Which option is NOT a foam application method?

• A. Roll-on
• B. Fog with water
• C. Base-of-the-fire
• D. Bank-down

Answer: (D)

Foam application methods are ways to place foam on or near the fuel to create a stable blanket and suppress the fire. The most effective foam methods involve directly delivering foam to cover the surface or to the base of the fire so the foam can cool the fuel and separate it from air.

Roll-on is a classic foam method where foam solution is spread across the fuel surface to form an even blanket quickly, which is essential for spreading and smothering the fire.

Base-of-the-fire is another foam-focused approach, applying foam directly at the base to cool the fuel and cut off the flame at its source, which helps control the spread and extinguish the fire effectively.

Fog with water is not a foam method at all; it uses water in a fog pattern rather than foam concentrate to create a blanket, so it isn’t considered a foam deployment technique.

Bank-down, in this context, isn’t categorized as a foam application method. It refers more to how the stream is directed or banked to the scene rather than a distinct foam-blanket deployment technique. In this question’s framing, the two primary foam methods are roll-on and base-of-the-fire, while bank-down is not treated as a foam-application method.