Which construction type has noncombustible exterior walls with interior framing that may be wood or other combustible?

• A. Type I (Fire-Resistive)
• B. Type III (Ordinary)
• C. Type II (Noncombustible Exterior Walls)
• D. Type IV (Heavy Timber)

Answer: (B)

Understanding how construction types are defined by fire resistance and materials helps you see why this fits. In the ordinary construction type, the exterior walls are noncombustible to resist flame exposure from outside and slow fire spread through the wall, while the interior framing can be wood or other combustible materials. This combination keeps construction costs lower while providing a practical level of fire performance: a sturdy, noncombustible outer shell with interior framing that can burn if exposed to fire. It differs from types where interior framing is also noncombustible, or where the whole structure is designed to resist fire for a specific period, or from heavy timber where the interior framing is large timber members.