What is the primary fire hazard in Type III construction buildings?

• A. Masonry exterior walls
• B. Combustible interior components and contents
• C. Concealed spaces
• D. Fire protection systems

Answer: (B)

In Type III construction the exterior walls are noncombustible, but the interior typically uses wood framing and contains a lot of combustible contents and interior finishes. That interior fuel load is the main fire hazard because, once a fire starts inside, these fuels feed the flames, drive rapid heat and smoke production, and promote quick spread through rooms and concealed spaces. Exterior masonry walls help resist flame from the outside and fire protection systems mitigate the spread, but they don’t supply the same level of fuel that interior components and contents do. So the primary hazard comes from the interior combustibles and contents.