Kerakoll LevelFlex 20kg 
Levelflex is a fast setting, flexible, fibre reinforced and protein free cement based formulation designed for smoothing and levelling subfloors prior to the installation of floor coverings. LevelFlex can be applied from depths of 2mm - 50mm in one application and it is suitable for use on all common substrates including underfloor heating systems and timber substrates. LevelFlex is fast setting and therefore ceramic, porcelain and natural stone tiles can be applied after 3 hours and impervious floor finishes such as decorative vinyl after 24 hours.