Modified PVC based flexible water holders produced in special sections. PVC water retaining tapes are used in construction joints formed at different times due to lack of continuous casting process in expansion and contraction joints in reinforced concrete structures in order to prevent water damage and damages of construction. They are produced in different sizes and types depending on their usage area. Dilatation helps to stretch the structure by creating voids. At the same time it prevents the passage of water from the dilatation. At the same time it helps the work of the building by acting as an ambulator in the building.