This Mapei Anti Mould Tile Grout is a fast-setting (3-5 hours), water-repellent, flexible, and colourfast grout suitable for joints ranging from 2-20mm. It is ideal for use in kitchens, bathrooms, showers, wet rooms, and can be used over underfloor heating. The grout is suitable for interior and exterior use and its anti-mould properties prevent the re-growth of mould. Each 5kg pack covers approximately 23-24m² on 300x300x10mm tiles with 2mm grout joints. It is also suitable for use with underfloor heating and timber floors, and for ceramic, natural stone, and porcelain tiles. The average coverage can be up to 39 m².