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Home / Assemblies / UL W107
UL W1072-hr Fire RatingFloor/CeilingLoad-BearingSTC 44
Wood JoistGypsum BoardDesign

Wood Joist Floor/Ceiling — 2 layers 5/8" Type C gypsum board

UL-listed 2-hour fire-rated wood joist floor/ceiling assembly. 2x10 wood joists at 16" o.c., 2 layers of 5/8" Type C gypsum board ceiling.

Cross-Section Diagram

12345FLOOR/CEILING ASSEMBLYSECTION · NOT TO SCALE5 LAYERSsee legend for ① ② ③
Legend
1Floor covering(varies)
23/4" plywood subfloor(3/4")
32x10 wood joists at 16" o.c.(9.25")
45/8" Type C gypsum board(5/8")
55/8" Type C gypsum board(5/8")

Specifications

Fire Rating
2-Hour
STC Rating
STC 44
Load Bearing
Yes
Total Thickness
12"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
W107
Assembly Type
Floor/Ceiling
Test Standard
ASTM E119
Construction Group
Light Frame
Number of Layers
5 layers

Applicable Codes

NFPA 5000

Construction Summary

2x10 wood joists at 16" o.c., 2 layers of 5/8" Type C gypsum board ceiling

Material Layers

LayerMaterialThickness
1Floor coveringvaries
23/4" plywood subfloor3/4"
32x10 wood joists at 16" o.c.9.25"
45/8" Type C gypsum board5/8"
55/8" Type C gypsum board5/8"

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.