What is the maximum vertical spacing for fire blocking?

What is the maximum vertical spacing for fire blocking?

• A. 5 feet
• B. 10 feet
• C. floor and ceiling
• D. 15 feet

Answer: (C)

Fire blocking is used to stop the vertical movement of fire and smoke through concealed spaces in walls and floors. To be most effective across stories, the blocking is placed where the concealed space intersects floor and ceiling assemblies. That means you install it at the floor lines and at the ceiling lines, creating barriers at each level. It’s not about a fixed distance apart; the critical factor is the location where the space is interrupted by a floor or a ceiling, which is why the correct choice points to floor and ceiling.

Fire blocking is used to stop the vertical movement of fire and smoke through concealed spaces in walls and floors. To be most effective across stories, the blocking is placed where the concealed space intersects floor and ceiling assemblies. That means you install it at the floor lines and at the ceiling lines, creating barriers at each level. It’s not about a fixed distance apart; the critical factor is the location where the space is interrupted by a floor or a ceiling, which is why the correct choice points to floor and ceiling.