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ROOFING REPLACEMENT, RECOVER AND REPAIR PROJECT PAGE 8 <br />INDIAN RIVER COUNTY - JAIL COMPLEX SECTION 076200 <br />JANUARY 4, 2018 SHEET METAL FLASHING AND TRIM <br />2. Underlayment: Where installing metal flashing directly on cementitious or wood <br />substrates, install a course of Grace "Ultra" underlayment. <br />3. Bed flanges in thick coat of asphalt roofing cement where required for waterproof <br />performance. <br />C. Install exposed sheet metal flashing and trim without excessive oil canning, buckling, <br />and tool marks. <br />D. Install sheet metal flashing and trim true to line and levels indicated. Provide uniform, <br />neat seams with minimum exposure of solder, welds, and butyl sealant. <br />E. Install sheet metal flashing and trim to fit substrates and to result in watertight <br />performance. Verify shapes and dimensions of surfaces to be covered before <br />fabricating sheet metal. <br />F. Expansion Provisions: Provide for thermal expansion of exposed flashing and trim. <br />Space movement joints at a maximum of 10 feet (3 m) with no joints allowed within 24 <br />inches (600 mm) of corner or intersection. Where lapped or bayonet-type expansion <br />provisions cannot be used or would not be sufficiently watertight, form expansion joints <br />of intermeshing hooked flanges, not less than 1 inch (25 mm) deep, filled with butyl <br />sealant concealed within joints. <br />G. Fasteners: Use fasteners of sizes that will penetrate substrate not less than 1-1/4 <br />inches (32 mm) for nails and not less than 3/4 inch (19 mm) for wood screws. <br />1. Stainless Steel: Use stainless-steel fasteners. <br />H. Seal joints with butyl sealant as required for watertight construction. <br />1. Where sealant -filled joints are used, .embed hooked flanges of joint members not <br />less than 1 inch (25 mm) into sealant. Form joints to completely conceal sealant. <br />When ambient temperature at time of installation is moderate, between 40 and <br />70 deg F (4 and 21 deg C), set joint members for 50 percent movement either <br />way. Adjust setting proportionately for installation at higher ambient <br />temperatures. Do not install sealant -type joints at temperatures below 40 deg F <br />(4 deg C). <br />2. Prepare joints and apply sealants to comply with requirements in Division 7 <br />Section "Joint Sealants." <br />3.3 ROOF FLASHING INSTALLATION <br />A. General: Install sheet metal roof flashing and trim to comply with performance <br />requirements and SMACNA's "Architectural Sheet Metal Manual." Provide concealed <br />fasteners where possible, set units true to line, and level as indicated. Install work with <br />laps, joints, and seams that will be permanently watertight. <br />B. Roof Edge Flashing: Anchor to resist uplift and outward forces according to <br />recommendations in FMG Loss Prevention Data Sheet 1-49 for specified wind zone <br />and as indicated. <br />