Proper preparation of concrete is vital to a successful vinyl tile installation project. If the concrete is not prepared in the correct manner, the adhesive may not perform properly, the tiles may curl, crack and come loose, and the manufacturer's warranty may be voided. Besides any specific manufacturer's directions for the particular product you are planning to install, there are general preparations that should be done to concrete regardless of the type of vinyl tile you plan to install.
Vacuum or sweep the concrete thoroughly to remove all loose dirt and dust. Vinyl tile must have a clean surface in order for the adhesive to bond permanently.
Clean any ground in soil, oil wax, grease or other stains, using a household de-greaser and rinsing completely. Allow it to air dry.
Fill or patch any cracks or holes with a concrete patching compound, as recommended by the tile manufacturer.
Level any low spots on the concrete with a self-leveling compound, as recommended by the tile manufacturer.