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Home / Assemblies / UL X101
UL X1011-hr Fire RatingBeamLoad-Bearing
Structural SteelMineral WoolDesign

Steel Beam — Spray-applied mineral fiber

UL-listed 1-hour fire-rated steel beam assembly. W-shape steel beam with Spray-applied mineral fiber, 1-hour fire rating.

Cross-Section Diagram

12BEAM PROTECTIONSECTION · NOT TO SCALE2 LAYERSsee legend for ① ② ③
Legend
1W-shape steel beam(20")
2Spray-applied mineral fiber(0.5")

Specifications

Fire Rating
1-Hour
Load Bearing
Yes
Total Thickness
21"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
X101
Assembly Type
Beam
Test Standard
UL 263
Construction Group
Non-Combustible
Number of Layers
2 layers

Applicable Codes

NFPA 5000IBC 2024 §722

Construction Summary

W-shape steel beam with Spray-applied mineral fiber, 1-hour fire rating

Material Layers

LayerMaterialThickness
1W-shape steel beam20"
2Spray-applied mineral fiber0.5"

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.