A collapse zone should be formed when which strategy is in effect?

• A. Defensive strategy
• B. Interior operations
• C. Early ventilation
• D. Offensive strategy

Answer: (A)

A collapse zone is a safety buffer around a structure that could fall, designed to keep firefighters and bystanders out of the path of moving debris. This is most critical when a defensive strategy is in effect, because crews are operating from the outside to control and contain the fire rather than going inside to perform searches or interior attacks. In that defensive posture, the structure remains more at risk of sudden failure, and there may be limited or no opportunity to rescue anyone inside, so clearly marking and enforcing a collapse zone helps prevent injury from falling components. Interior operations or offensive strategies focus on access, fire suppression from within, and rapid interior progress, where the immediate priority isn’t establishing an exterior collapse perimeter in the same way. Early ventilation is about heat and smoke management and does not by itself establish the exterior collapse safety boundary. Therefore, a collapse zone is formed when defensive strategy is in effect.