Which type of construction typically incorporates both masonry and wood components?

Type 4 construction, also known as heavy timber construction, is characterized by the use of heavy timber framing along with masonry elements. This type of construction integrates the durability and fire-resistance of masonry with the strength and design flexibility of timber, creating structures that have unique aesthetic qualities as well as robust structural integrity.

Heavy timber members are usually untreated and can be relatively large in dimension, often exceeding 5 inches in width and height. This construction type allows for large open spaces within the building, which is particularly valuable in structures like warehouses or commercial spaces. The combination of masonry and wood provides enhanced fire resistance, as the thickness of the heavy timber allows it to withstand fire exposure longer than lighter wood construction types.

Understanding the unique characteristics of Type 4 construction is vital for firefighting professionals, as it influences how fires behave in such buildings and how crews should strategize their approach to fire suppression and rescue operations.