During overhaul operations, what is a crucial factor to prevent rekindle?

Ensuring complete saturation is crucial during overhaul operations because it minimizes the risk of rekindle by ensuring that all potentially combustible materials are thoroughly drenched. Even a small remnant of heat or smoldering material can cause a fire to reignite if it's not adequately saturated. Complete saturation involves applying water to all surfaces and materials that may harbor heat, including hidden or less accessible areas.

This approach not only extinguishes surface flames but also penetrates into porous materials that could retain heat, thus making it significantly less likely for a rekindle to occur. This safety measure is essential, as rekindles can lead to dangerous situations for firefighters and can compromise their efforts in fire suppression.

While monitoring fire behavior, using thermal imaging cameras, and rapidly cooling an area all contribute to effective firefighting tactics, complete saturation directly addresses the fundamental need to ensure that no heat sources remain, making it the most critical factor in preventing rekindle during overhaul operations.