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ROOF DESIGN Wood Planking —Insulation above the wood deck may be necessary to prevent —Min.1" (25 mm)nominal thickness. condensation from adversely affecting the roof. —Tongue&groove or splined edges required. —Insulation above the wood deck may be necessary to prevent —All boards must have a bearing on rafters at each end and be condensation from adversely affecting the deck. securely fastened. —Must meet minimum pull out values —Lumber should be kiln dried. —Minimum 5 test pulls per 1,000 sq.ft.(93 sq.m.) —Check compatibility of preservatives or fire retardants used to —Panels must be installed with a 1/8"to 1/4"(3 mm—6 mm) treat decking with roofing materials. gap between panels and must match vertically at joints to within 1/8" (3 mm). —Decking should be kept dry and roofed promptly after installation. —Moisture content not to exceed 16% —Decking should be kept dry and roofed promptly after installation. Plywood Note:OSB values vary greatly by manufacturer and with exposure —Min.15/32" (12 mm)thickness. to moisture.OSB exposed to daily condensation or nightly dew has —Deck must be attached with approved fasteners at required seen significant loss of pull out values.GAF will not accept any spacing. liability for substandard or moisture-damaged OSB. —Plywood sheathing must comply with roof deck design requirements and local codes for roof deck construction. Gypsum Concrete —The panels must be secured in accordance with APA- —Min.2" (51 mm)thickness. The Engineered Wood Association Construction Guide —Steel reinforcing mesh and permanent form boards required for recommendations.Tongue and groove edges or full blocking poured-in-place monolithic decks. required. —Plywood sheathing must be C-D Exposure 1 APA Rated, —Steel-reinforced edges required for pre-cast decking units. minimum 4 ply. —An average fastener withdrawal resistance as recommended —Plywood sheathing must comply with Structural 1 performance by the fastener manufacturer must be obtained.If proper rating. mechanical attachment cannot be achieved,please call 800- 766-3411 for assistance with installation recommendations. —Panels must be installed with a 1/8"to 1/4" (3 mm—6 mm) —If surface is either wet or frozen,a poured gypsum deck is not gap between panels and must match vertically at joints to suitable to receive a roof. within 1/8" (3 mm). —Moisture content not to exceed 16% —Decking should be kept dry and roofed promptly after Cementitious Wood Fiber installation. —Min.2"(51 mm)thickness. —Must be installed over joists not greater than 24" (610 mm) —Tongue and groove panel edges required. O.C. —Should not be installed over high humidity occupancies. —Insulation above the wood deck may be necessary to prevent —All structural wood fiber deck panels must be anchored against condensation from adversely affecting the deck uplift and lateral movement. —Must meet minimum pull out values —Minimum 5 test pulls per 1,000 sq.ft.(93 sq.m.) lightweight Insulating Concrete(LWIC) —Min.2" (51 mm)thickness. Oriented Strand Board(OSB) —Cellular lightweight insulating concrete decks can be installed —Min.15/32" (12 mm)thickness. over non-slotted,galvanized metal decking designed for cellular —Deck must be attached with approved fasteners at required lightweight insulating concrete or structural concrete. spacing.Consult local building codes for specific requirements. —Aggregate lightweight insulating concrete decks must be —OSB must comply with roof deck design requirements and local installed over permanent venting steel forms. codes for roof deck construction. —Insulating concrete installed over structural concrete or —The panels must be secured in accordance with APA- existing roof membrane substrates requires a GAF Field p Services Manager's or Director's approval. The Engineered Wood Association Construction Guide recommendations.Tongue and groove edges or full blocking —Lightweight insulating concrete decks are required to have a required. minimum compressive strength of 125 psi(9 kg/cm)and a density of 22 pcf(208 grams/cubic meter).Individual deck —OSB must comply with Structural 1 performance rating. manufacturers'standards apply when their specifications exceed —Oriented strand board(OSB)must be C-D Exposure 1 APA these GAF minimum thicknesses,compressive strengths,and Rated. density requirements. —Must be installed over joists not greater than 24" (610 mm) O.C. 13