Which statement correctly specifies the minimum thickness of wood used for fire stopping?

Which statement correctly specifies the minimum thickness of wood used for fire stopping?

• A. No less than 1 inch
• B. No less than 2 inches
• C. No less than 3 inches
• D. No less than 4 inches

Answer: (B)

The main idea here is that fire stopping requires a barrier with a specific minimum thickness to effectively slow the spread of fire through concealed spaces. Wood used for fire blocking needs to be thick enough to maintain its integrity long enough for occupants to escape and for responders to intervene. The correct minimum thickness is two inches. This ensures the wood blocking can perform its function across studs and between floors or through wall cavities where fire could travel, providing a reliable barrier under high heat. Using wood thinner than this would not meet the standard, while thicker blocking would still work but isn’t the minimum requirement.

The main idea here is that fire stopping requires a barrier with a specific minimum thickness to effectively slow the spread of fire through concealed spaces. Wood used for fire blocking needs to be thick enough to maintain its integrity long enough for occupants to escape and for responders to intervene.

The correct minimum thickness is two inches. This ensures the wood blocking can perform its function across studs and between floors or through wall cavities where fire could travel, providing a reliable barrier under high heat. Using wood thinner than this would not meet the standard, while thicker blocking would still work but isn’t the minimum requirement.