Which foam application method is recommended for use on pooled liquid fires on the ground?

The roll-in method is particularly effective for application on pooled liquid fires because it takes advantage of the foam's ability to create a blanket over the fuel. By rolling the foam directly into the fire, the foam is able to suppress vapors and prevent the fire from spreading further. This method allows firefighters to control the situation more effectively, as it minimizes the disruption of flaming surfaces and ensures that foam reaches the burning liquid.

This approach is crucial for liquid fires, where the foam's role not only involves extinguishing flames but also preventing the release of flammable vapors, which can lead to reignition or further fire spread. The roll-in method is designed to be safe and effective in this scenario, providing both immediate fire suppression and long-term control of the hazards associated with pooled flammable liquids.