Does the substrate need to be repaired before installing SupraTile?

No – except for areas that have large cracks or missing cement pieces or divots. High spots and ‘concrete slugs’ should be grinded down. In this instance these areas will need to be filled in with a self-levelling compound (commonly referred to as Skim Coat) before SupraTile is installed. All that is then required is to sweep or vacuum the floor before starting installation. It is not necessary to sandblast or detergent wash the floor when the tiles are being loose laid.