ᐅ After Removing Tiles: Should Old Mortar Be Chipped Away or Smoothed Out?

Created on: 4 Oct 2024 19:59
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strebermeister
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strebermeister
4 Oct 2024 19:59
Hello everyone,

I have removed old tiles, and now the wall surface is very uneven. The old mortar was applied with many voids. What is the best way to proceed if the wall will later be plastered and wallpapered? Should the old mortar be completely removed, or can I just plaster over it and sand it smooth?

If new tiles will be installed later, what needs to be done? Does the old mortar definitely have to be removed then?

In the old kitchen on the upper floor, wallpapering is planned, and in the kitchen on the ground floor, tiles will be installed again.

This is my first time doing this, so any advice is greatly appreciated.

Good luck, Andreas
Wall exposed showing brick/concrete blocks with crumbling plaster, next to tiles.

Wall with exposed concrete blocks and crumbling mortar; beige tiles on the right.
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Buchsbaum066
4 Oct 2024 20:18
Well, in the past, tiles were not installed with a thin-set adhesive but properly leveled using tile adhesive.

The wall is not plastered. I would remove the old tile adhesive and then replaster the wall. New tiles can then be easily glued on. However, the wall must be plastered smoothly and evenly if tiles are going to be installed. It’s best to use plaster guides for this.

Alternatively, a thin drywall panel (plasterboard) could be glued on. That will also create a smooth, even surface.
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ypg
5 Oct 2024 10:05
This is thick-bed mortar.
Anything that is still firmly attached could theoretically be left in place. However, you will need a smooth wall again, especially for tiling. If there are holes, plastering will require a considerable amount of material. You can level it out somewhat and ideally create a properly smooth surface across the entire wall using drywall, as mentioned earlier. This can then be wallpapered or tiled accordingly. For bathrooms, a double layer is necessary, with the top layer being moisture-resistant. I’m not sure if the same applies to kitchens.
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Buchsbaum066
5 Oct 2024 22:53
Well, he probably wants a flush wall. Double drywall is out of the question because then the tile backsplash would stick out significantly.

The best approach is to chip off the protruding sharp edges of the old tile adhesive and skim coat the wall flush again. That way, you can leave the old adhesive underneath. It should hold fine. Then you can do whatever you want. It can also be easily removed from the old wall to create a flush surface.
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ypg
5 Oct 2024 23:29
ypg schrieb:

across the whole wall
Buchsbaum066 schrieb:

then the tile backsplash would obviously protrude quite a bit.
Across the whole wall, then nothing will stick out.