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Foamular® Insulating Sheathing extruded polystyrene (XPS) rigid foam insulation contains hundreds of millions of densely packed closed cells to provide exceptional thermal performance. It's also virtually impervious to moisture, unlike other plastic foam insulation products. Foamular weighs considerably less than plywood, OSB or other non-insulation materials so it's easier, faster and safer to install. Insulating Sheathing (IS), is ideal for either wood or metal framing construction, suits a variety of exterior finishes and creates an effective insulating envelope over the entire structure.Used in fire-rated exterior wall assemblies for application in a commercial building. Insulating Sheathing can be scored and snapped, cut, or sawed with common tools.Retains its long-term R-value year after year, even following prolonged exposure to water leakage, humidity, condensation, ground water and freeze/thaw cycling.Contains a minimum of 20% certified recycled content, certified GreenGuard Indoor Air Quality for Children and Schools, Energy Star Seal and Insulate Program, and NAHB Green approved.Owens Corning Foam Insulation, LLC now warrants a Lifetime Limited Warranty* on Foamular® (XPS) Foam Insulation products. This new, enhanced warranty indicates that for the lifetime of the product, Foamular® XPS Insulation products are free from defects in material and/or workmanship that materially affect the performance of the product in a building installation.