The new tile will NOT bond to the existing tile and in a short time the tile will start to fail. It's very important that tile bonds to the substrate that it is being applied to. It will take some effort but in the end you guys will not have to do it twice. There are no short cuts when it comes to tiling.
Yeah, your going to have to remove the old if you want it to look good and last.
Gonna have to take the tiles down...
We tiled over our fireplace, but we tiled over brick, which I think hold different. We have not had any problems with it in 6 years, not any separation nor any tiles falling. We mortared to the brick directly and them grouted. I am attaching the before and after for you. I would be really careful to tile over tile because it might not hold if it is slick tile.
Thank you Ana.
It looks very nice. It is good to hear from someone who actually done it.
tiling over brick is much different than trying to go over tile. You can get get a good bond to the brick.
Monika, I agree with Burco, I'd think twice about doing it over tile. I know friends who did that and the tiles popped off after a while.
Thank you for the help everyone. Hubby has no choice but to take the tiles down.
Good luck! taking the tile down is not as hard nor cumbersome as one might think, plus you get any aggression out, good therapy! Just need to have the right tools. We took up my entire tile master bathroom floor in just a couple of hours.