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Home / Assemblies / UL C127
UL C1272-hr Fire RatingJoint System
Mineral WoolDesign

Through-Penetration Firestop — Intumescent System

UL-listed 2-hour fire-rated through-penetration firestop system. Through-Penetration Firestop, 3/4" max width, Intumescent wrap strip with mineral wool backer.

Cross-Section Diagram

12FIRE-RATED JOINTSECTION · NOT TO SCALE2 LAYERSsee legend for ① ② ③
Legend
1Mineral wool backer(1")
2Intumescent wrap strip(5/8")

Specifications

Fire Rating
2-Hour
Load Bearing
No
Total Thickness
Varies
Source / Publisher
UL (Underwriters Laboratories)
Design Number
C127
Assembly Type
Joint System
Test Standard
ASTM E814
Construction Group
N/A
Number of Layers
2 layers

Applicable Codes

IBC 2021 §715IBC 2021 §714

Construction Summary

Through-Penetration Firestop, 3/4" max width, Intumescent wrap strip with mineral wool backer

Material Layers

LayerMaterialThickness
1Mineral wool backer1"
2Intumescent wrap strip5/8"

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.