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Any UL Class A, B or C Roofing System (TGFU) or prepared Roof Covering (TFWZ)
Nom. 15/32" Thick Wood Structural Panels, Min. Grade "C-D" or "Sheathing"
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
Any UL Class 0 or Class 1 Flexible Air Duct
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.
3-1/2" Thick Min. Batts and Blankets draped over Resilient Channel and Gypsum Board Ceiling Membrane
1/2" Deep, 25ga., Installed perpendicular to the Trusses, Spaced 16" Max. O.C.
5/8" Thick Gypsum Board (UL Type ULIX™)