Foam-Lok 400 is a breakthrough open-cell spray Foam insulation technology that is installed in attics and crawl spaces in one step with no ignition barrier required. It's ultra high yield, low density and no mix properties make it a contractors first choice. Lapolla's Foam-Lok 400 increases thermal performance. The groundbreaking insulation enhances energy savings and reduces energy consumption for the life of the structure, while maintaining its eco-friendly properties helping homeowners reduce their carbon footprint.