In a Type II construction fire scenario, which is a principal hazard?

In a Type II construction fire scenario, which is a principal hazard?

• A. Noncombustible steel components
• B. Water supply
• C. Combustible materials of the roof
• D. Fire escape signage

Answer: (C)

In Type II construction, the frame and major structural elements are noncombustible, so the main risk comes from materials that can fuel the fire rather than the structure itself. The roof is a common hotspot because it can include combustible coverings, decking, insulation, and other fuels. When these roof materials ignite, they feed the fire, accelerate spread through attic spaces or concealed roof voids, and can lead to rapid collapse of the roof assembly. This makes combustible roof materials the principal hazard in this scenario. Noncombustible steel components don’t contribute fuel to the fire, so they’re not the primary danger. A water supply is essential for firefighting, not a hazard, and fire escape signage doesn’t drive fire behavior.

In Type II construction, the frame and major structural elements are noncombustible, so the main risk comes from materials that can fuel the fire rather than the structure itself. The roof is a common hotspot because it can include combustible coverings, decking, insulation, and other fuels. When these roof materials ignite, they feed the fire, accelerate spread through attic spaces or concealed roof voids, and can lead to rapid collapse of the roof assembly. This makes combustible roof materials the principal hazard in this scenario.

Noncombustible steel components don’t contribute fuel to the fire, so they’re not the primary danger. A water supply is essential for firefighting, not a hazard, and fire escape signage doesn’t drive fire behavior.