Reference: UL Design U305 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............................34 kg/m2 (7 psf)
Interior Install insulation between studs. Apply one layer of 15.9 mm (5/8") ProRoc™ Type X gypsum board vertically or horizontally with 48 mm (1-7/8") nails spaced 175 mm (7") 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 or horizontally with 48 mm (1-7/8") nails spaced 175 mm (7") o.c. along edges and in the field. Joints must be offset from joints on the opposite side.
