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ROOFING REPLACEMENT PROJECT PAGE 7 <br />NORTH COUNTY REGIONAL PARK AQUATIC CENTER SECTION 076200 <br />JUNE 7, 2019 SHEET METAL AND FLASHINGS <br />1. Install self -adhering, high-temperature sheet underlayment; wrinkle free. <br />2. Prime substrate if recommended by underlayment manufacturer. <br />3. Comply with temperature restrictions of underlayment manufacturer for <br />installation; use primer for installing underlayment at low temperatures. <br />4. Apply in shingle fashion to shed water, with end laps of not less than 6 inches <br />(150 mm) staggered 24 inches (600 mm) between courses. <br />5. Overlap side edges not less than 3-1/2 inches (90 mm). Roll laps and edges with <br />roller. <br />6. Roll laps and edges with roller. <br />7. Cover underlayment within 14 days. <br />3.2 INSTALLATION, GENERAL <br />A. Install sheet metal flashing and trim to comply with details indicated and <br />recommendations of cited sheet metal standard that apply to installation characteristics <br />required unless otherwise indicated on Drawings. <br />1. Install fasteners, solder, protective coatings, separators, sealants, and other <br />miscellaneous items as required to complete sheet metal flashing and trim <br />system. <br />2. Install sheet metal flashing and trim true to line, levels, and slopes. Provide <br />uniform, neat seams with minimum exposure of solder and sealant. <br />3. Anchor sheet metal flashing and trim and other components of the Work securely <br />in place, with provisions for thermal and structural movement. <br />4. Install sheet metal flashing and trim to fit substrates and to result in watertight <br />performance. <br />5. Install continuous cleats with fasteners spaced not more than 12 inches (300 <br />mm) O.C. <br />6. Install exposed sheet metal flashing and trim with limited oil -canning, and free of <br />buckling and tool marks. <br />7. Do not field cut sheet metal flashing and trim by torch. <br />B. Metal Protection: Where dissimilar metals contact each other, or where metal contacts <br />pressure -treated wood or other corrosive substrates, protect against galvanic action or <br />corrosion by painting contact surfaces with bituminous coating or by other permanent <br />separation as recommended by sheet metal manufacturer or cited sheet metal <br />standard. <br />1. Coat concealed side of stainless steel sheet metal flashing and trim with <br />bituminous coating where flashing and trim contact wood, ferrous metal, or <br />cementitious construction. <br />2. Underlayment: Where installing sheet metal flashing and trim directly on <br />cementitious or wood substrates, install underlayment and cover with slip sheet. <br />C. Expansion Provisions: Provide for thermal expansion of exposed flashing and trim. <br />1. Space movement joints at maximum of 10 feet (3 m) with no joints within 24 <br />inches (600 mm) of corner or intersection. <br />2. Use lapped expansion joints only where indicated on Drawings. <br />