What feature of a building construction type makes Type III vulnerable under fire conditions?

Type III construction is primarily characterized by its use of both combustible and non-combustible materials, where the exterior walls are typically non-combustible, but the interior structural elements, such as walls, floors, and roofs, are made of wood. One significant vulnerability of Type III construction under fire conditions is the presence of wooden frames.

The wooden frames provide an easy pathway for fire to spread, especially if there are any void spaces or concealed areas where flames can travel undetected. Furthermore, the combination of wooden interior elements and potential gaps within the structure means that once a fire ignites, it can spread rapidly through the wooden components.

This construction type is particularly susceptible to rapid fire growth and spread due to its inherent material vulnerabilities, as opposed to a feature like one-piece exterior and interior walls, which may potentially limit the spread of fire to certain areas. The wooden components combined with the design of Type III buildings necessitate a keen understanding and strategic approach to fire suppression and prevention measures by firefighters.