PRO Crawl Barrier is a high performance multi-layer extruded vapor barrier specifically designed to ensure low permeability to protect the building fabric from moisture vapor damage. PCB is manufactured with virgin polyolefin based resins to produce high tensile strength and superior puncture resistance. This 10 mil class 1 vapor retarder is a high gloss white offering a clean professional finish. Each roll is 10′ x 100′ and rolled on 32″ cores.