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Home / Assemblies / UL U148
UL U1481-hr Fire RatingWallLoad-BearingSTC 45
Wood StudGypsum BoardFiberglass BattLoad-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 16" o.c. with R-19 fiberglass 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 16" o.c.(5.5")
3R-19 fiberglass batt
45/8" Type X gypsum board(5/8")

Specifications

Fire Rating
1-Hour
STC Rating
STC 45
Load Bearing
Yes
Total Thickness
6.75"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U148
Assembly Type
Wall
Test Standard
CAN/ULC-S101
Construction Group
Light Frame
Number of Layers
4 layers

Applicable Codes

NFPA 5000IBC 2024 §722IBC 2021 §722

Construction Summary

2x6 wood studs at 16" o.c. with R-19 fiberglass 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 16" o.c.5.5"
3R-19 fiberglass 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.