Waterstop EC is a multi-layered, bentonite-based waterstop used to seal non-moving construction joints in concrete footings, walls, floors, and other areas to prevent water migration. It provides both free swell and delayed swell properties. Waterstop EC is available in standard roll sizes: 1/2- inch by 1 inch by 15 feet and 3/4-inch by 1 inch by 15 feet.Contact: W.R. Meadows, 800.342.5976; wrmeadows.com