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Home / Assemblies / UL U239
UL U2394-hr Fire RatingWallLoad-BearingSTC 63
Steel StudMulti-Layer GypsumFiberglass BattResilient ChannelLoad-Bearing WallHigh STCDesign

Steel Stud Wall — 3 layers 5/8" Type C on resilient channels

UL-listed 4-hour fire-rated steel stud wall assembly. 3-5/8" steel studs at 16" o.c. with R-11 fiberglass batt, 3 layers of 5/8" Type C gypsum board each side on resilient channels.

Cross-Section Diagram

1234567899.75"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")
4Resilient channels at 24" o.c.(7/8")
53-5/8" steel studs at 16" o.c.(3.625")
6R-11 fiberglass batt
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 63
Load Bearing
Yes
Total Thickness
8.25"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U239
Assembly Type
Wall
Test Standard
ASTM E119
Construction Group
Light Frame
Number of Layers
9 layers

Applicable Codes

IRC R302.1IBC 2024 Table 722.1

Construction Summary

3-5/8" steel studs at 16" o.c. with R-11 fiberglass batt, 3 layers of 5/8" Type C gypsum board each side on resilient channels

Material Layers

LayerMaterialThickness
15/8" Type C gypsum board5/8"
25/8" Type C gypsum board5/8"
35/8" Type C gypsum board5/8"
4Resilient channels at 24" o.c.7/8"
53-5/8" steel studs at 16" o.c.3.625"
6R-11 fiberglass batt—
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.