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 U266
UL U2664-hr Fire RatingWallLoad-BearingSTC 52
Steel StudMulti-Layer GypsumLoad-Bearing WallDesign

Steel Stud Wall — 4 layers 5/8" Type C

UL-listed 4-hour fire-rated steel stud wall assembly. 2-1/2" steel studs at 24" o.c., 4 layers of 5/8" Type C gypsum board each side.

Cross-Section Diagram

1234567897.50"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")
45/8" Type C gypsum board(5/8")
52-1/2" steel studs at 24" o.c.(2.5")
65/8" Type C gypsum board(5/8")
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 52
Load Bearing
Yes
Total Thickness
7.5"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U266
Assembly Type
Wall
Test Standard
UL 263
Construction Group
Light Frame
Number of Layers
9 layers

Applicable Codes

IBC 2024 Table 722.1NFPA 5000IRC R302.1

Construction Summary

2-1/2" steel studs at 24" o.c., 4 layers of 5/8" Type C gypsum board each side

Material Layers

LayerMaterialThickness
15/8" Type C gypsum board5/8"
25/8" Type C gypsum board5/8"
35/8" Type C gypsum board5/8"
45/8" Type C gypsum board5/8"
52-1/2" steel studs at 24" o.c.2.5"
65/8" Type C gypsum board5/8"
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.