Which Class B foam application method involves rolling foam onto the surface?

Which Class B foam application method involves rolling foam onto the surface?

• A. Roll-On
• B. Bank-Down
• C. Rain-Down
• D. Spray-Down

Answer: (A)

Rolling foam onto the surface creates a continuous foam blanket directly on the hydrocarbon, which is essential for isolating the fuel from air and cooling it quickly. In this method you keep the nozzle close to the surface and move it along to push foam across, forming an even layer rather than letting foam fall from above. This approach delivers fast, edge-to-edge coverage and minimizes runoff because the foam is deposited as a blanket right on the fuel rather than raining down. Other application styles involve foam coming from above or being directed to the surface in different patterns, which can be less controlled for creating a uniform blanket on horizontal fuels. So, the technique where foam is rolled onto the surface to form that blanket is the Roll-On method.

Rolling foam onto the surface creates a continuous foam blanket directly on the hydrocarbon, which is essential for isolating the fuel from air and cooling it quickly. In this method you keep the nozzle close to the surface and move it along to push foam across, forming an even layer rather than letting foam fall from above. This approach delivers fast, edge-to-edge coverage and minimizes runoff because the foam is deposited as a blanket right on the fuel rather than raining down. Other application styles involve foam coming from above or being directed to the surface in different patterns, which can be less controlled for creating a uniform blanket on horizontal fuels. So, the technique where foam is rolled onto the surface to form that blanket is the Roll-On method.