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Home / Assemblies / UL X274
UL X2743-hr Fire RatingColumnLoad-Bearing
Structural SteelDesign

Steel Column — Spray-applied cementitious fireproofing

UL-listed 3-hour fire-rated steel column assembly. HSS round steel column with Spray-applied cementitious fireproofing, 3-hour fire rating.

Cross-Section Diagram

12COLUMN PROTECTIONSECTION · NOT TO SCALE2 LAYERSsee legend for ① ② ③
Legend
1HSS round steel column(8")
2Spray-applied cementitious fireproofing(1.86")

Specifications

Fire Rating
3-Hour
Load Bearing
Yes
Total Thickness
11.72"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
X274
Assembly Type
Column
Test Standard
CAN/ULC-S101
Construction Group
Non-Combustible
Number of Layers
2 layers

Applicable Codes

IBC 2024 §722IBC 2021 §722

Construction Summary

HSS round steel column with Spray-applied cementitious fireproofing, 3-hour fire rating

Material Layers

LayerMaterialThickness
1HSS round steel column8"
2Spray-applied cementitious fireproofing1.86"

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.