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 U145
UL U1454-hr Fire RatingWallLoad-BearingSTC 50
Wood StudMulti-Layer GypsumLoad-Bearing WallDesign

Wood Stud Wall — 4 layers 5/8" Type X

UL-listed 4-hour fire-rated wood stud wall assembly. 2x4 wood studs at 24" o.c., 4 layers of 5/8" Type X gypsum board each side.

Cross-Section Diagram

1234567898.50"WALL ASSEMBLYSECTION · NOT TO SCALE9 LAYERSsee legend for ① ② ③
Legend
15/8" Type X gypsum board(5/8")
25/8" Type X gypsum board(5/8")
35/8" Type X gypsum board(5/8")
45/8" Type X gypsum board(5/8")
52x4 wood studs at 24" o.c.(3.5")
65/8" Type X gypsum board(5/8")
75/8" Type X gypsum board(5/8")
85/8" Type X gypsum board(5/8")
95/8" Type X gypsum board(5/8")

Specifications

Fire Rating
4-Hour
STC Rating
STC 50
Load Bearing
Yes
Total Thickness
8.5"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U145
Assembly Type
Wall
Test Standard
UL 263
Construction Group
Light Frame
Number of Layers
9 layers

Applicable Codes

IBC 2021 Table 722.1

Construction Summary

2x4 wood studs at 24" o.c., 4 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"
35/8" Type X gypsum board5/8"
45/8" Type X gypsum board5/8"
52x4 wood studs at 24" o.c.3.5"
65/8" Type X gypsum board5/8"
75/8" Type X gypsum board5/8"
85/8" Type X gypsum board5/8"
95/8" 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.