What distinguishes Type 4 construction from other types?

Type 4 construction is distinguished by its use of heavy timber, which provides significant structural strength and a higher fire resistance than conventional wood framing. The defining characteristic is that it incorporates heavy timber elements, such as large beams and columns, which can withstand fire for an extended period compared to standard wood framing. Additionally, Type 4 structures often have masonry exterior walls, enhancing their overall fire resistance and stability.

This type of construction is beneficial for building safety due to the fire-retardant properties of the heavy timber and the protective qualities offered by the masonry. The combination of these materials offers a balance of durability, fire performance, and architectural appeal. The other options would not accurately describe the unique aspects of Type 4 construction. For example, Type 4 does not utilize only wood components or employ balloon-frame designs, nor does it encompass solely noncombustible materials.