Attachment A - Scope of Work.docx

A. General

1. Work under this section includes removing existing asphalt shingle roof, underlayment/roofing felt, gutters and downspouts and installing new rake and drip edge, continuous ridge vent, seamless gutters, underlayment/roofing felt, ice and water shield and roof shingles on the Crane Meadows NWR Headquarters as specified.

2. All work described herein shall be accomplished by mechanics and workmen experienced in this type of work.

3. Quality Assurance:

UL Listing: Provide labeled materials which have been tested and listed by UL for Class and Rating indicated for each shingle type required.

Asphalt Roofing Manufacturers Association: All roofing materials shall be installed in strict accordance with the Residential Asphalt Roofing Manual published by the Asphalt Roofing Manufacturers Association.

4. Submittals:

a. Product Data: Submit technical product data, installation instructions and recommendations from shingle manufacturer, including data that materials comply with requirements.

b. Samples: Submit full range of samples for color and texture for government selection and approval.

c. Maintenance stock 2 bundles of shingles used in the work

5. Delivery, Storage and Handling:

[Type here]

b. Store materials to avoid water damage, and store rolled goods on end. Comply with manufacturer's recommendations for job-site storage and protection.

6. Job Conditions:

a. Substrate: Proceed with shingle work only if substrate is in good condition. Patch any small holes, if substrate is in a deteriorated condition notify government.

b. Weather Conditions: Proceed with shingle work only when weather conditions follow manufacturer's recommendations and when substrate is completely dry.

7. Specified Product Warranty:

a. Provide shingle manufacturer's warranty on installed work, agreeing to pay for repair or replacement of defective shingles as necessary to eliminate leaks. Period of warranty is lifetime from date of substantial completion.

b. If an Owens Corning System is used (system means that a minimum of three Owens Corning products are used (shingles, underlayment and ice and water shield) then the installation qualifies for the “System Protection Warranty”. Provide the System protection Warranty at completion of the work. I another manufacture follow their procedure and supply a similar or greater warranty at completion of the work.

B. Materials

Asphalt Shingle Materials:

1. Tab Architectural Strip Shingles, UL Class "A", Heavyweight: Mineral-surfaced, self-sealing, asphalt fiberglass strip shingles complying with ASTM D 3018, Type 1 self-sealing (architectural shingle)and ASTM D 3462. Provide shingles bearing UL Class "A" external fire exposure label and UL "Wind Resistant" label. Submit color samples and manufacturer's certification to the Government.

Products: Subject to compliance with requirements, provide the following or approved equal. Manufacturer and style are supplied only to establish a standard for appearance and texture:

Shingles: Owens Corning Duration “Flex or Storm”, Lifetime Warranty, full range of color for government to select from. Provide a System Protection Warranty

3. Ice Dam Barrier: Owens Corning Weather Lock® Mat Self-Sealing Ice & Water Barrier. Membrane shall be reinforced and shall seal nail penetrations.

4. Mineral-Surfaced Roll Roofing: Starter strip shall be 50-pound smooth roll roofing or Mineral-surfaced No. 90 asphalt roll roofing, complying with ASTM D 249 and surfaced on weather side with mineral granules to match roofing shingles, with 2" salvage edge, and bearing UL Class "C" label.

5. Asphalt Plastic Cement: Fibrated asphalt cement complying with ASTM D 2822, designed for trowel application.

6. Hip and Ridge Shingles: Manufacturer's standard factory pre-cut units to match shingles of job-fabricated units cut from actual shingles used.

8. Metal Drip Edge: Minimum .024" prefinished aluminum 24" clad steel sheet, brake-formed to provide 3"or 4" roof deck flange, and 1-1/2" fascia flange with 3/8" drip at lower edge. Furnish in 8' or 10' lengths. Submit sample for color selection (brown in color).

9. Metal Flashing: .024" prefinished sheet aluminum or clad steel. Job-cut to sizes and configurations required (brown in color).

