What type of building is Noncombustible or Protected Noncombustible?

The correct classification for noncombustible or protected noncombustible buildings is indeed Type II. This type of construction typically consists of noncombustible materials but may include some fire-resistive features. In Type II construction, the structural elements (like walls, floors, and roofs) are made of materials that do not readily ignite or contribute to fire spreading, setting it apart from other types that may allow for combustible materials.

Type II buildings are often used for commercial or industrial purposes, requiring adequate fire protection due to the high occupancy and load factors. This classification emphasizes the use of materials that resist fire, thus enabling a longer evacuation time and greater structural integrity during a fire event.

The other construction types represent varying levels of combustibility and structural design. Type I typically encompasses fire-resistive materials and is used in high-rises, whereas Type III allows for the use of combustible materials in certain structural elements. Type IV, often referred to as heavy timber, involves large timber construction which, while somewhat fire-resistive due to mass, still includes combustible elements. This highlights why Type II is specifically noted for its noncombustible characteristics.