What does Type IV Heavy Timber construction utilize?

Type IV Heavy Timber construction is characterized by the use of large wooden beams and columns, which contribute to its structural integrity and distinctive aesthetic. This construction type incorporates solid wood elements that are typically heavy and massive, allowing them to carry significant loads. The size and density of these wooden members also provide certain fire-resistant qualities.

In this construction type, the large dimensions of the timber can slow the rate at which the material burns, a phenomenon known as “charing.” As the outer layer of wood chars, it can protect the inner portion of the beam and maintain structural integrity for a longer duration during a fire event. This is why Type IV construction is often seen as a blend of traditional wood construction and enhanced fire safety features, making it a common choice for structures that require both aesthetics and durability.

Other options, such as brick and mortar (which are associated with masonry construction) and steel and concrete (typical of modern high-rise buildings), do not align with the distinct characteristics of Type IV Heavy Timber. The mention of plastic materials is also inaccurate since they do not contribute to the structural framework in the same way as heavy timber does.