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 U333
UL U3331-hr Fire RatingWallSTC 44
Steel StudGypsum BoardFiberglass BattPartitionDesign

Shaft Wall — single layer 1" Type C

UL-listed 1-hour fire-rated shaft wall assembly. 3-5/8" CT studs at 24" o.c. with R-11 fiberglass batt, single layer of 1" Shaftliner gypsum board each side.

Cross-Section Diagram

12347.13"WALL ASSEMBLYSECTION · NOT TO SCALE4 LAYERSsee legend for ① ② ③
Legend
11" Shaftliner gypsum board(1")
23-5/8" CT studs at 24" o.c.(3.625")
3R-11 fiberglass batt
41" Shaftliner gypsum board(1")

Specifications

Fire Rating
1-Hour
STC Rating
STC 44
Load Bearing
No
Total Thickness
5.625"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U333
Assembly Type
Wall
Test Standard
CAN/ULC-S101
Construction Group
Concrete/Masonry
Number of Layers
4 layers

Applicable Codes

IBC 2021 Table 722.1IBC 2024 Table 722.1IBC 2024 §722

Construction Summary

3-5/8" CT studs at 24" o.c. with R-11 fiberglass batt, single layer of 1" Shaftliner gypsum board each side

Material Layers

LayerMaterialThickness
11" Shaftliner gypsum board1"
23-5/8" CT studs at 24" o.c.3.625"
3R-11 fiberglass batt—
41" Shaftliner gypsum board1"

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.