SUT FY22 DAM Roof Replacement

Contractor shall furnish all equipment and labor to necessary to properly remove/dispose of current Ethylene Propylene Diene Monomer (EPDM) roof and underlayment. Contractor shall prepare concrete roof surface for replacement and install new EPDM roofing system with proper grade and drainage to existing center drain on roof, approximately 1,400 square feet. Asbestos removal was conducted during previous roof installation. Access to roof is via ladder and hatch in center of roof. U.S. Army Corps will supply crane for lifting/lowering supplies to top of roof from dam roadway surface. Photos of roof provided in Exhibit A. 2. Scope of Work and Information: A. Contractor shall remove current EPDM rubber material as well as underlayment materials to the bare concrete. Contractor shall dispose of materials properly and prepare site for installation. B. Contractor shall install EPDM rubber roofing that meets ASTMD4637/D463M-10 Standard Specifications for single ply roof membrane. All materials shall be of high quality and free from defect at time of install and come with a 20 year manufacturers warranty. C. Contractor shall install 90 mil EPDM type roof membrane according to manufacturer's recommendations. i. Concrete/drain shall be inspected and repaired if necessary prior to installation. ii. Concrete must be completely dry at time of installation. iii. Care shall be taken to ensure HVAC components on roof are not damaged during installation and are properly functioning when finished. D. Contractor shall install new tapered, rigid insulation underlayment with a minimum of 1/2 inch thickness to provide proper base for new roof and correct drainage, following all manufacturer's specifications. i. Base insulation shall be secured to concrete surface by hot asphalt mopping method or similar compatible, manufacturer's recommended method with roofing system. ii. Contractor shall ensure underlayment system is compatible with EPDM membrane and adhesive method used. iii. Contractor shall secure roof membrane to underlayment insulation system with proper adhesive or add additional substrate layer to ensure roof material will be secured properly with nothing touching the roof membrane that will cause leaks. iv. Contractor shall install roof membrane that is properly attached with minimal wrinkles and proper drainage with no areas where water will stand or pool. v. Contractor shall ensure roof membrane is one solid piece and no seams are used. E. Contractor shall install termination bars on parapet walls, chimney and roof hatch.

Division 07 -

Thermal and Moisture Protection, Dampproofing and Waterproofing, Thermal Protection.