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 U147
UL U1474-hr Fire RatingWallLoad-BearingSTC 53
Wood StudMulti-Layer GypsumMineral WoolLoad-Bearing WallDesign

Wood Stud Wall — 4 layers 5/8" Type C

UL-listed 4-hour fire-rated wood stud wall assembly. 2x4 wood studs at 24" o.c. with R-15 mineral wool batt, 4 layers of 5/8" Type C gypsum board each side.

Cross-Section Diagram

1234567891010.00"WALL ASSEMBLYSECTION · NOT TO SCALE10 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")
52x4 wood studs at 24" o.c.(3.5")
6R-15 mineral wool batt
75/8" Type C gypsum board(5/8")
85/8" Type C gypsum board(5/8")
95/8" Type C gypsum board(5/8")
105/8" Type C gypsum board(5/8")

Specifications

Fire Rating
4-Hour
STC Rating
STC 53
Load Bearing
Yes
Total Thickness
8.5"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U147
Assembly Type
Wall
Test Standard
UL 263
Construction Group
Light Frame
Number of Layers
10 layers

Applicable Codes

IBC 2021 §722IBC 2024 Table 722.1

Construction Summary

2x4 wood studs at 24" o.c. with R-15 mineral wool batt, 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"
52x4 wood studs at 24" o.c.3.5"
6R-15 mineral wool batt—
75/8" Type C gypsum board5/8"
85/8" Type C gypsum board5/8"
95/8" Type C gypsum board5/8"
105/8" 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.