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2 . 5 FABRICATION <br /> A. General: Fabricate roll-formed sheet metal roofing panels with UL-certified, portable roll-forming <br /> equipment capable of producing roofing panels for sheet metal roofing assemblies that comply with <br /> UL 580 for wind-uplift resistance classification specified in " Quality Assurance " Article . Fabricate roll- <br /> formed sheet metal according to equipment manufacturer's written instructions and to comply with details <br /> shown. <br /> B . Fabrication Tolerances : Fabricate sheet metal roofing that is capable of installation to a tolerance of 1 /4 <br /> inch in 20 feet (6 mm in 6 m) on slope and location lines as indicated and within 1 /8-inch (3 -mm) offset <br /> of adjoining faces and of alignment of matching profiles . <br /> C. Form exposed sheet metal work to fit substrates without excessive oil canning, buckling, and tool marks; <br /> true to line and levels indicated; and with exposed edges folded back to form hems . <br /> 1 . Lay out sheet metal roofing so transverse seams, if required, are made in direction of flow with <br /> higher panels overlapping lower panels . <br /> 2 . Offset transverse seams from each other 12 inches (300 mm) minimum. <br /> 3 . Fold and cleat eaves and transverse seams in the shop. <br /> 4. Form and fabricate sheets, seams, strips, cleats, valleys, ridges, edge treatments, integral flashings, <br /> and other components of metal roofing to profiles, patterns, and drainage arrangements shown on <br /> Drawings and as required for leakproof construction. <br /> D . Expansion Provisions : Fabricate sheet metal roofing to allow for expansion in running work sufficient to <br /> prevent leakage, damage, and deterioration of the Work. Where lapped expansion provisions cannot be <br /> used, form expansion joints of intermeshing hooked flanges, not less than 1 inch (25 mm) deep, filled <br /> with butyl sealant concealed within joints. <br /> E. Sealant Joints : Where movable, nonexpansion-type joints are indicated or required to produce <br /> or proper installation of elastomeric sealant in compliance <br /> weathertight seams, form metal to provide f <br /> with SMACNA standards . <br /> F . Metal Protection: Where dissimilar metals will contact each other, protect against galvanic action by <br /> painting contact surfaces with bituminous coating, by applying self-adhering sheet underlayment to each <br /> contact surface, or by other permanent separation as recommended by fabricator of sheet metal roofing or <br /> manufacturers of the metals in contact. <br /> G. Sheet Metal Accessories : Custom fabricate flashings and trim to comply with recommendations in <br /> SMACNA's "Architectural Sheet Metal Manual" that apply to design, dimensions, metal, and other <br /> characteristics of item indicated. Obtain field measurements for accurate fit before shop fabrication. <br /> 1 . Form exposed sheet metal accessories without excessive oil canning, buckling, and tool marks and <br /> true to line and levels indicated, with exposed edges folded back to form hems . <br /> 2 . Seams : Fabricate nonmoving seams with flat-lock seams . Form seams and seal with elastomeric <br /> sealant unless otherwise recommended by sealant manufacturer for intended use . Rivet joints <br /> where necessary for strength. <br /> 3 . Sealed Joints : Form nonexpansion but movable joints in metal to accommodate elastomeric <br /> sealant. <br /> 4 . Conceal fasteners and expansion provisions where possible . Exposed fasteners are not allowed on <br /> faces of accessories exposed to view. <br /> 5 . Fabricate cleats and attachment devices of sizes as recommended by SMACNA's "Architectural <br /> Sheet Metal Manual" for application, but not less than thickness of metal being secured. <br /> H. Do not use graphite pencils to mark metal surfaces . <br /> Wabasso Beach Park <br /> 07610 - 6 <br /> Indian River County <br /> DAA Project No. 6008 <br />