Which type of construction has exterior weight-bearing walls and a 1-hour fire resistance rating?

• A. Ordinary construction
• B. Wood frame
• C. Metal building
• D. Light-gauge steel

Answer: (A)

The main idea is that construction types are defined by how the building carries loads and by the fire-resistance of key elements. Exterior weight-bearing walls mean the walls themselves carry the structural load, and in ordinary construction those exterior walls are built of noncombustible materials and are designed to provide a defined fire resistance—often a 1-hour rating—helping to limit fire spread and maintain stability while the fire is fought. This combination distinguishes ordinary construction from wood-frame or steel-frame/metal buildings, where the exterior walls are not load-bearing masonry walls with a guaranteed 1-hour rating by default.