Type IV construction is characterized by which material?

Type IV construction is characterized by which material?

• A. Heavy timber
• B. Reinforced concrete
• C. Steel frame
• D. Poured gypsum

Answer: (A)

Type IV construction is defined by heavy timber framing—the structure relies on large-dimension wooden members for the frame, with floors and roofs also in timber. The substantial wood mass provides inherent fire resistance because thick timber chars slowly and maintains structural integrity longer in a fire. That’s why heavy timber is the material used for this type. The other materials listed aren’t used as the primary structural system in Type IV—reinforced concrete and steel frames belong to other construction types built around noncombustible frames, and poured gypsum is a finishing material, not the main structural element.

Type IV construction is defined by heavy timber framing—the structure relies on large-dimension wooden members for the frame, with floors and roofs also in timber. The substantial wood mass provides inherent fire resistance because thick timber chars slowly and maintains structural integrity longer in a fire. That’s why heavy timber is the material used for this type. The other materials listed aren’t used as the primary structural system in Type IV—reinforced concrete and steel frames belong to other construction types built around noncombustible frames, and poured gypsum is a finishing material, not the main structural element.