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Home / Assemblies / UL J102
UL J1021-hr Fire RatingJoint System
Design

Head-of-Wall Joint — Firestop System

UL-listed 1-hour fire-rated head-of-wall joint system. Head-of-Wall Joint, 1" max width, Firestop pillow system with ceramic fiber backer.

Cross-Section Diagram

12FIRE-RATED JOINTSECTION · NOT TO SCALE2 LAYERSsee legend for ① ② ③
Legend
1Ceramic fiber backer(3")
2Firestop pillow system(1/4")

Specifications

Fire Rating
1-Hour
Load Bearing
No
Total Thickness
Varies
Source / Publisher
UL (Underwriters Laboratories)
Design Number
J102
Assembly Type
Joint System
Test Standard
ASTM E1966
Construction Group
N/A
Number of Layers
2 layers

Applicable Codes

IBC 2021 §714IBC 2021 §715

Construction Summary

Head-of-Wall Joint, 1" max width, Firestop pillow system with ceramic fiber backer

Material Layers

LayerMaterialThickness
1Ceramic fiber backer3"
2Firestop pillow system1/4"

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.