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Home / Assemblies / UL U122
UL U1224-hr Fire RatingWallLoad-BearingSTC 55
Wood StudMulti-Layer GypsumResilient ChannelLoad-Bearing WallHigh STCDesign

Wood Stud Wall — 4 layers 1/2" Type X on resilient channels

UL-listed 4-hour fire-rated wood stud wall assembly. 2x4 wood studs at 16" o.c., 4 layers of 1/2" Type X gypsum board each side on resilient channels.

Cross-Section Diagram

123456789108.38"WALL ASSEMBLYSECTION · NOT TO SCALE10 LAYERSsee legend for ① ② ③
Legend
11/2" Type X gypsum board(1/2")
21/2" Type X gypsum board(1/2")
31/2" Type X gypsum board(1/2")
41/2" Type X gypsum board(1/2")
5Resilient channels at 24" o.c.(7/8")
62x4 wood studs at 16" o.c.(3.5")
71/2" Type X gypsum board(1/2")
81/2" Type X gypsum board(1/2")
91/2" Type X gypsum board(1/2")
101/2" Type X gypsum board(1/2")

Specifications

Fire Rating
4-Hour
STC Rating
STC 55
Load Bearing
Yes
Total Thickness
8.375"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U122
Assembly Type
Wall
Test Standard
ASTM E119
Construction Group
Light Frame
Number of Layers
10 layers

Applicable Codes

IBC 2024 Table 722.1IBC 2021 §722

Construction Summary

2x4 wood studs at 16" o.c., 4 layers of 1/2" Type X gypsum board each side on resilient channels

Material Layers

LayerMaterialThickness
11/2" Type X gypsum board1/2"
21/2" Type X gypsum board1/2"
31/2" Type X gypsum board1/2"
41/2" Type X gypsum board1/2"
5Resilient channels at 24" o.c.7/8"
62x4 wood studs at 16" o.c.3.5"
71/2" Type X gypsum board1/2"
81/2" Type X gypsum board1/2"
91/2" Type X gypsum board1/2"
101/2" 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.