Project Information

Bid Title

BID#1973?MDUSD 2026?Roofing Project - Holbrook Language Academy and Valle Verde Elementary School Addendum 1

Issuing Agency

Mt. Diablo Unified School District

Location

California

Published Date

Mar 11, 2026

Closing Date

Mar 17, 2026

Government Level

State & Local

Status

Closed

Original Source

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Bid Documents

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Project Description

BID#1973 MDUSD 2026 Roofing Project - Holbrook Language Academy and Valle Verde Elementary SchoolOPEN FOR BIDDING.  Bids Due March 17, 2026 at 10:00 a.m.

• 1973 BID Addendum 1
• 1973 BID Mandatory Walk SignIn Sheet
• 1973 BID Volume 1
• 1973 BID Volume 2
• 1973 BID Drawings-Holbrook
• 1973 BID Drawings-Valle Verde ES

Attachment Preview

PURCHASING & WAREHOUSE DEPARTMENT

2326 Bisso Lane, Concord, California 94520

BID #1973

2026 Roofing Project -

Holbrook and Valle Verde

Elementary Schools

FOR

MT. DIABLO UNIFIED SCHOOL DISTRICT

ADDENDUM #1

​

DOCUMENT 00 91 13

ADDENDA

03/10/2026

NOTICE TO ALL BIDDERS: THE FOLLOWING MODIFICATIONS, ADDITIONS, DELETIONS, CLARIFICATIONS

AND/OR INFORMATION ARE HEREBY MADE PART OF THE CONTRACT DOCUMENTS. ADDENDUM MUST

BE ACKNOWLEGDED AS PART OF THE BIF FORM.

(1) CHANGES TO TECHNFICAL SPECIFICATIONS (attached)

(a) 07.55.00 – Modified Bituminous Roofing – Removed and replaced

(2) BID QUESTIONS (RFI’s)

(a) What is the engineer’s estimate for this project?

(i) $4,400,000.00

(b) What is the warranty/Maintenance period?

(i) 5-year craftsmanship warranty as outlined in Article 1 of the technical spec section,

07.55.00-Modified Bituminous Roofing.

(c) Do we need to prequalify through Quality Bidders if we are submitting a bid as a C-39

roofing Contractor?

(i) Per Instruction to Bidders; all prime bidders are required to prequalify prior to submitting

a bid to MDUSD.

Mt. Diablo Unified School District

ADDENDUM #1

Addenda

DOCUMENT 00 91 13 1

2026 Roof Package #2 – Valle Verde ES and Holbrook Language Academy

Mt. Diablo Unified School District

SECTION 07550

MODIFIED BITUMINOUS MEMBRANE ROOFING

PART 1 GENERAL

1.1 SECTION INCLUDES

A. Includes all labor, non-owner supplied materials, and equipment to install a modified bitumen

roof system over the properly prepared substrate.

B. Includes removal and disposal of existing roofing system(s), insulation board, gutters,

downspouts (schedule 40 to remain), flashings, counter flashings, sheet metal items,

copings, expansion joints, etc. for a complete prepared roof surface to receive the new

roofing system.

C. Includes a new hot applied 2-ply asphalt roofing system with all accessories as needed for a

complete warrantable roofing system.

D. Includes testing of all drains and downspouts before construction and after construction to

ensure proper drain performance.

1.2 RELATED SECTIONS

A. Section 01640 – Owner Furnished Material

B. Section 07220 – Roof Deck Insulation

C. Section 07620 - Sheet Metal Flashing and Trim

1.3 REFERENCES

A. ASTM D 41 - Standard Specification for Asphalt Primer Used in Roofing, Dampproofing, and

Waterproofing.

B. ASTM D 312 - Standard Specification for Asphalt used in Roofing.

C. ASTM D 451 - Standard Test Method for Sieve Analysis of Granular Mineral Surfacing for

Asphalt Roofing Products.

D. ASTM D 1079 Standard Terminology Relating to Roofing, Waterproofing and Bituminous

Materials.

E. ASTM D 1863 Standard Specification for Mineral Aggregate Used as a Protective Coating

for Roofing.

F. ASTM D 2178 Standard Specification for Asphalt Glass Felt Used in Roofing and

Waterproofing.

G. ASTM D 2822 Standard Specification for Asphalt Roof Cement.

H. ASTM D 4601 Standard Specification for Asphalt Coated Glass Fiber Base Sheet Used in

Roofing.

I. ASTM D 5147 Standard Test Method for Sampling and Testing Modified Bituminous Sheet

Materials.

J. ASTM D 6162 Standard Specification for Styrene Butadiene Styrene (SBS) Modified

07550-1 ADDENDUM #1

2026 Roof Package #2 – Valle Verde ES and Holbrook Language Academy

Mt. Diablo Unified School District

Bituminous Sheet Materials Using a Combination of Polyester and Glass Fiber

Reinforcements.

