In what way does Type II construction differ from Type I construction?

Type II construction is distinguished from Type I construction primarily in terms of the materials and methods used. Type I construction is characterized by non-combustible materials, typically including reinforced concrete and steel, providing a high level of fire resistance. In contrast, Type II construction often consists of non-combustible walls and roofs but may include more combustible materials, particularly in the interior finishes and framing elements.

The correct choice indicates that Type II lacks insulation or other protective measures compared to Type I. This is significant because the absence of insulation can lead to increased thermal transfer during a fire, potentially allowing fires to spread more easily within the structure. While Type II may still consist of certain non-combustible materials, it does not achieve the same level of fire resistance due to design choices that do not incorporate extensive protective measures.

This distinction highlights the overall fire safety features associated with each construction type, illustrating why Type II buildings may pose different risks than those constructed with the more protective design of Type I.