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Home / Assemblies / UL C133
UL C1334-hr Fire RatingJoint System
Mineral WoolDesign

Through-Penetration Firestop — Cementitious System

UL-listed 4-hour fire-rated through-penetration firestop system. Through-Penetration Firestop, 1" max width, Cementitious mortar fill with mineral wool backer.

Cross-Section Diagram

12FIRE-RATED JOINTSECTION · NOT TO SCALE2 LAYERSsee legend for ① ② ③
Legend
1Mineral wool backer(3")
2Cementitious mortar fill(1/2")

Specifications

Fire Rating
4-Hour
Load Bearing
No
Total Thickness
Varies
Source / Publisher
UL (Underwriters Laboratories)
Design Number
C133
Assembly Type
Joint System
Test Standard
CAN/ULC-S115
Construction Group
N/A
Number of Layers
2 layers

Applicable Codes

NFPA 5000IBC 2021 §715

Construction Summary

Through-Penetration Firestop, 1" max width, Cementitious mortar fill with mineral wool backer

Material Layers

LayerMaterialThickness
1Mineral wool backer3"
2Cementitious mortar fill1/2"

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.