The thickness requirement for cross-laminated timber floors in Type IV construction is mandated to be at least how many inches?

• A. 2 inches
• B. 3 inches
• C. 4 inches
• D. 5 inches

Answer: (C)

In Type IV construction, also known as Heavy Timber construction, cross-laminated timber (CLT) plays a crucial role due to its structural and fire-resistant properties. The North Carolina Building Code specifies minimum thickness requirements for CLT elements to ensure they can withstand various loads and provide adequate fire resistance.

The mandated minimum thickness for cross-laminated timber floors is set at 3 inches. This thickness is important because it provides the necessary structural integrity to support the loads applied to the floors, while also contributing to the overall fire-resistance ratings required in Type IV construction. Having at least 3 inches of thickness ensures that the timber is robust enough to handle the stresses it will encounter in a building application and assists in meeting safety regulations.

Understanding this requirement is essential for anyone involved in design or construction within this building type, as it helps ensure compliance with safety and performance standards established in the building code.