Can I put a new backsplash on top of where an old tile backsplash once was?

If you are putting new tile over the old spot then it is best to remove the old drywall/plaster and replace with a concrete board so your tile will get a good grip on the wall. If you tile over an area that you only replastered it will not hold as well. If you are looking at laminate you must be certain that the repaired surface is very smooth as the laminate will still show the uneven surface underneath.

If you are doing granite, quartz or solid surface like Corian then final wall prep isn't as critical but it still needs to be relatively smooth for the best result. There are other backsplash materials that come in metals and decorative plastics that require glueing or taping to the wall. You need to have a smooth, dry surface for the tape or glue to attach to so it will stay where you want it.

And is the old one removed. If you removed the old backsplash, yes you can put new one over it. If you are tiling, you have to make sure you remove as much of the old glue as possible.

And tile over. If your using like a lamanite you may want to plaster and smooth out wall where the old backsplash was, so that there are no air pockets when you install the lamanate.

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