Three-in-One Insulating Sheathing from Dow

Dow Building Solutions fills three needs in one with a new product for stick-frame walls. Styrofoam SIS, for structural insulated sheathing, provides structural shear bracing, wraparound insulation, and a water-resistant barrier in a single 4x8, 4x9, or 4x10 sheet with half-inch and one-inch thicknesses, providing insulation values of R-3 and R-5.5, respectively. Styrofoam SIS performs all three functions adequately, if not exceptionally, but its convenience and potential cost-savings are enticing and may encourage builders who don’t already incorporate all three of those functions to do so.

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