In which construction type do masonry exterior walls support the floors and the roof structure?

In Type III construction, commonly known as "ordinary construction," masonry exterior walls indeed serve as the primary support for both the floors and the roof structure. This type of construction features non-combustible exterior walls made from materials such as brick or concrete, which provide critical structural support. These walls not only bear the loads of the floors and roof but also play a significant role in the overall fire resistance of the building.

The key characteristic of Type III construction is that while the exterior walls are typically made of masonry, the interior structural elements, like floors and roofs, can be made of combustible materials. This combination creates a unique fire risk profile, as the interior can be more vulnerable to fire spread once it breaches the exterior walls. Understanding this construction type is essential for firefighting strategies, as it influences how fires may behave and spread within such buildings.