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Water Break. The Delta Footing Barrier is a three-ply impermeable membrane that goes on top of freshly poured footings before the foundation is built. Its purpose is to prevent water from wicking up through the concrete and saturating the basement walls. According to the maker, the membrane is flexible enough to follow the contours of a keyway. It has an anti-slip surface, a polyethylene center, and a polyester needle-punched fabric bottom that sticks tightly to fresh concrete. It costs about $1.20 per square foot. Cosella-Dorken Products, 888/433-5824, cosella-dorken.com