Grout Flex15 A polymer modified, fast setting, cementitious, wall and floor grout Kelmore’s Grout Flex15 is a highly flexible, polymer modified, fast setting, cementitious grout for walls and floors. Able to be used with all tile types, and available in a comprehensive range of popular colours, all complemented with a matching silicone, it is suitable in joints up to 15mm wide and features built in mould resistance. This efflorescence free grout has been formulated to facilitate the wash off, enabling the grout to be left to firm up in the joints without concern of it being difficult to remove from the tile face, resulting in a functional, aesthetically pleasing full grout joint. Demonstrating its versatility, Grout Flex15 is suitable for interior and exterior applications, in wet areas, including power showers, and in both domestic and commercial settings, as well as being compatible with underfloor heating systems.