VaporFlex® has been designed to perform as an ultra low permeable vapor barrier that exceeds all ASTM E1745 Class A requirements. VaporFlex® prevents the infiltration of moisture through concrete slabs and foundations, thus preventing mold formation and growth. VaporFlex® is manufactured from a special blend of virgin polyolefin resins and additives. VaporFLEX® is only manufactured by Layfield, strictly adhering to a registered quality management system that meets the requirements of the ISO 9001:2000 standard. We do not subcontract out the manufacturing of the VaporFLEX® products.