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Home / Assemblies / UL U290
UL U2904-hr Fire RatingWallSTC 43
Steel StudMulti-Layer GypsumPartitionDesign

Steel Stud Wall — 4 layers 5/8" Type C

UL-listed 4-hour fire-rated steel stud wall assembly. 6" steel studs at 24" o.c., 4 layers of 5/8" Type C gypsum board each side.

Cross-Section Diagram

12345678911.00"WALL ASSEMBLYSECTION · NOT TO SCALE9 LAYERSsee legend for ① ② ③
Legend
15/8" Type C gypsum board(5/8")
25/8" Type C gypsum board(5/8")
35/8" Type C gypsum board(5/8")
45/8" Type C gypsum board(5/8")
56" steel studs at 24" o.c.(6.0")
65/8" Type C gypsum board(5/8")
75/8" Type C gypsum board(5/8")
85/8" Type C gypsum board(5/8")
95/8" Type C gypsum board(5/8")

Specifications

Fire Rating
4-Hour
STC Rating
STC 43
Load Bearing
No
Total Thickness
11"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U290
Assembly Type
Wall
Test Standard
CAN/ULC-S101
Construction Group
Light Frame
Number of Layers
9 layers

Applicable Codes

IBC 2021 Table 722.1IBC 2021 §722

Construction Summary

6" steel studs at 24" o.c., 4 layers of 5/8" Type C gypsum board each side

Material Layers

LayerMaterialThickness
15/8" Type C gypsum board5/8"
25/8" Type C gypsum board5/8"
35/8" Type C gypsum board5/8"
45/8" Type C gypsum board5/8"
56" steel studs at 24" o.c.6.0"
65/8" Type C gypsum board5/8"
75/8" Type C gypsum board5/8"
85/8" Type C gypsum board5/8"
95/8" 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.