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WDi Project Number 240318 26-Nov-24 Public Works Service Center Re -roofing <br />Flashings <br />1. Construct in accordance with roofing system manufacturer's standard details. <br />2. Juncture of Horizontal and Vertical Surfaces: <br />a. Use longest practical length flashing to minimize joints. <br />b. Complete splice between flashing and main roof sheet before bonding flashing to vertical surface. <br />Extend splice3 inches beyond fasteners that attach membrane to horizontal surface. <br />c. Adhere flashing to substrate with full bed of adhesive. <br />d. Fasten top of flashing at 12inches on center maximum, under metal flashing. <br />3. Penetrations through Membrane: <br />a. Flash pipe with premolded pipe flashings wherever possible. <br />b. Where molded pipe flashings cannot be installed, use field fabricated pipe seals. <br />C. Seal clusters of pipes and unusually shaped penetrations with minimum 4 inch high flashing containing <br />pourable sealer. <br />4. Expansion Joints: <br />a. Complete roof membrane and flashing installation prior to installing expansion joint. <br />b. Set joint cover on top of wood nailers; secure on each side through metal flange. <br />C. Seal joint cover flanges to membrane as for sheet splice. <br />G. Roof Drains: <br />1. Taper insulation around drain to provide smooth transition from roof surface to drain clamping ring <br />2. Seal between membrane and drain base with water cutoff mastic. <br />H. Walkways: <br />1. Install walkways at traffic concentration points (such as roof hatches, access doors, rooftop ladders, etc.) and <br />locations as identified on Contract Documents. <br />3.3 FIELD QUALITY CONTROL <br />A. Arrange for roofing system manufacturer's technical personnel to inspect roofing installation upon completion. <br />B. Repair or remove and replace components of roofing system that do not comply with specified requirements. <br />C. Correct deficiencies in or remove roofing system that does not comply with requirements, repair substrates, and <br />repair or reinstall roofing system to a condition free of damage and deterioration at time of Substantial Completion <br />and according to warranty requirements. <br />D. Additional testing and inspecting, at Contractor's expense, will be performed to determine if replaced or additional <br />work complies with specified requirements. <br />3.4 PROTECTION <br />A. Protect new roofing system from damage and wear during construction period. Inspect new roofing for damage if <br />used during construction <br />END OF SECTION <br />Polyvinyl Chloride Roofing 7 of 7 Section 07 5419 <br />