PVC Waterstop bands Joints are used at some points of concrete and reinforced concrete structures. In some parts, joints are defined as expansion joints in order to prevent damage caused by expansion and collapse of reinforced concrete structural elements. When the used cement finishes to receive the settling, the expansion is left in order to prevent the damage caused by the decrease in the volumetric capacity to the square from damaging the structure. The creep, expansion movements on the ground are so large that they can not be neglected, they are repetitive movements. Due to the expansion and ground movements, the joint which is arranged in the building is constricted. These joints are known as constriction constriction.