What is the purpose of compartmentation in buildings?

• A. To slow fire growth across the building
• B. To slow smoke spread within the building
• C. To maximize open floor area
• D. To slow fire and smoke spread and protect occupants

Answer: (D)

Compartmentation uses fire-resistance rated barriers to divide a building into sections that can resist heat and flame for a period of time. The purpose is to slow both the fire’s growth and the movement of smoke so occupants have a safe window to escape and responders have a better chance to intervene. By containing heat and smoke to a defined area, compartments protect exit routes, reduce damage to other parts of the structure, and help maintain tenable conditions for people inside. That combination—slowing fire and smoke spread while safeguarding occupants—is why this option is the best choice. The other ideas miss either the smoke aspect, the occupant protection, or actually contradict compartmentation by promoting open, unprotected space.