Zip System R-sheathing includes a layer of insulation to provide a thermal break and boost R-values, integrating structural sheathing, water-resistive barrier, and continuous insulation into one product. One of the most common criticisms of the product is that the insulation is on the inside, and not outside of the OSBÑbut having a nail base on the exterior solves issues when it comes to installing siding, trim, and windows. The article discusses the technical evaluations that certify R-sheathing for code compliance, and includes installation recommendations from builders who have worked with the materials. A sidebar explains how Zip R-sheathing can be used as a nail-base panel over existing roof sheathing.
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