Fire-Resistant Assemblies - USG Corporation

B
Floor/Ceilings
Steel Framed
2 Hour Fire-Rated Construction Steel Bar Joist Framing Acoustical Performance Reference
Construction Detail Description Test Number STC Test Number Index
21"
24"
14"
21 3 ⁄8"
24 3 ⁄8"
26"
• 5/8" Sheetrock Firecode C Core gypsum UL Des G529 B-17
panel
• DGLW Drywall Suspension System
– light fixture and air duct optional
– 3-1/4" concrete deck on riblath or corrugated
steel deck
– also applies to 5/8" panels and
2-3/4" concrete slab
– steel bar joists, 24", o.c.
• optional veneer plaster
– 3.4 lb diamond mesh lath and 5/8" 100:2-100:3 BMS-92 B-18
gypsum-sand plaster
– 3/4" cold rolled channel furred or suspended
– 2-1/2" concrete on riblath or 28 gauge
corrugated steel deck
– steel bar joist
• 5/8" or 3/4" 12" x 12"; or 24" FR-83 acoustical UL Des G002 B-19
ceiling panels in concealed Z-spline grid system
– light fixture and air duct optional
– 2-1/2" concrete deck on riblath
– steel bar joists, 24" o.c.
• 3/4" 12" x 12" or 24"; or 24" x 24" FR-83
acoustical ceiling panels
• Concealed Grid System
– light fixture and air duct optional
– 2-1/2" concrete deck on riblath
– steel bar joists, 24" o.c.
UL Des G007 B-20
• 5/8" or 3/4" 12" x 12"; or 24" x 24" FR-83 UL Des G008 B-21
acoustical ceiling panels
• DXL, DXLZ or SDXL Concealed Grid System
– light fixture and air duct optional
– 2-1/2" concrete deck on riblath over
– steel bar joists, 24" o.c.
27 USG Fire-Resistant Assemblies