Norcros Rock-Tite Mortar is a fibre reinforced pre-mixed sand:cement mortar specifically designed for bonding concrete, natural stone and porcelain paving slabs to both hardcore and solid bases. The mortar only requires the addition of water and contains the specially designed Rock-Tite additives to improve performance, workability and freeze/thaw resistance of the mortar mix. Use of Norcros Rock-Tite porcelain primer must be used as part of the system. High strength. Suitable for all types of paving slabs. Fibre reinforced. Comes with full system guarantee. Coverage 0.3m2 per 25Kg bag at 50mm thickness. Comes with the Norcros Guarantee for Life.