The surface must be free of dust and dirt. Tiles must be fasten to the surface using dowels. Make holes for the dowels on the tile with electric instrument. Fix the tiles with dowels and in the end use the montage foam to fix the seams if the tiles are divided by a few centimeters. Foam is not needed if they are stacked close to each other. Tiles can also be fasten without dowels if tiles adhesive is used, which is intended to be applied to the surface of the tiles. After finishing, you can finish the surface work: drywall, plaster, board, etc. Before the plaster on the surface there should be a metal mesh and concrete contact so that the plaster does not slip on this surface.