What component helps to limit the vertical spread of fire within walls?

• A. Fire stops
• B. Fire Walls
• C. Type III
• D. Exit access

Answer: (A)

Fire stops limit vertical spread of fire within wall and floor cavities by interrupting the path of flames and hot gases in concealed spaces. They fill or seal gaps in stud bays, around penetrations, and at floor/ceiling assemblies so heat cannot climb through the walls as easily. This helps compartmentalize the building, slowing or stopping fire from moving upward and into adjacent spaces, and supports the fire-resistance intended for the wall assembly. In contrast, a fire wall is a full-height, material-specific barrier designed to resist fire across spaces; Type III is a construction type designation, and exit access refers to the path of egress, not to preventing fire spread within walls.