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 / UL N123
UL N1232-hr Fire RatingBeamLoad-Bearing
ConcreteDesign

Concrete Beam — Gypsum board enclosure

UL-listed 2-hour fire-rated concrete beam assembly. Precast concrete beam with Gypsum board enclosure, 2-hour fire rating.

Cross-Section Diagram

12BEAM PROTECTIONSECTION · NOT TO SCALE2 LAYERSsee legend for ① ② ③
Legend
1Precast concrete beam(22")
2Gypsum board enclosure(0.94")

Specifications

Fire Rating
2-Hour
Load Bearing
Yes
Total Thickness
23.88"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
N123
Assembly Type
Beam
Test Standard
ASTM E119
Construction Group
Concrete/Masonry
Number of Layers
2 layers

Applicable Codes

NFPA 5000IBC 2021 §722

Construction Summary

Precast concrete beam with Gypsum board enclosure, 2-hour fire rating

Material Layers

LayerMaterialThickness
1Precast concrete beam22"
2Gypsum board enclosure0.94"

Important Notice

This assembly listing is for reference only. Always verify against the current UL Product iQ database before specifying in construction documents. Material substitutions may void the fire rating. Consult with a qualified fire protection engineer for project-specific requirements.