Which construction type uses heavy timber interior framing with minimum dimensions larger than those used in Type 3?

• A. Type 2
• B. Type 4
• C. Type 5
• D. Type 3

Answer: (B)

Heavy timber construction uses large-dimension timber for interior framing. This type is defined by interior framing members that are larger than those allowed in Type III, giving greater fire resistance due to the mass and thick sections of the timber. The other construction types either use noncombustible materials (Types I and II) or light-frame wood (Type V), so they don’t match the description. Thus, the construction type described is Type IV.