Fire-Resistant Assemblies - USG Corporation

B
Floor/Ceilings
Wood Framed
1 Hour Fire-Rated Construction Dimensional Lumber Acoustical Performance Reference
Construction Detail Description Test Number STC IIC Test Number Index
25 1 ⁄2"
• 5/8" FR-4 acoustical ceiling panels UL Des L212 B-62
• DXL, DXLZ or SDXL Susp Exp Grid System
– light fixture, air duct and speakers optional
– 1" nominal wood sub or 15/32" wood sub
– 1" nominal or 19/32" finished floor or floor
topping mixture
– 2 x 10 wood joists 16" o.c.
clg. wt. 3 • 5/8" Sheetrock Firecode Core gypsum panels
– joints finished
– damper optional
– 19/32" T&G wood subfloor
– 2 x 10 wood joist 16" o.c.
UL Des L501 B-63
11 • optional SRM-25 sound mat
• 3/4" Levelrock floor underlayment
1 ⁄8"
clg. wt. 3 • 1/2" Sheetrock Firecode C Core gypsum UL Des L502, B-64
panels
– 2 x 10 wood joist 16" o.c.
– RC-1 or equivalent space 24" o.c.
– 19/32" T&G wood subfloor perpendicular
• optional SRM-25 or SRB sound mat
L514
11
• 3/4" Levelrock floor underlayment
5 ⁄8"
clg. wt. 3 • 5/8" Sheetrock Firecode C Core
gypsum panel
• 3/4" Levelrock floor underlayment
– 3/4" plywood perpendicular
– 9-1/2" “I” wood joist spaced max 24" o.c.
– metal furring channel 24" o.c.
UL Des L530 B-65
13
– 1-1/4" ThermaFiber insulation laid over channel
below joist
– joints finished
3 ⁄8"
clg. wt. 3 • 1/2" or 5/8" Sheetrock Firecode C Core
gypsum panel joints finished
– 9" “I” wood joist 24" o.c.
– 26 gauge metal furring channel
– 1" nominal ThermaFiber SAFB
– 23/32" T&G wood subfloor
UL Des L531 B-66
12
• optional SRM-25 or SRB sound mat
• 3/4" minimum Levelrock floor underlayment
7 ⁄8"
36 USG Fire-Resistant Assemblies