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MANUSPEC


C. On coastal application (salt water locations within 2,800 feet from direct surf, 1,200 feet from a large bay, or 600 feet from marshes and canals) use Drexmet® Clear Air Dry Edge Coat products on all exposed cut edges to help delay edge creep and corrosion. Follow Drexel Metals Inc. proper instillation procedures.


3.2 Underlayment Installation


A. Self-Adhering Sheet Underlayment: Install self-adhering sheet underlayment wrinkle free on roof sheathing under metal roof panels. Comply with temperature restrictions of underlayment (refer to manufacturer for instillation). Use primer rather than nails for installing underlayment at low temperatures. Apply at locations indicated on drawings, in shingle fashion to shed water, with end laps of no less than 6 inches (150 mm) staggered 24 inches (600 mm) between courses. Overlap side edges not less than 3½ inches (90 mm). Extend underlayment past eave approximately 3/8” to cover substrate. Roll laps with roller. Cover underlayment within 120 days.


3.3 Polyisocyanurate Foam Board Insulation


A. ISO board insulation can be ½” to 8” in thickness B. Bearing plates are not required when using the butterfly clips C. See DMC Engineering for exact specifications


3.4 Metal Roof Panel Installation – General


A. General: Provide metal roof panels of full length from eave to ridge. Anchor metal roof panels and other components of the work securely in place, with provisions for thermal and structural movement a. Field cutting of metal roof panels by torch or saw blade is not permitted b. Mechanically fasten ridge end of metal roof panels and allow eave end free movement due to thermal expansion and contraction.


c. Provide metal Z closures at high-side eave, rake edges, rake walls, and each side of ridge and hip caps.


d. Flash and seal metal roof panels with weather closures at eaves, rakes, and at perimeter of all openings. Fasten with self-tapping screws.


e. Lap metal flashing over metal roof panels to allow moisture to run over and off the material


B. Fasteners: a. Steel Roof Panels: Use #10 min. pancake head fastener sufficiently long enough to penetrate B-Deck per DMC Engineering Report


C. Metal Protection: Where dissimilar metals will contact each other or corrosive substrates, protect against galvanic action by painting contact surfaces with bituminous coating, by applying rubberized-asphalt underlayment to each contact surface, or by other permanent separation as recommended by metal roof panel manufacturer. Fasteners used must be stainless steel.


D. Joint Sealers: Install gaskets, joint fillers, and sealants where indicated and where required for weatherproof performance of metal roof panel assemblies


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