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 U199
UL U1991.5-hr Fire RatingWallSTC 59
Steel StudGypsum BoardMineral WoolResilient ChannelPartitionHigh STCDesign

Steel Stud Wall — single layer 5/8" Type X on resilient channels

UL-listed 1.5-hour fire-rated steel stud wall assembly. 3-5/8" steel studs at 24" o.c. with R-15 mineral wool batt, single layer of 5/8" Type X gypsum board each side on resilient channels.

Cross-Section Diagram

123457.25"WALL ASSEMBLYSECTION · NOT TO SCALE5 LAYERSsee legend for ① ② ③
Legend
15/8" Type X gypsum board(5/8")
2Resilient channels at 24" o.c.(7/8")
33-5/8" steel studs at 24" o.c.(3.625")
4R-15 mineral wool batt
55/8" Type X gypsum board(5/8")

Specifications

Fire Rating
1.5-Hour
STC Rating
STC 59
Load Bearing
No
Total Thickness
5.75"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U199
Assembly Type
Wall
Test Standard
ASTM E119
Construction Group
Light Frame
Number of Layers
5 layers

Applicable Codes

IBC 2021 §722IBC 2024 Table 722.1

Construction Summary

3-5/8" steel studs at 24" o.c. with R-15 mineral wool batt, single layer of 5/8" Type X gypsum board each side on resilient channels

Material Layers

LayerMaterialThickness
15/8" Type X gypsum board5/8"
2Resilient channels at 24" o.c.7/8"
33-5/8" steel studs at 24" o.c.3.625"
4R-15 mineral wool batt—
55/8" 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.