Styrofoam™ Brand Residential Sheathing adds up to an investment that will pay for itself in just a few years, and continue to provide value for years to come. Using Styrofoam™ Brand Residential Sheathing could lead to fewer callbacks resulting in an enhanced reputation for builders. Extruded polystyrene foam insulation like Styrofoam™ Brand Residential Sheathing is inherently resistant to moisture, which can wreak havoc on other building materials. Moisture can compromise the performance of cavity insulation and damage drywall, wood framing and OSB or plywood sheathing. Styrofoam™ Brand Residential Sheathing provides a one-two punch against moisture.