Waterstoppage is chemically treated granular bentonite used as a detailing accessory product with Volclay Waterproofing Systems. When wetted, Waterstoppage forms a dense, low permeable material that combines with the bentonite in the Volclay membranes to form a seamless waterproofing system. Typical application is around slab penetrations, pile caps, and grade beams prior to the waterproofing membrane installation. Waterstoppage is also applied to the roof deck of tunnels and earth covered structures prior to Voltex and Voltex DS installation.