Which type of building construction is primarily non-combustible?

The type of building construction that is primarily non-combustible is Type II. This classification is defined by building materials that do not contribute to the fire load, meaning that the structural elements, such as walls, floors, and roofs, are constructed from non-combustible materials like concrete, steel, and masonry. This significantly reduces the fire risk compared to structures that use combustible materials, making Type II construction a common choice for commercial buildings and those that prioritize fire safety.

In Type II construction, while some interior finishes may be combustible, the critical structural components are designed to withstand fire exposure without collapsing. This enhances the overall fire resistance of the building, providing more time for occupants to evacuate and for firefighters to manage a blaze.

Other building types, such as Type I and Type III, include different materials or configurations that increase their combustibility. Type I is also non-combustible but is specifically built to withstand greater fire exposure due to its fire-resistive materials and insulation. Type III and Type V construction incorporate more combustible materials, which elevates their fire risk. Therefore, Type II is accurately identified as primarily non-combustible due to its reliance on fire-resistant materials for structural integrity.