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 U328
UL U3283-hr Fire RatingWallSTC 59
Steel StudMulti-Layer GypsumMineral WoolPartitionHigh STCDesign

Shaft Wall — 3 layers 5/8" Type X

UL-listed 3-hour fire-rated shaft wall assembly. 2-1/2" CT studs at 24" o.c. with R-8 mineral wool, 3 layers of 5/8" Type X gypsum board each side.

Cross-Section Diagram

123456787.75"WALL ASSEMBLYSECTION · NOT TO SCALE8 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")
42-1/2" CT studs at 24" o.c.(2.5")
5R-8 mineral wool
65/8" Type X gypsum board(5/8")
75/8" Type X gypsum board(5/8")
85/8" Type X gypsum board(5/8")

Specifications

Fire Rating
3-Hour
STC Rating
STC 59
Load Bearing
No
Total Thickness
6.25"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U328
Assembly Type
Wall
Test Standard
CAN/ULC-S101
Construction Group
Concrete/Masonry
Number of Layers
8 layers

Applicable Codes

IBC 2021 Table 722.1

Construction Summary

2-1/2" CT studs at 24" o.c. with R-8 mineral wool, 3 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"
42-1/2" CT studs at 24" o.c.2.5"
5R-8 mineral wool—
65/8" Type X gypsum board5/8"
75/8" Type X gypsum board5/8"
85/8" 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.