If you can tile on top do i need to prepare the old tile surface?
no you cannot you need to remove the tiles which are present and then apply the new ones.
of course you can. You need to prepare properly and use the correct adhesives. For further information visit the tilerworld forum
You technically CAN... but definately make your work easier and more durable if you go ahead and bust out the existing floor and start from scratch. There are incidentals you need to account for like total floor height and you run the risk of your new floor cracking where the grout lines are in your old floor.
Yes you most definitely can if the tile is down solid and is clean from grease and dirt etc.... You ll need to check exterior doors to make sure they ll open..A special modified thin set is strongly recommended and allow a minimum of 2 days (long if possible) before any foot traffic goes on the tile.This because there is no where for the thin set moisture to go and you don t want to break the bond.. No special prep work is needed aside from thoroughly cleaning the tile and grout. Don t set grout joint over grout joint if you have the same size tile.. Any questions you can e mail me through my avatar and check my qualifications there. GL