Type IV construction is also known as which type of construction?

• A. Steel
• B. Concrete
• C. Masonry
• D. Heavy Timber (HT)

Answer: (D)

Type IV construction, also known as Heavy Timber construction, is characterized by its use of large wooden structural members and offers a combination of aesthetics and fire-resistance properties. The defining feature of Heavy Timber construction is that the components, such as beams, posts, and decking, are made of solid wood or laminated wood products that are typically larger than the standard dimensions used in other types of wood construction.

This type of construction is designed to minimize the risk of fire while maintaining structural integrity, as the thickness of the wood allows for charring to occur at a slow rate, thereby prolonging its strength in the event of a fire. The North Carolina Building Code identifies this category specifically due to its unique properties and historical significance, especially in older buildings that were constructed when wood was a primary structural material.

The other types of construction mentioned—steel, concrete, and masonry—are distinctly different in their materials and structural characteristics, thus making them inapplicable to the definition of Type IV construction. Heavy Timber construction is particularly valued for its durability and aesthetic appeal, often seen in commercial buildings, schools, and some residential structures.