In ordinary construction, what are the exterior walls made of?

In ordinary construction, the exterior walls are made of noncombustible or limited-combustible materials primarily to enhance fire resistance and structural stability. This construction type aims to provide a balance between durability and safety, ensuring that exterior walls can withstand exposure to fire without collapsing or contributing significantly to fire spread.

Noncombustible materials such as concrete, masonry, or steel are often used for their ability to resist ignition and prevent flames from spreading to the interior of the building. Limited-combustible materials, which may have some degree of combustibility but are treated to reduce fire risks, are also commonly utilized.

This construction approach is crucial for fire containment, protecting occupants, and allowing firefighters a better chance to manage and extinguish a fire effectively. By using a combination of noncombustible and limited-combustible materials, ordinary construction can provide a safer environment compared to structures solely made of combustible materials, which could contribute to rapid fire spread and increased danger.