Exterior: Two layers 5/8” (15.9 mm) DensGlass® Fireguard® Sheathing applied vertically to min. 3-1/2” corrosion resistant 25-gauge (18 mils) steel studs 24” (610 mm) o.c. Base layer attached with 1” (25 mm) Type S corrosion resistant bugle head screws 16” (406 mm) o.c. Face layer attached with 1-5/8” (41 mm) Type S corrosion resistant bugle head screws spaced 8” (203 mm) o.c. Joints staggered. Interior: Two layers 5/8” (15.9 mm) DensArmor Plus® Fireguard® or 5/8” (15.9 mm) ToughRock® Fireguard X® applied vertically to framing. Base layer attached with 1” (25 mm) Type S bugle head screws 16” (406 mm) o.c. Face layer attached with 1-5/8” (41 mm) Type S bugle head screws spaced 16” (406 mm) o.c. in the field and along vertical edges and 12” (305 mm) o.c. to the floor and ceiling runners. Joints staggered. Batt or blanket insulation optional. Sound tested with 3-1/2” fiberglass insulation NLB.