K. ASTM E 108 - Standard Test Methods for Fire Test of Roof Coverings

L. Factory Mutual Research (FM): Roof Assembly Classifications.

M. National Roofing Contractors Association (NRCA): Roofing and Waterproofing Manual.

N. Sheet Metal and Air Conditioning Contractors National Association, Inc. (SMACNA) -

Architectural Sheet Metal Manual.

O. Underwriters Laboratories, Inc. (UL): Fire Hazard Classifications.

P. Warnock Hersey (WH): Fire Hazard Classifications.

Q. ANSI-SPRI ES-1 Wind Design Standard for Edge Systems used with Low Slope Roofing

Systems.

R. ASCE 7, Minimum Design Loads for Buildings and Other Structures

S. UL - Fire Resistance Directory.

T. FM Approvals - Roof Coverings and/or RoofNav assembly database.

U. California Title 24 Energy Efficient Standards.

1.4 DESIGN / PERFORMANCE REQUIREMENTS

A. Perform work in accordance with all federal, state and local codes.

B. Exterior Fire Test Exposure: Roof system shall achieve a UL, FM or WH Class rating for roof

slopes indicated on the Drawings as follows:

1. Factory Mutual Class A Rating.

2. Underwriters Laboratory Class A Rating.

3. Warnock Hersey Class A Rating.

C. Design Requirements:

1. Uniform Wind Uplift Load Capacity

a. Installed roof system shall withstand negative (uplift) design wind loading

pressures complying with the following criteria.

1) Design Code: ASCE 7, Method 2 for Components and Cladding.

2) Importance Category:

a) III.

3) Importance Factor of:

a) 1.0

4) Wind Speed: 115 mph

5) Ultimate Pullout Value: 364 pounds per each of the fastener

6) Exposure Category:

a) B.

7) Roof Pitch: 0.5 :12.

8) Roof Area Design Uplift Pressure:

a) Zone 1 - Field of roof 14.3 psf

b) Zone 2 - Eaves, ridges, hips and rakes 24 psf

c) Zone 3 - Corners 36 psf

2. Live Load: 20 psf, or not to exceed original building design.

3. Dead Load:

a. Installation of new roofing materials shall not exceed the dead load capacity of

07550-2 ADDENDUM #1

2026 Roof Package #2 – Valle Verde ES and Holbrook Language Academy

Mt. Diablo Unified School District

the existing roof structure.

D. Energy Star: Roof System shall comply with the initial and aged reflectivity required by the

U.S. Federal Government's Energy Star program.

E. LEED: Roof system shall meet the reflectivity and emissivity criteria to qualify for one point

under the LEED credit category, Credit 7.2, Landscape & Exterior Design to Reduce Heat

Island - Roof.

F. Roof System membranes containing recycled or bio-based materials shall be third party

certified through UL Environment.

G. Roof system shall have been tested in compliance with the following codes and test

requirements:

1. Cool Roof Rating Council:

a. CRRC Directory CRRC 077-0028

2. International Code Council Evaluation Service (ICC-ES):

a. Membrane Systems

1) ESR

3. Underwriters Laboratories:

a. Certification TGFU.R

4. Warnock Hersey

a. ITS Directory of Listed Products

5. FM Approvals:

a. RoofNav Website

1.5 SUBMITTALS

A. Submit under provisions of Section 01300.

B. Product Data: Manufacturer's data sheets on each product to be used, including:

1. Preparation instructions and recommendations.

2. Storage and handling requirements and recommendations.

3. Installation instructions.

C. Shop Drawings: Submit shop drawings including installation details of roofing, flashing,

fastening, insulation and vapor barrier, including notation of roof slopes and fastening

patterns of insulation and base modified bitumen membrane, prior to job start.

D. Design Pressure Calculations: Submit design pressure calculations for the roof area in

accordance with ASCE 7 and local Building Code requirements. Include a roof system

attachment analysis report, certifying the system's compliance with applicable wind load

requirements before Work begins. Report shall be signed and sealed by a Professional

Engineer registered in the State of the Project who has provided roof system attachment

analysis for not less than 5 consecutive years.

E. LEED Submittals: Provide documentation of how the requirements of Credit will be met:

1. List of proposed materials with recycled content. Indicate post-consumer recycled

content and pre-consumer recycled content for each product having recycled content.

2. Product data and certification letter indicating percentages by weight of post-

consumer and pre-consumer recycled content for products having recycled content.

3. Product reflectivity and emissivity criteria to qualify for one point under the LEED

credit category, Credit 7.2, Landscape & Exterior Design to Reduce Heat Island -

Roof.

F. Recycled or Bio-Based Materials: Provide third party certification through UL Environment of

roof System membranes containing recycled or bio based materials

07550-3 ADDENDUM #1

Commodity Codes

• NAICS 236220Commercial and Institutional Building Construction
• NAICS 238160Roofing Contractors

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