Which construction type uses heavy timber framing?

• A. Type II
• B. Type III
• C. Type IV
• D. Type V

Answer: (C)

Heavy timber framing is the hallmark of Type IV construction, often called mill construction. It uses large solid wood members—heavy timbers—for the structural frame, and those timbers are usually exposed. The substantial mass of the wood provides inherent fire resistance and a distinct architectural look, which sets this type apart from the others.

In contrast, Type I and Type II rely on noncombustible materials like concrete and steel; Type III uses noncombustible exterior walls with lighter interior wood framing; and Type V is the standard light wood-frame system. Since heavy timber framing is the defining feature of Type IV, that’s why this construction type is identified as the correct answer.