I used the wrong type of tiles (wall tiles) to floor my bathroom. Now these tiles, which are porous, have collected scum and algae in the tiny porous holes. They are impossible to bleach (with Clorox) or acid clean. So now I want to replace these tiles. Can I just lay new tiles on top of the old ones without removing the old tiles first? It would save me a lot of time. Thanks.
Since you cannot clean the old tiles of their nasties, you will just be sealing them in and encouraging the same problem on the new tiles. Can't they be removed? What were they attached with? If they were self-stick, you might be able to remove them with heat gun and some elbow grease.
Hi the problem might be mold --if you cover over it. Maybe if you had a way to insure the floor was completely dry so no mold would grow. It is technically possible. I saw a new product on tv today. It looked like a thin soft plastic / foam. It is laid down first, cut (it looked easy to do). then the new tile is laid on top. I think the softness helps fill in the grout lines of the old tile. It didn't give the name of the product. Good luck!
Tile needs a strong cement board/green board type backing underneath for support. While I know it will save you time to put tile on tile, don't do it. In the end, it will cost you in repairs and aggravation.
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