What is the purpose of fire stopping in construction?

• A. To improve acoustics and sound isolation.
• B. To seal openings in fire-rated assemblies to prevent flame, smoke, and hot gases from passing between spaces.
• C. To enhance lighting and electrical wiring performance.
• D. To decorate walls and ceilings with fire-resistant paint.

Answer: (B)

Fire stopping focuses on sealing openings in fire-rated walls, floors, and ceilings so a fire cannot easily move from one area to another. The goal is to maintain the integrity of the fire barrier, slowing the spread of flames, smoke, and hot gases and giving occupants more time to evacuate while helping responders control the fire. This means filling gaps around penetrations for pipes, cables, and ducts with approved materials that expand or harden under heat to keep the barrier intact and continuous with the rated fire resistance of the assembly. While some firestop products might incidentally affect acoustics or other finishes, the primary purpose is to preserve compartmentation, not improve sound, electrical performance, or decoration.