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Home / Assemblies / GA WP1200
GA WP12001-hr Fire RatingWallLoad-BearingSTC 40
Wood StudGypsum BoardLoad-Bearing WallDesign

GA Wood Stud Partition — 1 layer 5/8" Type C

Gypsum Association file WP1200 — 1-hour fire-rated wood stud partition. GA file WP1200: 2x4 wood studs at 16" o.c., 1 layer of 5/8" Type C gypsum board each side.

Cross-Section Diagram

1232.75"WALL ASSEMBLYSECTION · NOT TO SCALE3 LAYERSsee legend for ① ② ③
Legend
15/8" Type C gypsum board(5/8")
22x4 wood studs at 16" o.c.
35/8" Type C gypsum board(5/8")

Specifications

Fire Rating
1-Hour
STC Rating
STC 40
Load Bearing
Yes
Total Thickness
5.74"
Source / Publisher
GA (Gypsum Association)
Design Number
WP1200
Assembly Type
Wall
Test Standard
ASTM E119
Construction Group
Light Frame
Number of Layers
3 layers

Applicable Codes

IBC 2021 Table 722.1IBC 2024 Table 722.1

Construction Summary

GA file WP1200: 2x4 wood studs at 16" o.c., 1 layer of 5/8" Type C gypsum board each side

Material Layers

LayerMaterialThickness
15/8" Type C gypsum board5/8"
22x4 wood studs at 16" o.c.—
35/8" Type C gypsum board5/8"

Important Notice

This assembly listing is for reference only. Always verify against the current GA Fire Resistance Design Manual database before specifying in construction documents. Material substitutions may void the fire rating. Consult with a qualified fire protection engineer for project-specific requirements.