Which type of construction may experience interior wall collapse because the exterior wall and floor are one piece?

The correct answer is Type III construction. This type of construction is characterized by having exterior walls made of non-combustible materials, such as brick or concrete, while the interior components, including walls and floors, are typically constructed with combustible materials like wood.

In Type III structures, the interior and exterior walls can be closely tied together due to the nature of their design—often featuring load-bearing exterior walls that support the floors and roof. During a fire, the combustible interior materials can burn away relatively quickly, leading to a potential scenario where the exterior walls, which are structurally stable, may fail to support the floors above. As the interior walls collapse, this can cause significant risk for fire fighters and occupants inside the building.

This construction type is common in older buildings, such as those used for residential purposes or mixed-use establishments, making it crucial for fire fighters to recognize the risks associated with the potential for interior wall collapse in these structures during fire scenarios.