Reference: UL Design U425 (1 hour) Exterior Wall Fire-Rated System
1-Hour Fire-Resistance Rating Cavity thickness..........89 mm (3-1/2")
Wall thickness.............121 mm (4-3/4")
Weight............................29 kg/m2 (6 psf)
Interior Install insulation between studs. Apply one layer of 15.9 mm (5/8") ProRoc™ Type X gypsum board vertically to interior side with 25 mm (1") Type S-12 steel screws spaced 300 mm (12") o.c. along edges and in the field. Joints must be offset from joints on the opposite side. Tape and finish joints.
Exterior Apply one layer of 15.9 mm (5/8") GlasRoc® Sheathing Type X vertically to exterior side with 25 mm (1") screws spaced 300 mm (12") o.c. along edges and in the field. Joints must be offset from joints on the opposite side.
