UL L1343-hr Fire RatingRoof/CeilingLoad-Bearing
Gypsum BoardDesign
Wood Truss Roof/Ceiling — 3 layers 5/8" Type X gypsum board
UL-listed 3-hour fire-rated wood truss roof/ceiling assembly. 2x10 wood rafters at 16" o.c. with R-49 blown cellulose, 3 layers of 5/8" Type X gypsum board ceiling, 7/16" OSB sheathing.
Cross-Section Diagram
Legend
1Roof covering(varies)
27/16" OSB sheathing(7/16")
32x10 wood rafters at 16" o.c.(12"-24")
4R-49 blown cellulose
55/8" Type X gypsum board(5/8")
65/8" Type X gypsum board(5/8")
75/8" Type X gypsum board(5/8")
Specifications
Fire Rating
3-Hour
Load Bearing
Yes
Total Thickness
15.88"
Applicable Codes
IBC 2021 Table 722.1
Construction Summary
2x10 wood rafters at 16" o.c. with R-49 blown cellulose, 3 layers of 5/8" Type X gypsum board ceiling, 7/16" OSB sheathing
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.