Which construction type is associated with heavy timber framing?

Which construction type is associated with heavy timber framing?

• A. Type 4 Construction
• B. Type 1 Construction
• C. Type 2 Construction
• D. Type 3 Construction

Answer: (A)

Heavy timber framing is Type IV construction. This category uses large-dimension wood members—massive timbers—for the structural frame rather than lightweight wood or other materials. The mass of these timbers gives the system intrinsic fire resistance: as they heat, a protective char layer forms on the surface while the inner timber retains strength longer, helping slow fire spread and maintain stability long enough for occupants to evacuate and for firefighters to operate. This contrasts with other types: noncombustible types I and II rely on steel or concrete; mixed exterior walls with interior framing describe Type III; and Type V uses wood framing with smaller members that burn more readily.

Heavy timber framing is Type IV construction. This category uses large-dimension wood members—massive timbers—for the structural frame rather than lightweight wood or other materials. The mass of these timbers gives the system intrinsic fire resistance: as they heat, a protective char layer forms on the surface while the inner timber retains strength longer, helping slow fire spread and maintain stability long enough for occupants to evacuate and for firefighters to operate. This contrasts with other types: noncombustible types I and II rely on steel or concrete; mixed exterior walls with interior framing describe Type III; and Type V uses wood framing with smaller members that burn more readily.