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Home / Assemblies / UL U258
UL U2583-hr Fire RatingWallSTC 53
Steel StudMulti-Layer GypsumFiberglass BattPartitionDesign

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

UL-listed 3-hour fire-rated steel stud wall assembly. 2-1/2" steel studs at 24" o.c. with R-13 fiberglass batt, 2 layers of 1/2" Type X gypsum board each side.

Cross-Section Diagram

1234566.00"WALL ASSEMBLYSECTION · NOT TO SCALE6 LAYERSsee legend for ① ② ③
Legend
11/2" Type X gypsum board(1/2")
21/2" Type X gypsum board(1/2")
32-1/2" steel studs at 24" o.c.(2.5")
4R-13 fiberglass batt
51/2" Type X gypsum board(1/2")
61/2" Type X gypsum board(1/2")

Specifications

Fire Rating
3-Hour
STC Rating
STC 53
Load Bearing
No
Total Thickness
4.5"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U258
Assembly Type
Wall
Test Standard
ASTM E119
Construction Group
Light Frame
Number of Layers
6 layers

Applicable Codes

IBC 2021 §722IBC 2024 §722IRC R302.1

Construction Summary

2-1/2" steel studs at 24" o.c. with R-13 fiberglass batt, 2 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"
32-1/2" steel studs at 24" o.c.2.5"
4R-13 fiberglass batt—
51/2" Type X gypsum board1/2"
61/2" 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.