Reference:
UL Design X528
Exterior Wall Fire-Rated System
2-Hour
Fire-Resistance Rating
Steel Columns
Position steel studs at column corners.
Steel studs to be 1/2" (12.7 mm) less than assembly
height. Apply a base layer of 5/8" (15.9
mm) GlasRoc® Sheathing Type
X vertically with 1" (25
mm) Phillips pan head screws spaced 24" (600 mm)
o.c. Apply a face layer of 5/8" (15.9
mm) GlasRoc® Sheathing Type
X vertically around the perimeter with 1-3/4" (44
mm) Phillips pan head screws spaced 12" (300 mm)
o.c. Apply corner bead with 1-5/8" (41 mm) screws
spaced 12" (300
mm) o.c. Tape and finish joints.
Additional UL Design Listings
for Beam & Column Systems:
Beam Protection: N501 and N505
Column Protection: X508, X516, X517, X525 and X526
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