Which types of construction typically use noncombustible materials for building elements?

Type I and Type II construction types are specifically designed to utilize noncombustible materials for their building elements. These types of construction are often found in high-rise buildings and structures that require increased fire resistance.

Type I construction usually involves the use of steel and concrete, which do not ignite or contribute to the spread of fire, providing an effective barrier in the event of a fire. This classification is often used for taller buildings, where fire protection and building stability are critical.

Type II construction also utilizes noncombustible materials but is generally allowed more flexibility in the types of materials used compared to Type I. Commonly seen in smaller commercial buildings, it still requires a significant amount of noncombustible elements to enhance fire safety.

In contrast, Type III construction incorporates both combustible and noncombustible materials, while Type IV construction (known as heavy timber) primarily uses wood but in a way that can provide some fire-resistive properties. Type V construction allows for the most combustible materials, typically wood framing, which is least fire-resistant. This distinction in material usage is crucial for understanding building codes and safety regulations related to fire risks in construction.