Three layers of 5/8” (15.9 mm) ToughRock® Fireguard C® gypsum board or 5/8” (15.9 mm) DensArmor Plus® Fireguard C® gypsum panel, screw-attached to 1-5/8” (41 mm) steel studs located at each corner of W10 x 49 (metric W250 x 73) column. Base Layer: Attached with 1” (25 mm) Type S drywall screws 24” (610 mm) o.c. Second Layer: Attached with 1-5/8” (41 mm) Type S drywall screws 12” (305 mm) o.c. and 18-gauge (43 mils) wire tied 24” (610 mm) o.c. Face Layer: Attached with 2-1/4” (57 mm) Type S drywall screws 12” (305 mm) o.c. and 1-1/4” (32 mm) corner bead at each corner nailed with 1-7/8” (48 mm) 6d coated nails 12” (305 mm) o.c.
