What is the primary purpose of firestopping in construction?

The primary purpose of firestopping in construction is to restore the hourly rating of a rated assembly. Firestopping involves the application of materials and systems designed to prevent the spread of fire and smoke through openings and joints in fire-resistive walls, floors, and ceilings. By sealing penetrations, such as those created by electrical conduits, plumbing, and HVAC systems, firestopping maintains the effectiveness of the original fire-rated assemblies, ensuring they perform as intended during a fire. This restoration is critical for the safety of occupants and the integrity of the building, as it helps to contain fires within specific areas, thereby providing additional time for evacuation and emergency response.