For nearly 50 years, Griffolyn®Vapor Retarders made by Reef Industries, Inc. have been used for under slab, walls, and roof applications becoming one of the industry standards. Reef Industries has now developed a permanent and affordable solution for crawl space moisture control. The company is a leader in the manufacture of patented high-strength industrial plastic films used in the Griffolyn®System offering the very latest technology for sealing a crawl space permanently.