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Home / Assemblies / UL N149
UL N1492-hr Fire RatingColumnLoad-Bearing
Design

Concrete Column — None (concrete cover)

UL-listed 2-hour fire-rated concrete column assembly. Cast-in-place concrete column with None (concrete cover), 2-hour fire rating.

Cross-Section Diagram

12COLUMN PROTECTIONSECTION · NOT TO SCALE2 LAYERSsee legend for ① ② ③
Legend
1Cast-in-place concrete column(18")
2None (concrete cover)(2.5")

Specifications

Fire Rating
2-Hour
Load Bearing
Yes
Total Thickness
23"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
N149
Assembly Type
Column
Test Standard
ASTM E119
Construction Group
Concrete/Masonry
Number of Layers
2 layers

Applicable Codes

IBC 2024 §722IBC 2021 §722

Construction Summary

Cast-in-place concrete column with None (concrete cover), 2-hour fire rating

Material Layers

LayerMaterialThickness
1Cast-in-place concrete column18"
2None (concrete cover)2.5"

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.