears beyond the expected service life with overall wear indicated and uneven areas in the field of the roof.
• Metal flashings are corroded.
• Wood fascia trim is badly weathered and possibly decayed Recommendations
Based upon our observations, full roof replacement is recommended, as follows:
• Demolition: Remove the existing roof systems as required to expose the plywood substrate; remove the existing gutter and downspout.
• New Work: Provide a new 60 mil PVC membrane at upper roof and Class A composition shingle roof to replace existing shingles, both over existing plywood deck. Replace decayed wood trim. Replace all metal perimeter flashings, gutter and downspout with prefinished metal. Provide a minimum 30 year warranty.
Paint repair wood trim.
Bid Documents: Unless otherwise directed by the City, we will prepare a base specification section for a new asphalt composition shingle roof as described above, suitable for bidding purposes.
Cost Estimate: Not included in Scope of Work.
Well 2 Roof – Assessment and Recommendations
Accessed from 8562 Lakewood Ave, Cotati, CA 94931
P a g e | 4
117 Park Place
Richmond, California 94801
510.236.7435 | www.intres.com
City of Cotati – Well 2 Roof Assessment and Recommendations Interactive Resources Project No. 2025-007-01
Limitations and Preparation
Limitations
The services of Interactive Resources are provided in a manner we believe to be consistent with the prevailing standard of care. This report is neither comprehensive nor exhaustive and is based on limited observations of the project, limited exploratory demolition, review of documents cited and discussions with individuals listed. The information is for the exclusive use of the client to whom this is addressed.
Interactive Resources does not warrant or guarantee the performance of any in-place or future construction on this project, whether or not it incorporates any of the recommendations contained herein.
Preparation
This report was prepared by:
Edward J. Anisman, AIA
Exhibits
Exhibit A – Photographs
Well 2 Roof – Assessment and Recommendations
Accessed from 8562 Lakewood Ave, Cotati, CA 94931
P a g e | 5
117 Park Place
Richmond, California 94801
510.236.7435 | www.intres.com
City of Cotati – Well 2 Roof Assessment and Recommendations Interactive Resources Project No. 2025-007-01
Exhibit A – Photographs
Photo Description
1. South and East Elevations
2. Steep roof detail showing pump access hatch at
low slope roof, corroded sheet metal flashings,
steep roof transition with uneven field of roof and
aged asphalt composition shingles.
Well 2 Roof – Assessment and Recommendations
Accessed from 8562 Lakewood Ave, Cotati, CA 94931
P a g e | 6
117 Park Place
Richmond, California 94801
510.236.7435 | www.intres.com
City of Cotati – Well 2 Roof Assessment and Recommendations Interactive Resources Project No. 2025-007-01
3. Roof eave and rake details.