This document applies to all liquid-applied water impermeable products, based on polymer modified cementitious mortars, dispersions and reaction resin coatings, used beneath ceramic tiling, for external tile installations on walls and floors and in swimming pools. This document specifies the essential characteristics, the respective threshold levels and test methods for liquid-applied water impermeable products associated with tile adhesives. This document specifies the assessment and verification of constancy of performance, of liquid-applied water impermeable products beneath ceramic tiling. NOTE – This document does not contain recommendations for the design and installation of ceramic tiles and grouts in combination with water impermeable products.