Fire-Resistant Assemblies - USG Corporation

8 1/2˝
A
2 Hour Fire-Rated Construction Chase Walls Acoustical Performance Reference
Construction Detail Description Test Number STC Test Number Index
wt. 12 • 5/8" Sheetrock Firecode Core gypsum
panels, each side or Fiberock panels
UL Des U420 52 RAL-TL-76-162
A-41
– 1-5/8" 25 gauge steel studs 24" o.c. in two
57 RAL-TL-76-156
12"
rows spaced 6-1/4" apart
– 5/8" gypsum panel gussets or steel runner
braces spanning chase screw-attached to studs
– face layer joints finished
Based on 3-1/2" insulation one side
8 ½˝
8 ½"
Partitions
Steel Framed
• 5/8" Sheetrock Firecode Core gypsum panels
– 2-1/2" 25 gauge steel studs 24" o.c. min 1"
apart on separate runners
– bracing along same row of studs
– optional insulation
• 5/8" Sheetrock Firecode Core gypsum panels
– 2-1/2" 25 gauge steel studs 24" o.c. min 1"
apart on separate runners
– bracing along same row of studs
– optional insulation
3 Hour Fire-Rated Construction
wt. 13 • 1/2" Sheetrock Firecode C Core gypsum panels
– 1-5/8" 25 gauge steel studs 24" o.c. in two rows
– steel truss member
– gypsum panel gussets or steel runner braces
8
spanning chase screw-attached to studs
– face layer joints finished
– 2 hr. rating applies with two layers panels
each side
– 1 hr. rating applies with single layer 5/8"
panels each side
1 ⁄4"
wt. 13 • 3/4" Sheetrock Ultracode Core gypsum panels
– 1-5/8" 25 gauge studs 24" o.c. in two rows
– steel truss member
– gypsum panel gussets or steel runner braces
8
spanning chase screw-attached to studs
– face layer joints finished
1 ⁄4"
16 USG Fire-Resistant Assemblies
UL Des U493 A-42
UL Des U493 66 STC-050819
Based on 3-1/2” glass fiber insulation in
both rows of studs
A-43
UL Des U436 A-44
UL Des U436 A-45