Stego Wrap vapor barrier uses multilayer extrusion and a blend of prime virgin resins to provide nearly zero permeance, with a high degree of puncture resistance and tensile strength. The product prevents water vapor, radon, alkalis, and other problem-causing materials from interfering with a concrete slab. It helps attain and maintain proper slab moisture, and preserve indoor air quality. Stego Industries LLC. 877-464-7834.