how you plan on screwing them down? i suppose you could but if you want something that will last i wouldnt.
i have heard that you can rough up the surface of the tiles and skim them and then lay the tile directly over that but that might cause more problems then it would to take it all out and start over. and think of the extra weight on the floor going over it with more tile.
i have heard that you can rough up the surface of the tiles and skim them and then lay the tile directly over that but that might cause more problems then it would to take it all out and start over. and think of the extra weight on the floor going over it with more tile.