Three layers of 5/8” (15.9 mm) ToughRock® Fireguard X® Products or 5/8” (15.9 mm) DensArmor Plus® Fireguard® gypsum panels around minimum W8 x 24 (metric W200 x 36) beam. Base Layer: Attached with 1” (25 mm) Type S drywall screws 16” (406 mm) o.c. Middle Layer: Attached with 1-5/8” (41 mm) Type S drywall screws 12” (305 mm) o.c. Face Layer: Attached with 2-1/4” (57 mm) Type S drywall screws 5/8” (15.9 mm) o.c. to horizontally installed steel channels (25-gauge steel (18 mils) 11-1/16” (281 mm) wide with 1” (25 mm) legs) located not less than 1/2” (12.7 mm) from beam flanges. Upper channels secured to steel deck units with 1/2” (12.7 mm) Type S pan-head screws spaced 12” (305 mm) o.c. Brackets formed of steel channels spaced 24” (610 mm) o.c. suspended from the upper channels with 1/2” (12.7 mm) Type S pan-head screws and supported steel channels installed at lower corners of brackets. 20-gauge (33 mils) hexagonal steel mesh fitted between middle and face layers of gypsum board along bottom and extending 1-1/2” (38 mm) onto sides. Outside corners of gypsum board protected by steel corner beads crimped or nailed to the gypsum board. 1-1/2” (38 mm) fluted steel deck units welded to top of beam and supporting minimum 2-1/2” (64 mm) concrete. (Three-hour restrained or two-hour unrestrained beam.)
