Which term describes a wall extending above the roof to limit the horizontal spread of fire across the roof or to adjacent structures?

Which term describes a wall extending above the roof to limit the horizontal spread of fire across the roof or to adjacent structures?

• A. Fire Door
• B. Draft Curtain/Curtain Board
• C. Parapet Wall
• D. Interior Finishes

Answer: (C)

Parapet walls extend above the roofline to act as a fire barrier at the roof edge, helping to stop fire from moving horizontally across the roof and into adjacent structures. By projecting beyond the roof, they interrupt the path flames and embers can take along the roof plane, reducing radiant heat exposure and providing a safer, contained edge for firefighting operations. This makes parapet wall the best term for describing this feature. A fire door protects openings in walls inside the building, not a roof-edge barrier. A draft curtain or curtain board controls air flow through large openings, not the extent of fire spread across a roof. Interior finishes refer to materials inside the building, not features that extend above the roof.

Parapet walls extend above the roofline to act as a fire barrier at the roof edge, helping to stop fire from moving horizontally across the roof and into adjacent structures. By projecting beyond the roof, they interrupt the path flames and embers can take along the roof plane, reducing radiant heat exposure and providing a safer, contained edge for firefighting operations. This makes parapet wall the best term for describing this feature. A fire door protects openings in walls inside the building, not a roof-edge barrier. A draft curtain or curtain board controls air flow through large openings, not the extent of fire spread across a roof. Interior finishes refer to materials inside the building, not features that extend above the roof.