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 1 ⁄2"
27 3 ⁄8"
22 1 ⁄2"
26"
23 1 ⁄4"
23"
26"
23 1 ⁄4"
23"
• 3/4" 12" x 12"; or 24" FR-83 acoustical ceiling UL Des G040 B-22
panels
• DXL, DXLA, DXLZA, DXLA, DXLZ, SDXL, SDXLA
or ZXLA Concealed Grid System
– light fixture and air duct optional
– 2-1/2" concrete deck on riblath
– steel bar joists, 24" o.c.
• 5/8" FR-81 or FR-4; 5/8" or 3/4" FR-83 or FR-2; UL Des G202 B-23
or 3/4" FR-X1 acoustical ceiling panels
• DXL, DXLZ or SDXL Susp Exp Grid System
– light fixture and air duct optional
– 2-1/2" concrete deck on riblath
– steel bar joists, 24" o.c.
• 5/8" or 3/4" FR-83; 5/8" or 3/4" FR-2; or 3/4" UL Des G203 DXLT Susp Exp System may be used B-24
Astro-FR acoustical ceiling panels
• DXL, DXLZ, SDXL or DXLT Susp Exp Grid System
– light fixture and air duct optional
– 2-1/2" concrete deck on riblath
– steel bar joists, 24" o.c.
• 5/8" FR-81, FR-4 or M; 5/8" or 3/4" FR-83 or UL Des G204 B-25
FR-2; 3/4" FR-X1; or 3/4" Astro-FR acoustical
ceiling panels
• DXL, DXLA, DXLZ, DXLZA, SDXL, SDXLA or
XLA Susp Exp Grid System
– light fixture and air duct optional
– 2-1/2" concrete deck on riblath
– steel bar joists, 30" o.c.
• 5/8" FR-81 or FR-4; 5/8" or 3/4" FR-83 or UL Des G215 B-26
FR-2; 3/4" FR-X1; or 3/4" Astro-FR acoustical
ceiling panels
• DXL, DXLZ or SDXL Susp Exp Grid System
– light fixture and air duct optional
– 2-1/2" concrete deck on riblath
– steel bar joists, 24" o.c.
28 USG Fire-Resistant Assemblies
instead, but fire rating is limited to
1-1/2-hour.