10. Roof Jacks: All vertical vent pipes shall be covered with new roof jacks (brown or black in color).

11. Roof Ridge Vents: Withstands wind driven rain tests, minimum 75 mph. Continuous ridge vent shall be Copolymer vent with internal baffle, crush resistant and low profile. 12 sq inches of net free ventilation. Vent shall be covered with shingles to match roof, minimum 30 year warranty on vent.

12. Gutter: 6" pre finished brown or white seamless extra heavy gauge minimum .032" aluminum "k" style gutters and brown aluminum .019 gage 6 inch downspout. (submit full range of browns and white available for gutter and downspout)

C. Execution

1. Inspection:

Examine substrate and conditions under which shingling work is to be performed must notify Government in writing if unsatisfactory conditions are present. Do not proceed with shingling work until unsatisfactory conditions have been corrected.

2. Preparation of Substrate:

a. Demolition: Remove existing shingles, underlayment/felt paper, gutters and downspouts. All nails shall be removed from the wood sheathing. All roofing debris shall be removed from the job site. Debris shall be picked up from the ground on a daily basis including all nails.

b. Clean substrate of any projections and substances detrimental to shingling work. Cover knotholes of other minor voids in substrate with sheet metal flashing secured with roofing nails.

c. Coordinate installation of shingles with flashing and other adjoining work to ensure proper sequencing. Do not install shingle roofing until all vent stacks and other penetrations through roofing are securely fastened against movement.

d. Repair substrate: Replace damaged wood sheathing substrate that is decayed or rotten. New substrate shall be supported by roof rafters. Damaged roof sheathing shall be cut out and replaced with plywood sheathing.

3. Installation:

a. General: Comply with instructions and recommendations of shingle manufacturer, except to extent more stringent requirements are indicated.

b. Patching: Patching of roof sheathing if necessary, shall be done by Contractor.

c. Underlayment: Apply one layer underlayment horizontally over entire surface, lapping succeeding courses as required by manufacturer. The underlayment shall be smooth prior and subsequent to fastening with sufficient nails to hold in place until shingle application.

d. Flashing and Edge Protection: Install metal flashing, vent flashing and edge protection as indicated and in compliance with recommendations of the NRCA Steep Roofing Manual. Drip edge shall be installed on all rakes and eaves.

e. Ice Protection Underlayment: In addition to felt underlayment, install continuous strip of ice protection underlayment of rubber ice dam material along eaves and rakes to a minimum distance of 24 inches inside the interior wall line.

f. Starter Course: In addition to Ice protection install starter of roll roofing. Install roll roofing along eaves to a point 12" minimum beyond wall line. Set in continuous bed of asphalt plastic cement and secure with roofing nails at 6" centers along all edges. Provide 2" laps where required, set in roofing cement. If head laps are required, install so head lap occurs 12" before wall line. Use horizontal and vertical chalk lines to ensure straight coursing.

g. Install continuous ridge vents, color to match roof. Install according to manufacturer's recommendations. If opening is not large enough or does not exist cut and remove plywood along ridge.

h. Shingles: Install shingles in pattern, weather exposure and number of fasteners per shingle as recommended by manufacturer. Use horizontal and vertical chalk lines to ensure straight coursing. Use min. 4 nails per shingle. Comply with installation details and recommendations of shingle manufacturer and NRCA Steep Roofing Manual.

i. Clean Site: Remove all debris including shingles, nails, paper, etc. from the area around the job site and place in a dumpster or remove from site daily. All nails shall be removed from the site.

j. Gutters: Install gutters and downspout on both sides of building. Field measure building. Downspout locations must be approved by refuge manager. Install gutters in accordance with the Aluminum siding application manual RA-15. Supply a minimum 5 foot downspout extension and concrete splash block at each downspout to carry water away from building.

4. Extra Stock:

Provide minimum of 1 bundle of installed each type/color/texture shingle used in the work. Provide in unopened clearly labelled bundle.

(END OF SECTION 07311)