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Home / Assemblies / UL U172
UL U1721-hr Fire RatingWallLoad-BearingSTC 40
Wood StudGypsum BoardMineral WoolLoad-Bearing WallDesign

Wood Stud Wall — single layer 5/8" Type X

UL-listed 1-hour fire-rated wood stud wall assembly. 2x6 wood studs at 24" o.c. with R-15 mineral wool batt, single layer of 5/8" Type X gypsum board each side.

Cross-Section Diagram

12348.25"WALL ASSEMBLYSECTION · NOT TO SCALE4 LAYERSsee legend for ① ② ③
Legend
15/8" Type X gypsum board(5/8")
22x6 wood studs at 24" o.c.(5.5")
3R-15 mineral wool batt
45/8" Type X gypsum board(5/8")

Specifications

Fire Rating
1-Hour
STC Rating
STC 40
Load Bearing
Yes
Total Thickness
6.75"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U172
Assembly Type
Wall
Test Standard
ASTM E119
Construction Group
Light Frame
Number of Layers
4 layers

Applicable Codes

IBC 2024 §722IBC 2021 Table 722.1

Construction Summary

2x6 wood studs at 24" o.c. with R-15 mineral wool batt, single layer of 5/8" Type X gypsum board each side

Material Layers

LayerMaterialThickness
15/8" Type X gypsum board5/8"
22x6 wood studs at 24" o.c.5.5"
3R-15 mineral wool batt—
45/8" 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.