Fire-Resistant Assemblies - USG Corporation

C
Roof/Ceilings
Steel Framed
1-1/2 Hour Fire-Rated Construction Steel Bar Joist Framing Acoustical Performance Reference
Construction Detail Description Test Number STC Test Number Index
23 1 ⁄2"
23 5 ⁄8"
27 5 ⁄8"
2 Hour Fire-Rated Construction
23"
3 Hour Fire-Rated Construction
32"
• 5/8" or 3/4" FR-83 or 3/4" FR-X1 acoustical UL Des P207 C-16
ceiling panels
• 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; 5/8" or 3/4" FR-83 or FR-2; or 3/4" UL Des P230 DXLT or DXLTZ Susp Exp Grid System C-17
FR-X1, AP, AP-3, Astro-FR (1 hour rating)
acoustical ceiling panels
• DXL, DXLA, DXLZ, DXLZA, SDXL, SDXLA, ZXLA,
DXLT, DXLTZ or DXLP (with Types PAR, PARP,
PAS, PASP, PSR, PSRP, PSS and PSSP metal
ceiling panels)
• USG DGL Drywall Suspension System
– light fixture, air duct and speakers optional
• 1-1/2" steel roof deck and 5/8" Sheetrock
Firecode Core gypsum panels
– steel bar joists
• 3/4" FR-83 or FR-X1 acoustical ceiling panels UL Des P213 C-18
• DXL, DXLZ or SDXL Susp Exp Grid System
– light fixture, air duct and speakers optional
– 2" precast concrete units and 3/4"
noncombustible insulation
– steel bar joists
• 5/8" FR-4 or FR-83 or 3/4" FR-83 or FR-X1 UL Des P237 C-19
acoustical ceiling panels
• DXL, DXLA, DXLZ, DXLZA, SDXL, SDXLA or
ZXLA Susp Exp Grid System
– light fixture, air duct and speakers optional
– insulation ceiling membrane below joists
• USG DGL Drywall Suspension System
• 1/2" Sheetrock Firecode C Core gypsum
panels
– 6" glass fiber insulation installed on top of
drywall suspension system
– joints finished
– 1" to 3" roof insulation
– 1" deep steel roof deck
– 8" deep steel bar joists
• optional veneer plaster system
48 USG Fire-Resistant Assemblies
may be used, but fire rating is limited to
1 hour. When the FR-2 ceiling panels are
used, the fire rating is limited to 1 hour.