What are the boards under a roof that separate voids and create heat banking areas called?

The term for the boards under a roof that separate voids and create heat banking areas is "curtain boards." Curtain boards are essential in fire safety as they help to contain heat and smoke in specific areas, thereby reducing the risk of fire spreading throughout a structure. They allow for better management of heat and can create safer environments during a fire by preventing the rapid spread of flames.

These boards serve as barriers that can redirect heat, contributing significantly to the overall fire protection design of a building. By containing heat to certain zones, curtain boards facilitate safer evacuation routes and improve the efficacy of firefighting efforts. This concept is vital within the context of fire safety as it emphasizes the importance of planning and constructing buildings with appropriate fire barriers to enhance life safety.

While the other options may relate to fire safety practices, they do not specifically describe the function or purpose of boards designed to separate voids and create heat banking areas under roofs.