Can you glue tile on top of tile?

Answer 1

Sure can, but if its waxed tile you should rough it up unless there's a chance its got asbestos in it. Then use a primer sealer over that top to give the glue something to bind to. Also remember that the new tile is only as good as the old tile that's down. If the old stuff comes loose your new tile job is shot.

Answer 2

Technically you can, but it is not recommended. If the old tile is loose, cracked, or not flush it will cause the new tile to crack, pop out, or break. If you pay a hard surface, such as a cement board over the old tile first you can make it work, but it may be wise to remove the old tile before installing new tile.