Stego Wrap 20-Mil Vapor Barrier is used as an under-slab vapor barrier. This Vapor Barrier is developed from the same proprietary blend of prime virgin resins and additives as the popular Stego Wrap 15-Mil barrier, and provides additional protection for crucial projects. This advanced multi-layer plastic extrusion blown film vapor barrier provides unrivaled moisture protection in even the most unforgiving nditions, such as intense fluctuating temperatures and humidity, and is frequently