B
HomeLibrariesCopilotSearchProjectsBookmarks
FeedbackHelp Desk
Libraries
Building Codes
Code LibraryIBC — BuildingIRC — ResidentialIFC — FireIPC — PlumbingIMC — MechanicalIFGC — Fuel GasIECC — EnergyNEC — ElectricalModel Codes
Specifications
CSI SpecificationsDOT SpecsTransit SpecsUSACE
Standards
TransportationRailroadFire SafetyAccessibilityStructural
Tools & References
DiagramsAssembliesProductsCalculatorsChecklistsPermits
PricingLog in
Home / Assemblies / UL U225
UL U2251.5-hr Fire RatingWallSTC 48
Steel StudGypsum BoardMineral WoolPartitionDesign

Steel Stud Wall — single layer 1/2" Type X

UL-listed 1.5-hour fire-rated steel stud wall assembly. 3-5/8" steel studs at 16" o.c. with R-15 mineral wool batt, single layer of 1/2" Type X gypsum board each side.

Cross-Section Diagram

12346.13"WALL ASSEMBLYSECTION · NOT TO SCALE4 LAYERSsee legend for ① ② ③
Legend
11/2" Type X gypsum board(1/2")
23-5/8" steel studs at 16" o.c.(3.625")
3R-15 mineral wool batt
41/2" Type X gypsum board(1/2")

Specifications

Fire Rating
1.5-Hour
STC Rating
STC 48
Load Bearing
No
Total Thickness
4.625"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U225
Assembly Type
Wall
Test Standard
UL 263
Construction Group
Light Frame
Number of Layers
4 layers

Applicable Codes

IBC 2021 Table 722.1

Construction Summary

3-5/8" steel studs at 16" o.c. with R-15 mineral wool batt, single layer of 1/2" Type X gypsum board each side

Material Layers

LayerMaterialThickness
11/2" Type X gypsum board1/2"
23-5/8" steel studs at 16" o.c.3.625"
3R-15 mineral wool batt—
41/2" 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.