Which statement describes the fire stopping wood thickness requirement?

Which statement describes the fire stopping wood thickness requirement?

• A. A vertical load-bearing member
• B. A decorative finish
• C. No less than 2 inches thick wood used for fire stopping
• D. An opening for ventilation

Answer: (C)

Fire stopping in concealed spaces relies on blocking material that can resist heat long enough to slow the spread of fire. When wood is used for fire stopping, it must be no less than 2 inches thick. This minimum thickness helps ensure the wood can perform as an effective barrier during a fire, maintaining the integrity of the stop between spaces or floors. The other statements don’t describe the fire stopping requirement: a vertical load-bearing member is about structural support, a decorative finish has no firefighting function, and an opening for ventilation would undermine the fire-stop barrier by providing a path for flames and smoke.

Fire stopping in concealed spaces relies on blocking material that can resist heat long enough to slow the spread of fire. When wood is used for fire stopping, it must be no less than 2 inches thick. This minimum thickness helps ensure the wood can perform as an effective barrier during a fire, maintaining the integrity of the stop between spaces or floors. The other statements don’t describe the fire stopping requirement: a vertical load-bearing member is about structural support, a decorative finish has no firefighting function, and an opening for ventilation would undermine the fire-stop barrier by providing a path for flames and smoke.