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Home / Assemblies / GA FC4204
GA FC42041.5-hr Fire RatingFloor/CeilingLoad-BearingSTC 40
Wood JoistDesign

GA Floor/Ceiling with Gypsum Board — 1.5-hr

Gypsum Association file FC4204 — 1.5-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")
32x10 wood joists at 16" o.c.(9.25"-11.25")
45/8" Type C gypsum board(5/8")

Specifications

Fire Rating
1.5-Hour
STC Rating
STC 40
Load Bearing
Yes
Total Thickness
10.5"
Source / Publisher
GA (Gypsum Association)
Design Number
FC4204
Assembly Type
Floor/Ceiling
Test Standard
ASTM E119
Construction Group
Light Frame
Number of Layers
4 layers

Applicable Codes

IBC 2021 Table 722.1IBC 2024 §722

Construction Summary

GA file FC4204: Floor/Ceiling with Gypsum Board

Material Layers

LayerMaterialThickness
1Floor coveringvaries
23/4" plywood subfloor3/4"
32x10 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.