Which construction type is commonly referred to as Ordinary Construction?

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

Answer: (C)

Understanding construction type classifications by fire resistance helps you see why this is called Ordinary Construction. Ordinary Construction refers to buildings with exterior noncombustible walls and interior structural elements that may be wood. This combination is the hallmark of what is officially designated as Type III. It was a very common form of construction in older commercial buildings, which is why the informal name sticks. In contrast, the other types are more fire-resistive or noncombustible throughout (Type I and Type II), or use large timber members for the structural frame (Type IV). So the construction type most commonly referred to as Ordinary Construction is the one that blends noncombustible exterior walls with interior wood framing.