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Home / Assemblies / UL U317
UL U3171-hr Fire RatingWallSTC 45
Steel StudGypsum BoardMineral WoolPartitionDesign

Shaft Wall — single layer 1" Type C

UL-listed 1-hour fire-rated shaft wall assembly. 2-1/2" CT studs at 24" o.c. with R-8 mineral wool, single layer of 1" Shaftliner gypsum board each side.

Cross-Section Diagram

12346.00"WALL ASSEMBLYSECTION · NOT TO SCALE4 LAYERSsee legend for ① ② ③
Legend
11" Shaftliner gypsum board(1")
22-1/2" CT studs at 24" o.c.(2.5")
3R-8 mineral wool
41" Shaftliner gypsum board(1")

Specifications

Fire Rating
1-Hour
STC Rating
STC 45
Load Bearing
No
Total Thickness
4.5"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U317
Assembly Type
Wall
Test Standard
CAN/ULC-S101
Construction Group
Concrete/Masonry
Number of Layers
4 layers

Applicable Codes

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

Construction Summary

2-1/2" CT studs at 24" o.c. with R-8 mineral wool, single layer of 1" Shaftliner gypsum board each side

Material Layers

LayerMaterialThickness
11" Shaftliner gypsum board1"
22-1/2" CT studs at 24" o.c.2.5"
3R-8 mineral wool—
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.