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Home / Assemblies / UL U264
UL U2644-hr Fire RatingWallSTC 58
Steel StudMulti-Layer GypsumFiberglass BattResilient ChannelPartitionHigh STCDesign

Steel Stud Wall — 3 layers 1/2" Type X on resilient channels

UL-listed 4-hour fire-rated steel stud wall assembly. 2-1/2" steel studs at 24" o.c. with R-19 fiberglass batt, 3 layers of 1/2" Type X gypsum board each side on resilient channels.

Cross-Section Diagram

1234567897.88"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")
4Resilient channels at 24" o.c.(7/8")
52-1/2" steel studs at 24" o.c.(2.5")
6R-19 fiberglass batt
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 58
Load Bearing
No
Total Thickness
6.375"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U264
Assembly Type
Wall
Test Standard
UL 263
Construction Group
Light Frame
Number of Layers
9 layers

Applicable Codes

IBC 2021 Table 722.1IBC 2024 Table 722.1

Construction Summary

2-1/2" steel studs at 24" o.c. with R-19 fiberglass batt, 3 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"
4Resilient channels at 24" o.c.7/8"
52-1/2" steel studs at 24" o.c.2.5"
6R-19 fiberglass batt—
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.