Fire-Resistant Assemblies - USG Corporation

C
Roof/Ceilings
Steel Framed
1 Hour Fire-Rated Construction Steel Roof Deck Acoustical Performance Reference
Construction Detail Description Test Number STC Test Number Index
28 3 ⁄16"
1-1/2 Hour Fire-Rated Construction
19 5 ⁄8"
20 3 ⁄8"
19 5 ⁄8"
20 3 ⁄8"
3 Hour Fire-Rated Construction
29 1 ⁄8"
28 3 ⁄16"
to
29 7 ⁄8"
• 5/8" or 3/4" FR-83; 5/8" or 3/4" FR-2; or 3/4" UL Des P257 C-28
FR-X1 acoustical ceiling panels
• DXL, DXLA, DXLZ, DXLZA, SDXL, ZXLA or SDXLA
Susp Exp Grid System
– light fixture and air duct optional
– 2-7/16" noncombustible insulation (two layers)
• 1/2" gypsum sheathing
– 9/16" deep steel roof deck
– 7-1/4" deep steel C-joists
– suspended 3.4 lb diamond mesh metal lath NBS-57 C-29
• 3/4" 100:2-100:3 gypsum-sand plaster
– rib type steel roof deck
– 1" wood-fiber insulation
– suspended 3.4 lb diamond mesh metal lath NBS-58 C-30
• 1" 100:2 gypsum-sand plaster
– rib type steel roof deck
– 1-1/2" wood-fiber insulation
• 5/8" FR-4; or 3/4" FR-83 or FR-81 acoustical UL Des P268 C-31
ceiling panels
• DXL, DXLA, DXLZ, DXLZA, SDXL, SDXLA or ZXLA
Susp Exp Grid System
– light fixture and air duct optional
– 6" glass fiber insulation
– steel roof deck
– 4" glass fiber insulation
– 8" deep Z purlins
• 5/8" FR-4 or FR-83; or 3/4" FR-83 acoustical UL Des P269 C-32
ceiling panels
• DXL, DXLZ, or SDXL Susp Exp Grid System
– light fixture and air duct optional
– 2-1/4" insulating concrete
– 1" foamed plastic insulation
– steel roof deck
51 USG Fire-Resistant Assemblies