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Home / Assemblies / GA SP2218
GA SP22184-hr Fire RatingWallSTC 45
Wood StudMulti-Layer GypsumPartitionDesign

GA Steel Stud Partition — 4 layers 5/8" Type C

Gypsum Association file SP2218 — 4-hour fire-rated steel stud partition. GA file SP2218: 2x4 wood studs at 16" o.c., 4 layers of 5/8" Type C gypsum board each side.

Cross-Section Diagram

1234567896.50"WALL ASSEMBLYSECTION · NOT TO SCALE9 LAYERSsee legend for ① ② ③
Legend
15/8" Type C gypsum board(5/8")
25/8" Type C gypsum board(5/8")
35/8" Type C gypsum board(5/8")
45/8" Type C gypsum board(5/8")
52x4 wood studs at 16" o.c.
65/8" Type C gypsum board(5/8")
75/8" Type C gypsum board(5/8")
85/8" Type C gypsum board(5/8")
95/8" Type C gypsum board(5/8")

Specifications

Fire Rating
4-Hour
STC Rating
STC 45
Load Bearing
No
Total Thickness
6.4"
Source / Publisher
GA (Gypsum Association)
Design Number
SP2218
Assembly Type
Wall
Test Standard
ASTM E119
Construction Group
Light Frame
Number of Layers
9 layers

Applicable Codes

IBC 2024 Table 722.1IBC 2024 §722

Construction Summary

GA file SP2218: 2x4 wood studs at 16" o.c., 4 layers of 5/8" Type C gypsum board each side

Material Layers

LayerMaterialThickness
15/8" Type C gypsum board5/8"
25/8" Type C gypsum board5/8"
35/8" Type C gypsum board5/8"
45/8" Type C gypsum board5/8"
52x4 wood studs at 16" o.c.—
65/8" Type C gypsum board5/8"
75/8" Type C gypsum board5/8"
85/8" Type C gypsum board5/8"
95/8" 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.