What is the primary purpose of fire stopping in fire-rated assemblies?

• A. Improve acoustics
• B. Seal penetrations to maintain fire rating
• C. Increase energy efficiency
• D. Provide maintenance access

Answer: (B)

Fire stopping is about preserving the fire-resistance of a wall, floor, or ceiling by sealing openings where penetrations occur. When pipes, cables, or ducts pass through a fire-rated assembly, gaps become paths for flames, smoke, and hot gases; fire-stopping materials fill and seal these gaps so the rated barrier remains effective for its specified duration. Some materials expand or harden under heat to restore the enclosure’s integrity. Although proper fire stopping can influence acoustics or energy performance, its primary purpose is to contain fire and smoke to protect lives and limit damage.