What are the two main types of construction classifications recognized in the IBC?

The primary construction classifications recognized in the International Building Code (IBC) include Type I, Type II, Type III, Type IV, and Type V. Type I refers to fire-resistive construction, which is designed to withstand fire for an extended period, and it typically uses non-combustible materials such as concrete and steel. Type V, on the other hand, is classified as wood-frame construction, which utilizes timber in its structural framework and has the least amount of fire-resistance compared to other types.

The identification of Type I as fire-resistive and Type V as wood frame reflects the fundamental differences in construction methods and materials used, which heavily influence building safety, fire resistance, and overall structural integrity. This knowledge is crucial for inspectors to ensure buildings comply with safety standards and regulations dictated by the IBC, as these construction types have varying requirements regarding fire protection, occupancy limits, and structural durability.

The other options present different combinations of construction types, but they do not capture the two main classifications as recognized in the IBC effectively. For instance, Type II is also classified as non-combustible, and while Type IV focuses on heavy timber, it does not address the fundamental fire-resistive aspect associated with Type I.