Exterior Side: 5/8” (15.9 mm) DensGlass® Fireguard® Sheathing applied vertically or horizontally to 2”x 4” wood studs 24” (610 mm) o.c. with 1-7/8” (48 mm) galvanized roofing nails 7” (178 mm) o.c. Joints of gypsum sheathing may be left untreated. Exterior cladding to be attached through sheathing to studs. Interior Side: 5/8” (15.9 mm) ToughRock® Fireguard X® Products or 5/8” (15.9 mm) DensArmor Plus® Fireguard® gypsum panels applied vertically or horizontally to studs with 1-7/8” (48 mm) 6d coated nails 7” (178 mm) o.c.
