One component cementitious mortar fibre reinforced for flexible waterproofing Sikalastic® -1K is a one component, flexible, fibre-reinforced mortar, based on cement modified with special alkali-resistant polymers. It also contains fine fillers, selected graded aggregates, plus special waterproofing additives to produce a flexible mortar that is ideal for waterproofing surfaces subject to flexural strain. Sikalastic® -1K is suitable for application by brush or trowel. Protection of concrete surfaces according to EN 1504-9, principles 1: protection against penetration (coating); 2: control of moisture (coatings); and 8 increasing resistivity (coating)  Waterproof protection of concrete structures including tanks, basins, pipes, etc.  Waterproofing external wall surfaces to be backfilled in the ground  Internal waterproofing of walls and floors, in basements for example  Waterproofing of terraces and balconies over concrete or prepared existing tiles  General waterproofing of concrete surfaces  Flexible protection coating for reinforced concrete structures against the effects of de-icing salts, freeze-thaw and carbon dioxide