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Home / Assemblies / UL D153
UL D1531.5-hr Fire RatingFloor/CeilingLoad-BearingSTC 53
Steel JoistDesign

Steel Joist Floor/Ceiling — single layer Spray-applied fireproofing

UL-listed 1.5-hour fire-rated steel joist floor/ceiling assembly. Open-web steel joists at 48" o.c., single layer of Spray-applied fireproofing ceiling.

Cross-Section Diagram

1234FLOOR/CEILING ASSEMBLYSECTION · NOT TO SCALE4 LAYERSsee legend for ① ② ③
Legend
1Floor covering(varies)
22" concrete on steel deck(2")
3Open-web steel joists at 48" o.c.(14.0")
4Spray-applied fireproofing(1-1/2")

Specifications

Fire Rating
1.5-Hour
STC Rating
STC 53
Load Bearing
Yes
Total Thickness
17"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
D153
Assembly Type
Floor/Ceiling
Test Standard
UL 263
Construction Group
Non-Combustible
Number of Layers
4 layers

Applicable Codes

IRC R302.1

Construction Summary

Open-web steel joists at 48" o.c., single layer of Spray-applied fireproofing ceiling

Material Layers

LayerMaterialThickness
1Floor coveringvaries
22" concrete on steel deck2"
3Open-web steel joists at 48" o.c.14.0"
4Spray-applied fireproofing1-1/2"

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.