What is the primary characteristic of ordinary construction?

In the context of building construction, ordinary construction is primarily characterized by its combination of masonry walls with wooden floors. This type of construction typically utilizes non-combustible materials for the exterior walls, which help to prevent fire spread externally. However, the interior spaces often incorporate wooden elements, such as floors and roof structures, which can be more susceptible to ignition and contribute to the fire load within the building.

The unique aspect of ordinary construction lies in this blend of materials, where the rigidity and fire resistance of masonry provide a stable framework that supports the more combustible wooden components. This combination can influence fire behavior significantly, as the presence of wood can lead to increased fire risk, particularly in the event of an internal ignition source. Understanding the characteristics of ordinary construction is crucial for effectively assessing fire hazards, developing tactical responses during a fire incident, and implementing safety measures during renovation or firefighting efforts. The other options do not accurately describe the characteristic blend found in ordinary construction, thereby reinforcing the focus on masonry and wood.