Embedded in concrete, across and along the joint, flexible waterstops prevent leaks in the joints of concrete structures where one side is subject to hydrostatic pressure. Flexible waterstops come in a variety of profiles and material types. To choose a waterstop suitable for your joint sealing needs, it's important to know the capabilities of various systems.
The most economical and widely used flexible waterstops are made of polyvinyl chloride (PVC) compounds. PVC has good elasticity, resists aging, and can withstand elongations of more than 300%. Thermoplastic elastomeric rubber waterstops resist a wide range of oils, common solvents, and aggressive chemicals. Polyethylene resists exposure to alcohols, acids, amines, and alkalis.
To accommodate varying degrees of differential movement, most flexible waterstops come in different profiles, widths, and thicknesses. Some common waterstop types are: ribbed flat, ribbed with O- or U-shaped center bulb, dumbbell flat, dumbbell with bulb, and tear web.