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Home / Assemblies / UL U127
UL U1271.5-hr Fire RatingWallLoad-BearingSTC 49
Wood StudGypsum BoardFiberglass BattLoad-Bearing WallDesign

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

UL-listed 1.5-hour fire-rated wood stud wall assembly. 2x4 wood studs at 24" o.c. with R-19 fiberglass batt, single layer of 5/8" Type X gypsum board each side.

Cross-Section Diagram

12346.25"WALL ASSEMBLYSECTION · NOT TO SCALE4 LAYERSsee legend for ① ② ③
Legend
15/8" Type X gypsum board(5/8")
22x4 wood studs at 24" o.c.(3.5")
3R-19 fiberglass batt
45/8" Type X gypsum board(5/8")

Specifications

Fire Rating
1.5-Hour
STC Rating
STC 49
Load Bearing
Yes
Total Thickness
4.75"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
U127
Assembly Type
Wall
Test Standard
CAN/ULC-S101
Construction Group
Light Frame
Number of Layers
4 layers

Applicable Codes

IBC 2024 §722IBC 2021 Table 722.1NFPA 5000

Construction Summary

2x4 wood studs at 24" 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"
22x4 wood studs at 24" o.c.3.5"
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.