What is a key feature of Type I construction classifications?

Type I construction classifications are characterized by the use of non-combustible materials. This means that the structural components and elements of buildings classified under Type I are made from materials that do not burn, such as concrete and steel. This aspect is crucial for ensuring that a building can withstand fire better than those constructed from combustible materials.

Non-combustible materials contribute significantly to the fire resistance of the structure, making it suitable for high-rise buildings and structures that need to adhere to stricter fire safety codes. In many regions, buildings designed with non-combustible materials can also be larger and taller, due to the reduced risk of fire spread.

In contrast, the other options present characteristics that are contrary to the nature of Type I construction. For example, fire resistance is a fundamental aspect of Type I classifications, especially compared to other types that may use combustible materials or have less stringent fire resistance requirements. Similarly, the use of mainly wooden structures and the classification being primarily for residential buildings do not align with Type I, which is more suitable for commercial and industrial applications where safety from fire is paramount.