What type of construction features noncombustible exterior walls and partial interior wood materials?

Type 3 construction is characterized by noncombustible exterior walls combined with interior elements made of combustible materials, such as wood. This type is often seen in residential buildings where the structural framework can include wood and other materials that may ignite and burn, while still having the benefit of noncombustible exterior walls that provide some level of fire resistance.

This construction type is notable for its balance, where the fire-resistive exterior helps slow down the spread of fire from the outside, while the interior wood elements can affect how a fire behaves within the structure. In comparison, Type 1 construction generally involves all noncombustible materials, offering the highest level of fire protection, while Type 2 construction has similar noncombustible requirements but can include some materials that are less fire-resistant. Type 4 construction, often referred to as heavy timber, predominantly features large timber components that are less susceptible to ignition, but it fundamentally differs from Type 3 with its emphasis on solid wood rather than a mix of noncombustible and combustible materials.

Understanding these distinctions regarding construction types is crucial for firefighters in assessing risks, determining attack strategies, and effectively managing resources during a fire incident.