Fire-Resistant Assemblies - USG Corporation

C
Roof/Ceilings
Steel Framed
1 Hour Fire-Rated Construction Steel Bar Joist Framing Acoustical Performance Reference
Construction Detail Description Test Number STC Test Number Index
20"
26"
24"
20 1 ⁄2"
26"
24"
20 1 ⁄2"
28"
30 3 ⁄4"
• 3/4" FR-83 or FR-X1 acoustical ceiling panels UL Des P229 C-6
• DXL, DXLZ or SDXL Susp Exp Grid System
– light fixture, air duct and speakers optional
– 1" to 8" rigid foamed plastic insulation
– 1-1/2" poured gypsum roof deck
– 1/2" gypsum form board or 2" laminated gypsum
plank building units
– steel bar joists
• 5/8" or 3/4" FR-83; 5/8" or 3/4" FR-2; or 3/4" UL Des P235 C-7
FR-X1 acoustical ceiling panels
• DXL, DXLZ or SDXL Susp Exp Grid System
– light fixture, air duct and speakers optional
• 1-1/2" steel roof deck and 1/2" Sheetrock
gypsum panels and insulation
– steel bar joists
• 5/8" FR-4 acoustical ceiling panels UL Des P238 C-8
• DXL, DXLZ or SDXL Susp Exp Grid System
– light fixture, air duct and speakers optional
– 6" insulation batts over ceiling
– 1" fluted steel roof deck and insulation
– steel bar joists
• 5/8" FR-4 acoustical ceiling panels UL Des P244 C-9
• DXL, DXLZ or SDXL Susp Exp Grid System
– light fixture, air duct and speakers optional
– 1-1/2" poured gypsum roof deck over
1/2" gypsum form board or 2" laminated
gypsum plank building units
– steel bar joists
• 5/8" FR-4 acoustical ceiling panels UL Des P245 C-10
• DXL, DXLZ or SDXL Susp Exp Grid System
– light fixture, air duct and speakers optional
– 6" insulation batts over ceiling
– 3/4" noncombustible insulation and 2"
metal-edge concrete plank
– steel bar joists
46 USG Fire-Resistant Assemblies