Ignition Barrier Coating is an intumescent latex-based product that forms a protective char-barrier when applied to open-cell or closed-cell spray polyurethane foam. It can be applied with a sprayer, roller, or brush. According to the maker, it meets code requirements for a nonprescriptive ignition barrier and should be used only in attics and crawlspaces that satisfy specific qualifying conditions. It comes in a 5-gallon pail for $340. Commercial Thermal Solutions, 800/664-0063, tigerfoam.com.