UL W1154-hr Fire RatingFloor/CeilingLoad-BearingSTC 41
Wood JoistMulti-Layer GypsumFiberglass BattDesign
Wood Joist Floor/Ceiling — 4 layers 5/8" Type C gypsum board
UL-listed 4-hour fire-rated wood joist floor/ceiling assembly. 2x10 wood joists at 16" o.c. with R-30 fiberglass batt, 4 layers of 5/8" Type C gypsum board ceiling.
Cross-Section Diagram
Legend
1Floor covering(varies)
21-1/8" T&G plywood subfloor(1-1/8")
32x10 wood joists at 16" o.c.(9.25")
4R-30 fiberglass batt
55/8" Type C gypsum board(5/8")
65/8" Type C gypsum board(5/8")
75/8" Type C gypsum board(5/8")
85/8" Type C gypsum board(5/8")
Specifications
Fire Rating
4-Hour
STC Rating
STC 41
Load Bearing
Yes
Total Thickness
13.25"
Applicable Codes
IRC R302.1
Construction Summary
2x10 wood joists at 16" o.c. with R-30 fiberglass batt, 4 layers of 5/8" Type C gypsum board ceiling
Material Layers
Important Notice
This assembly listing is for reference only. Always verify against the current UL Product iQ database before specifying in construction documents. Material substitutions may void the fire rating. Consult with a qualified fire protection engineer for project-specific requirements.