This European Standard applies to all liquid-applied water impermeable products, based on polymer modified cementitious mortars, dispersions and reaction resin coatings, used beneath ceramic tiling, for internal and external tile installations on walls and floors. This European Standard gives the terminology concerning the products and specifies the test methods and the values of performance requirements for liquid-applied water impermeable products associated with tile adhesives. This European Standard specifies the evaluation of conformity and the classification and designation of liquid-applied water impermeable products beneath ceramic tiling. This European Standard does not contain recommendations for the design and installation of ceramic tiles and grouts in combination with water impermeable products.