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Foam-Lok 400 Spray Polyurethane Foam Insulation from Lapolla Industries provides ultra-high yield and enhanced energy efficiency in attics, cavity walls, and other crucial areas around the home. To maintain comfort and temperature (and reduce noise and moisture), the spray-applied material seals the structure for a continuous air barrier, which reduces heat transfer. Foam-Lok 400 adheres to framing members and substrates and can be used to fill stud wall construction, all in a single application. It meets building code requirements for use with no additional ignition barrier required.