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Home / Assemblies / UL N143
UL N1434-hr Fire RatingBeamLoad-Bearing
Design

Concrete Beam — None (concrete cover)

UL-listed 4-hour fire-rated concrete beam assembly. Post-tensioned concrete beam with None (concrete cover), 4-hour fire rating.

Cross-Section Diagram

12BEAM PROTECTIONSECTION · NOT TO SCALE2 LAYERSsee legend for ① ② ③
Legend
1Post-tensioned concrete beam(15")
2None (concrete cover)(3.5")

Specifications

Fire Rating
4-Hour
Load Bearing
Yes
Total Thickness
22"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
N143
Assembly Type
Beam
Test Standard
CAN/ULC-S101
Construction Group
Concrete/Masonry
Number of Layers
2 layers

Applicable Codes

IBC 2024 §722IBC 2021 §722

Construction Summary

Post-tensioned concrete beam with None (concrete cover), 4-hour fire rating

Material Layers

LayerMaterialThickness
1Post-tensioned concrete beam15"
2None (concrete cover)3.5"

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.