The JOINTS are high quality flexible, stabilized PVC-P profiles for use as take up joints, or vertical and horizontal expansion joints in reinforced concrete guaranteeing a perfect watertight seal even under pressure, or where there are air gaps or foreign bodies in the joints required when building dams, foundations, canals, tunnels and similar. The PVC-P used guarantees a high ageing resistance, as well as excellent resistance to alkalies, brackish water, and acidic environments. Should the structure be continuously exposed to hydrocarbons or vegetable based alkalies, a special type of PVC-P can be supplied. The various types of waterstop joints are available to resist the high stresses the material will be subjected to during settlement of the building, as well as its normal expansion and contraction due to temperature fluctuations.