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1 layer 3/4" Thick, USG Structural Panel Concrete Subfloor (USGSP), with long edges tongue and grooved, long dimension of panels to be perpendicular to Joists (UL Type USGSP)
1 layer 3-1/2" [89 mm] steel studs, 20 ga. (0.033"), 24" [610 mm] O.C.
1 layer 3-1/2" [89 mm] Fiberglass insulation
1 layer 5/8" [15.9 mm] Sheetrock® Gypsum Panel (UL Type SCX)