Manufacturers of high performance polyethlylene vapor and gas barriers/retarders, weather protective barrier, Brownfields gas barriers for the construction and geomembrane industries. Raven is a full scale manufacturer with extrusion, lamination and converting capabilities. All products our produced within the strict guidelines of their ISO 9001:2000 certified quality management system. Get the facts before selecting a gas barrier membrane for your project, since regular polyethylene without any barrier resins added can retard some gases make certain you are selecting an actual gas barrier membrane. The Raven Absolute Barrier™ line of gas barriers including VaporBlock® Plus™ will offer an effective method of controling radon, methane and other VOC's from migrating through the concrete slab and into the structure. www.ravenefd.com