Base Layer: 1/2” (12.7 mm) ToughRock Fireguard C gypsum board or 1/2” (12.7 mm) DensArmor Plus Fireguard C® applied vertically to each side of 1-5/8” (41 mm) 18 mil steel studs 24” (610 mm) o.c. with 1” (25 mm) Type S drywall screws 36” (914 mm) o.c. Second Layer: 1/2” (12.7 mm) ToughRock Fireguard C gypsum panel or 1/2” (12.7 mm) DensArmor Plus Fireguard C applied vertically to each side with 1-5/8” (41 mm) Type S drywall screws 24” (610 mm) o.c. Face Layer: 1/2” (12.7 mm) ToughRock Fireguard C gypsum board or 1/2” (12.7 mm) DensArmor Plus Fireguard C gypsum panel applied vertically or horizontally to each side with 2-1/4” (57 mm) Type S drywall screws 12” (305 mm) o.c. and 1-1/2” (38 mm) Type G drywall screws midway between studs 1-1/2” (38 mm) above and below horizontal joints. Joints staggered. Sound Tested with 1-1/2” (38 mm) glass fiber insulation, friction fit in stud space. Non-Load Bearing
