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Home / Assemblies / GA FC4202
GA FC42021-hr Fire RatingFloor/CeilingLoad-BearingSTC 47
Wood JoistDesign

GA Floor/Ceiling with Gypsum Board — 1-hr

Gypsum Association file FC4202 — 1-hour fire-rated floor-ceiling assembly.

Cross-Section Diagram

1234FLOOR/CEILING ASSEMBLYSECTION · NOT TO SCALE4 LAYERSsee legend for ① ② ③
Legend
1Floor covering(varies)
23/4" OSB subfloor(3/4")
32x12 wood joists at 16" o.c.(9.25"-11.25")
45/8" Type C gypsum board(5/8")

Specifications

Fire Rating
1-Hour
STC Rating
STC 47
Load Bearing
Yes
Total Thickness
10.21"
Source / Publisher
GA (Gypsum Association)
Design Number
FC4202
Assembly Type
Floor/Ceiling
Test Standard
ASTM E119
Construction Group
Light Frame
Number of Layers
4 layers

Applicable Codes

IBC 2021 §722IRC R302.1

Construction Summary

GA file FC4202: Floor/Ceiling with Gypsum Board

Material Layers

LayerMaterialThickness
1Floor coveringvaries
23/4" OSB subfloor3/4"
32x12 wood joists at 16" o.c.9.25"-11.25"
45/8" 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.