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 U131
UL U1311.5-hr Fire RatingWallLoad-BearingSTC 65
Wood StudMulti-Layer GypsumMineral WoolResilient ChannelLoad-Bearing WallHigh STCDesign

Wood Stud Wall — 2 layers 1/2" Type X on resilient channels

UL-listed 1.5-hour fire-rated wood stud wall assembly. 2x4 wood studs at 24" o.c. with R-21 mineral wool batt, 2 layers of 1/2" Type X gypsum board each side on resilient channels.

Cross-Section Diagram

12345677.88"WALL ASSEMBLYSECTION · NOT TO SCALE7 LAYERSsee legend for ① ② ③
Legend
11/2" Type X gypsum board(1/2")
21/2" Type X gypsum board(1/2")
3Resilient channels at 24" o.c.(7/8")
42x4 wood studs at 24" o.c.(3.5")
5R-21 mineral wool batt
61/2" Type X gypsum board(1/2")
71/2" Type X gypsum board(1/2")

Specifications

Fire Rating
1.5-Hour
STC Rating
STC 65
Load Bearing
Yes
Total Thickness
6.375"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U131
Assembly Type
Wall
Test Standard
UL 263
Construction Group
Light Frame
Number of Layers
7 layers

Applicable Codes

IBC 2021 §722IBC 2024 §722

Construction Summary

2x4 wood studs at 24" o.c. with R-21 mineral wool batt, 2 layers of 1/2" Type X gypsum board each side on resilient channels

Material Layers

LayerMaterialThickness
11/2" Type X gypsum board1/2"
21/2" Type X gypsum board1/2"
3Resilient channels at 24" o.c.7/8"
42x4 wood studs at 24" o.c.3.5"
5R-21 mineral wool batt—
61/2" Type X gypsum board1/2"
71/2" 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.