What phenomenon occurs during rollover?

Rollover is a condition that occurs in a fire when unburned smoke and gases collect in the upper layer of a compartment and reach their ignition temperature. This phenomenon is characterized by the simultaneous ignition of these gases, leading to flames spreading across the ceiling. The presence of unburned fire gases indicates that there are still flammable materials within the environment, and when they ignite, it can create a rapid spread of fire across the overhead areas.

Recognizing rollover is crucial for firefighters, as it serves as an indicator of changing conditions within a structure. Understanding this phenomenon can help in developing strategies for ventilation and fire suppression. It highlights the importance of monitoring fire behavior to maintain safety and formulate effective firefighting tactics.