Fire-Resistant Assemblies - USG Corporation

B
Floor/Ceilings
Structural Concrete
1-1/2 Hour Fire-Rated Construction Acoustical Performance Reference
Construction Detail Description Test Number STC Test Number Index
16 3 ⁄8"
2 Hour Fire-Rated Construction
• 5/8" FR-4, M or FR-81; 5/8" or 3/4" FR-83; UL Des D209 B-90
or 3/4" FR-X1 acoustical ceiling panels or
1/2" FC-CB gypsum lay-in tile
• DXL, DXLA, DXLZ, DXLZA, SDXL, SDXLA or
ZXLA Susp Exp Grid System
– light fixture and speakers optional
– 2-1/2" concrete on fluted or cellular steel deck
clg. wt. 3 • 5/8" Sheetrock Firecode C Core gypsum UL Des J502, B-91
panels J503
– metal furring channel 24" o.c.
9 1 ⁄2"
8 1 ⁄2"
8 3 ⁄4"
– joints finished
– 2" precast normal weight (J502) or lightweight
(UL Des J503) concrete units with 6" deep stems
48" o.c.
• USG DGL Drywall Suspension System
(UL Des J502)
• 1/2" Levelrock floor underlayment UL Des J991 B-92
• optional SRM-25 or SRB sound mat
– 8" minimum thick normal weight precast
concrete units
• 1/2" Levelrock floor underlayment UL Des J994 B-93
– 8" minimum thick light weight precast
concrete units
clg. wt. 3 • 5/8" Sheetrock Firecode Core gypsum GA-FC-2120 B-94
panels
– metal furring channel 24" o.c.
– joints finished
– joist leg 10" deep
14"
24 3 ⁄8"
• 3/4" FR-83 acoustical ceiling panels
• DXL, DXLZ or SDXL Susp Exp Grid System
– light fixture and air duct optional
– 2-1/2" concrete deck deck on fluted or cellular
steel floor
UL Des D215 B-95
42 USG Fire-Resistant Assemblies