What is the process of restoring an hourly fire endurance rating to a fire barrier called?

The process of restoring an hourly fire endurance rating to a fire barrier is specifically referred to as firestopping. Firestopping involves the application of materials or systems that seal joints and openings in fire-resistance-rated wall and floor assemblies. The main goal is to maintain the integrity of the fire barrier by ensuring that any penetrations, such as those made for pipes, cables, or ducts, do not compromise the barrier's ability to resist the passage of fire and smoke for a specified duration.

Firestopping materials are designed to withstand high temperatures and prevent the spread of fire and smoke, thereby preserving the barrier’s fire rating. This process is crucial for life safety, property protection, and compliance with building codes, as it ensures that the fire barrier can perform its intended function during a fire event.

The other terms, although related to fire protection, do not specifically address the process of restoring fire endurance ratings. Fireproofing generally refers to the application of materials to make structures resistant to fire, while fire retarding pertains more to materials that slow down fire spread rather than restoring ratings. Firewalling refers to the construction of fire-rated barriers but does not specifically cover the restoration aspect.