UL system

Firestopping: The Detail Work That Keeps Fires from Spreading Through Penetrations

Firestopping — filling penetrations through fire-rated assemblies with tested materials — is code-required and life safety critical. Every pipe, conduit, cable, and duct penetrating a fire-rated wall or floor requires firestop that restores the assembly's rating. The work is detailed, specific to each penetration configuration, and often poorly executed. Understanding firestopping helps GCs deliver compliant life safety rather than discovering issues at inspection.