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Home / Assemblies / UL U243
UL U2434-hr Fire RatingWallLoad-BearingSTC 45
Steel StudMulti-Layer GypsumLoad-Bearing WallDesign

Steel Stud Wall — 4 layers 1/2" Type X

UL-listed 4-hour fire-rated steel stud wall assembly. 3-5/8" steel studs at 16" o.c., 4 layers of 1/2" Type X gypsum board each side.

Cross-Section Diagram

1234567897.63"WALL ASSEMBLYSECTION · NOT TO SCALE9 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")
53-5/8" steel studs at 16" o.c.(3.625")
61/2" Type X gypsum board(1/2")
71/2" Type X gypsum board(1/2")
81/2" Type X gypsum board(1/2")
91/2" Type X gypsum board(1/2")

Specifications

Fire Rating
4-Hour
STC Rating
STC 45
Load Bearing
Yes
Total Thickness
7.625"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U243
Assembly Type
Wall
Test Standard
UL 263
Construction Group
Light Frame
Number of Layers
9 layers

Applicable Codes

IBC 2024 Table 722.1

Construction Summary

3-5/8" steel studs at 16" o.c., 4 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"
31/2" Type X gypsum board1/2"
41/2" Type X gypsum board1/2"
53-5/8" steel studs at 16" o.c.3.625"
61/2" Type X gypsum board1/2"
71/2" Type X gypsum board1/2"
81/2" Type X gypsum board1/2"
91/2" 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.