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Home / Assemblies / GA FC4206
GA FC42062-hr Fire RatingFloor/CeilingLoad-BearingSTC 46
Wood JoistDesign

GA Floor/Ceiling with Gypsum Board — 2-hr

Gypsum Association file FC4206 — 2-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" plywood 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
2-Hour
STC Rating
STC 46
Load Bearing
Yes
Total Thickness
13.55"
Source / Publisher
GA (Gypsum Association)
Design Number
FC4206
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 FC4206: Floor/Ceiling with Gypsum Board

Material Layers

LayerMaterialThickness
1Floor coveringvaries
23/4" plywood 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.