What is designed to prevent the spread of fire within and/or between structures, extending from foundation to through the roof?

• A. Fire Wall
• B. Fire Door
• C. Fire Curtain
• D. Fire Barrier

Answer: (A)

A fire wall is built to stop fire from spreading both within a building and between buildings by delivering a continuous, fire-resistance-rated barrier from the foundation up through the roof. It creates separate fire areas and must remain intact and continuous, with any openings (like doors or penetrations) protected to maintain the rating. This continuous, full-height, rated barrier is what prevents flames, heat, and smoke from crossing from one side to the other, even through the roof.

A fire door is just an opening within such a wall and doesn’t itself span the structure. A fire curtain is used to close large openings and isn’t a building-wide barrier. A fire barrier helps compartmentalize within a structure but doesn’t necessarily extend from foundation to roof.