In which type of construction must all structural components be made of noncombustible materials?

Type I construction refers to a building design where all structural components, including walls, floors, and roofs, are made from noncombustible materials. This type of construction is designed to withstand a high level of fire exposure and to provide a greater degree of fire resistance. The materials typically used in Type I construction include reinforced concrete and steel, which do not ignite or burn when exposed to heat.

The significance of using noncombustible materials is to enhance the safety of the structure during a fire, ensuring that it remains structurally sound for a longer period and provides ample time for evacuation and firefighting efforts. This requirement is crucial in protecting both the occupants and emergency responders by minimizing the risk of structural collapse during firefighting operations.

In contrast, other types of construction, like Type II, Type III, and Type IV, incorporate combustible materials to varying degrees, which can affect their fire resistance and structural integrity in the event of a fire.