1/2” (12.7 mm) ToughRock® Fireguard C® or 1/2” (12.7 mm) DensArmor Plus® Fireguard C® gypsum panel applied perpendicular to resilient channels 24” (610 mm) o.c. with 1” (25 mm) Type S drywall screws 12” (305 mm) o.c. in field. Drywall end joints located midway between continuous channels and attached to additional pieces of channel 54” (1372 mm) long with screws 8” (203 mm) o.c. Resilient channels wire tied 24” (610 mm) o.c. to open web steel joists supporting 3/8” (10 mm) rib steel lath or 9/16” (14 mm) deep 28-gauge (15 mils) corrugated steel and 2-1/2” (64 mm) concrete slab measured from top of flute.
