Which foam application method directs foam to the ground near the front edge of the burning liquid pool?

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

Answer: (C)

A foam blanket is built by how the foam is placed onto the fire. The roll-on method delivers foam by rolling the foam solution along the ground right in front of the burning liquid, creating a continuous blanket that starts at the front edge and spreads across the surface. This approach puts foam where it’s most needed—on the ground near the leading edge—so it forms an immediate barrier that cools the fuel and slows vapor release as the pool edge advances.

In contrast, dropping foam from above (rain-down) doesn’t guarantee a tight, edge-initiated blanket; applying foam from a bank toward the pool (bank-down) targets the ground differently and isn’t as focused on rolling a continuous front-edge layer across the liquid surface. The venturi method describes how foam concentrate is mixed into water rather than where the foam is placed.