What type of building is classified as Noncombustible or Protected Noncombustible?

The classification of buildings as Noncombustible or Protected Noncombustible refers specifically to the construction types recognized within the building codes that define how resistive a structure is to fire.

Type II construction is characterized by noncombustible materials, meaning that the structural elements—such as walls, floors, and roofs—are made from materials that do not ignite and burn like metals, concrete, or masonry. This type of construction offers a higher level of fire resistance compared to the other classifications. Additionally, the term "Protected Noncombustible" indicates that while the materials may not combust, there are also fire protection features integrated into the building design, such as fire-rated assemblies, which enhance the overall safety and integrity of the structure in the event of a fire.

In contrast, Type I is classified as a fire-resistive construction, which is even more stringent than Type II in terms of fire resistance duration. Type III and Type IV constructions incorporate combustible elements, making them less fire-resistant than Type II and Type I. Thus, Type II serves the specific definition of noncombustibility and protection in a fire scenario.