Fire-Resistant Assemblies - USG Corporation

B
Floor/Ceilings
Steel Framed
1 Hour Fire-Rated Construction Steel Bar Joist Framing Acoustical Performance Reference
Construction Detail Description Test Number STC Test Number Index
clg. wt. 2 • 1/2" Sheetrock Firecode C Core
gypsum panels
– 3-5/8" 25 gauge steel studs 24" o.c.
– studs wire tied to open web steel joists 24" o.c.
– joints finished
GA-FC-1105 B-1
18 – 2-1/2" concrete on riblath over joist
5 ⁄8"
clg. wt. 4 • 5/8" red top ® brand gypsum plaster, sanded
1:2-1:3
– 3/8" riblath metal lath
GA-FC-1180 B-2
14 – 2" concrete on riblath over joist
– steel bar joists 24" o.c.
5 ⁄8"
18 1 ⁄2"
1-1/2 Hour Fire-Rated Construction
18 5 ⁄8"
22"
• 5/8" or 3/4" FR-83; 5/8" or 3/4" FR-2; or UL Des G201 B-3
3/4" FR-X1 acoustical ceiling panels
• DXL, DXLA, DXLZ, DXLZA, SDXL, SDXLA or
ZXLA Susp Exp Grid System
– light fixture and speakers optional
– 2" concrete on riblath over bar joists
• USG DGL drywall suspension system UL Des G528 B-4
• 1/2" or 5/8" Sheetrock Firecode C Core
gypsum panels
– joints finished
– 2-1/2" concrete on riblath over bar joist
• 1/2" x 2' x 4' FC-CB gypsum panels UL Des G259 B-5
• DXL, DXLA, DXLH, DXLZ, SDLX, SDXLA, ZXLA
Susp Exp Grid System
– 2-1/2" concrete on riblath over bar joist
24 USG Fire-Resistant Assemblies