Grout joints, caulks and sealants ARDEX FS Flex - Flexible grout for grouting tiles with thin joints €23.60 Flexible grout for grouting tiles and screeds in thin joints. Filling, sealing, grouting or grouting thin joints from 1 to 6mm. For grouting ceramic tiles, paving, vitreous or porcelain mosaic and natural stone that is not sensitive to moisture. Walkable after 4 hours. Exterior and interior. Complies with EN 13888 CG1. Add to cart