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1 layer Any UL Class A, B or C Roofing System (TGFU) or prepared Roof Covering (TFWZ)
1 layer Nom. 15/32" Thick Wood Structural Panels, Min. Grade "C-D" or "Sheathing"
1 layer Pitched or Parallel Chord Wood Trusses, Spaced 24" Max. O.C., Fabricated from Nom. 2x4 Lumber, Oriented Vertically or Horizontally. Min. Truss depth shall be 5-1/4" with a Min. Roof Slope of 3/12
1 layer Any UL Class 0 or Class 1 Flexible Air Duct
1 layer Max. Nom. Area, 324 SQ IN., Max. square size, 18" by 18", Rectangular sizes not to exceed 324 SQ IN. with width of 18" Max., Damper height 14" Max.
1 layer 3-1/2" Thick Min. Batts and Blankets draped over Resilient Channel and Gypsum Board Ceiling Membrane
1 layer 1/2" Deep, 25ga., Installed perpendicular to the Trusses, Spaced 16" Max. O.C.
1 layer 5/8" [15.9 mm] Sheetrock® EcoSmart Gypsum Panel (UL Type ULIX™)