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 U232
UL U2323-hr Fire RatingWallLoad-BearingSTC 55
Steel StudMulti-Layer GypsumFiberglass BattLoad-Bearing WallHigh STCDesign

Steel Stud Wall — 2 layers 5/8" Type X

UL-listed 3-hour fire-rated steel stud wall assembly. 3-5/8" steel studs at 16" o.c. with R-13 fiberglass batt, 2 layers of 5/8" Type X gypsum board each side.

Cross-Section Diagram

1234567.63"WALL ASSEMBLYSECTION · NOT TO SCALE6 LAYERSsee legend for ① ② ③
Legend
15/8" Type X gypsum board(5/8")
25/8" Type X gypsum board(5/8")
33-5/8" steel studs at 16" o.c.(3.625")
4R-13 fiberglass batt
55/8" Type X gypsum board(5/8")
65/8" Type X gypsum board(5/8")

Specifications

Fire Rating
3-Hour
STC Rating
STC 55
Load Bearing
Yes
Total Thickness
6.125"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U232
Assembly Type
Wall
Test Standard
ASTM E119
Construction Group
Light Frame
Number of Layers
6 layers

Applicable Codes

IBC 2021 §722IBC 2024 Table 722.1

Construction Summary

3-5/8" steel studs at 16" o.c. with R-13 fiberglass batt, 2 layers of 5/8" Type X gypsum board each side

Material Layers

LayerMaterialThickness
15/8" Type X gypsum board5/8"
25/8" Type X gypsum board5/8"
33-5/8" steel studs at 16" o.c.3.625"
4R-13 fiberglass batt—
55/8" Type X gypsum board5/8"
65/8" Type X 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.