Dilatation joints are the interface between concrete placements intentionally created to facilitate construction. A cold joint is a joint or discontinuity resulting from a delay in placement of sufficient duration to preclude intermingling and bonding of the material, or where mortar or plaster rejoin or meet. The products used in waterproofing of building dilatations and movable joints are special ones resistant to permanent elastic and mechanical force. These products need to be UV resistance, mechanical resistance and easy repairability, such features as suitability for drinking water and constant water contact (depending on area on usage).