Which construction type features exterior and interior walls of approved non-combustible or limited combustible materials and wood interior members?

Which construction type features exterior and interior walls of approved non-combustible or limited combustible materials and wood interior members?

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

Answer: (B)

Heavy timber construction is defined by exterior and interior walls that are noncombustible or limited combustible, while the interior structural frame uses wood in large-dimension timbers. This combination provides higher fire resistance than typical wood framing because the heavy timber members burn more slowly and maintain structural integrity longer, while the noncombustible walls help contain and compartmentalize the fire. The described arrangement fits this construction type, where wood interior members form the main structural frame but the walls themselves are noncombustible or limited combustible.

Heavy timber construction is defined by exterior and interior walls that are noncombustible or limited combustible, while the interior structural frame uses wood in large-dimension timbers. This combination provides higher fire resistance than typical wood framing because the heavy timber members burn more slowly and maintain structural integrity longer, while the noncombustible walls help contain and compartmentalize the fire. The described arrangement fits this construction type, where wood interior members form the main structural frame but the walls themselves are noncombustible or limited combustible.