Structural members are unprotected non-combustible or limited combustible materials. Which construction type is this describing?

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

Answer: (B)

This describes Type II construction. In this type, the building uses noncombustible materials for the structural frame, and those structural members are allowed to be unprotected or have only limited fire-resistive protection. This contrasts with Type I, where structural members must be heavily protected with fire resistance, and with the other types where exterior or interior materials and framing differ (for example, Type III with noncombustible exterior walls but potentially combustible interior elements, Type IV heavy timber, and Type V all-wood framing). So the best match for unprotected noncombustible or limited combustible structural members is Type II construction.