B
HomeLibrariesCopilotSearchProjectsBookmarks
FeedbackHelp Desk
Libraries
Building Codes
Code LibraryIBC — BuildingIRC — ResidentialIFC — FireIPC — PlumbingIMC — MechanicalIFGC — Fuel GasIECC — EnergyNEC — ElectricalModel Codes
Specifications
CSI SpecificationsDOT SpecsTransit SpecsUSACE
Standards
TransportationRailroadFire SafetyAccessibilityStructural
Tools & References
DiagramsAssembliesProductsCalculatorsChecklistsPermits
PricingLog in
Home / Assemblies / GA SC3218
GA SC32184-hr Fire RatingWallLoad-BearingSTC 53
Multi-Layer GypsumLoad-Bearing WallDesign

GA Solid Core Gypsum Board — 3 layers 5/8" Type C

Gypsum Association file SC3218 — 4-hour fire-rated solid core gypsum board. GA file SC3218: Solid gypsum core, 3 layers of 5/8" Type C gypsum board each side.

Cross-Section Diagram

12345674.75"WALL ASSEMBLYSECTION · NOT TO SCALE7 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")
41" solid gypsum core(1")
55/8" Type C gypsum board(5/8")
65/8" Type C gypsum board(5/8")
75/8" Type C gypsum board(5/8")

Specifications

Fire Rating
4-Hour
STC Rating
STC 53
Load Bearing
Yes
Total Thickness
6.19"
Source / Publisher
GA (Gypsum Association)
Design Number
SC3218
Assembly Type
Wall
Test Standard
ASTM E119
Construction Group
Light Frame
Number of Layers
7 layers

Applicable Codes

IBC 2024 §722IBC 2021 Table 722.1

Construction Summary

GA file SC3218: Solid gypsum core, 3 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"
41" solid gypsum core1"
55/8" Type C gypsum board5/8"
65/8" Type C gypsum board5/8"
75/8" 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.