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Home / Assemblies / UL X145
UL X1454-hr Fire RatingBeamLoad-Bearing
Structural SteelDesign

Steel Beam — Concrete encasement

UL-listed 4-hour fire-rated steel beam assembly. HSS steel beam with Concrete encasement, 4-hour fire rating.

Cross-Section Diagram

12BEAM PROTECTIONSECTION · NOT TO SCALE2 LAYERSsee legend for ① ② ③
Legend
1HSS steel beam(12")
2Concrete encasement(3.5")

Specifications

Fire Rating
4-Hour
Load Bearing
Yes
Total Thickness
19"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
X145
Assembly Type
Beam
Test Standard
CAN/ULC-S101
Construction Group
Non-Combustible
Number of Layers
2 layers

Applicable Codes

NFPA 5000IBC 2021 §722

Construction Summary

HSS steel beam with Concrete encasement, 4-hour fire rating

Material Layers

LayerMaterialThickness
1HSS steel beam12"
2Concrete encasement3.5"

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.