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Home / Assemblies / UL U113
UL U1133-hr Fire RatingWallLoad-BearingSTC 50
Wood StudMulti-Layer GypsumLoad-Bearing WallDesign

Wood Stud Wall — 2 layers 1/2" Type X

UL-listed 3-hour fire-rated wood stud wall assembly. 2x4 wood studs at 16" o.c., 2 layers of 1/2" Type X gypsum board each side.

Cross-Section Diagram

123455.50"WALL ASSEMBLYSECTION · NOT TO SCALE5 LAYERSsee legend for ① ② ③
Legend
11/2" Type X gypsum board(1/2")
21/2" Type X gypsum board(1/2")
32x4 wood studs at 16" o.c.(3.5")
41/2" Type X gypsum board(1/2")
51/2" Type X gypsum board(1/2")

Specifications

Fire Rating
3-Hour
STC Rating
STC 50
Load Bearing
Yes
Total Thickness
5.5"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U113
Assembly Type
Wall
Test Standard
CAN/ULC-S101
Construction Group
Light Frame
Number of Layers
5 layers

Applicable Codes

IBC 2024 Table 722.1IRC R302.1

Construction Summary

2x4 wood studs at 16" o.c., 2 layers of 1/2" Type X gypsum board each side

Material Layers

LayerMaterialThickness
11/2" Type X gypsum board1/2"
21/2" Type X gypsum board1/2"
32x4 wood studs at 16" o.c.3.5"
41/2" Type X gypsum board1/2"
51/2" Type X gypsum board1/2"

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.