5/8” (15.9 mm) ToughRock® Fireguard X® or 5/8” (15.9 mm) DensArmor Plus® Fireguard® gypsum panels applied vertically or horizontally to each side of 3-5/8” (92 mm) 25 gauge (18 mils) steel studs 24” (610 mm) o.c. with 1” (25 mm) Type S drywall screws 8” (203 mm) o.c. at vertical joints and 12” (305 mm) o.c. at wall perimeter and intermediate studs. Face Layer: 5/8” (15.9 mm) ToughRock® Fireguard X™ or 5/8” (15.9 mm) DensArmor Plus Fireguard gypsum panels applied vertically or horizontally to one side with 1-5/8” (41 mm) Type S drywall screws 12” (305 mm) o.c. Joints staggered 24″ each layer and opposite sides. Sound Tested with 3-1/2” (89 mm) fiberglass insulation friction fit in stud space
