ᐅ Kitchen wall – former tile backsplash – re-plastering

Created on: 12 Jan 2026 21:25
H
hoppelstrasse
H
hoppelstrasse
12 Jan 2026 21:25
Hello,

I am a complete beginner when it comes to plastering and filling.

What is the best step-by-step approach to get this area properly smooth again? I would also appreciate tips for the section with the water and wastewater pipes, where the plaster sounds hollow (probably foam insulated and then plastered), to restore it properly, even though the kitchen will be installed in front of it.

Additionally, I have a 10 cm (4 inch) core drill hole—formerly the exhaust vent for the hood—that I want to seal. I was advised to close it with LM21, with about 16 to 20 cm (6 to 8 inches) of mineral wool inserted in the middle. The exterior wall is made of 36 cm (14 inch) Poroton bricks. Does this seem appropriate?

Unfortunately, some of the base tiles are already hollow as well. I would leave them as they are or seal them with acrylic since the kitchen will be placed in front of them.

The new kitchen is arriving next week, and we only got the keys yesterday.
Close-up of a rough concrete wall with chipped plaster and uneven surface.

Kitchen under renovation: walls exposed, yellow insulation strips, installations visible.

Open sanitary installation in bathroom with fixture, socket, and wall cracks.

Yellow interior wall above beige floor tiles with edge and scratches.
Y
ypg
12 Jan 2026 23:10
That all seems to be exactly as needed?! Nothing fancy is required. Just paint it nicely, the way you want it. Have the kitchen installed, then stick the countertop or another wall design onto the wall. At most, insulate and close the outlet.

Who ordered the kitchen? You or the landlord?
H
hoppelstrasse
13 Jan 2026 04:40
Hi,
we ordered the kitchen for the day before the move. We are the homeowners and only received the keys on Sunday. The seller kept postponing the installation date after New Year’s.

A wooden backsplash will be glued where the tile panel used to be. I’m uncertain about the substrate there and whether the silicone/acrylic sealant will hold long-term on the damaged plaster.
N
nordanney
13 Jan 2026 10:42
hoppelstrasse schrieb:

A wooden back panel will be glued where the tile backsplash used to be. I’m unsure about the surface and whether silicone/acrylic will hold long-term on the damaged plaster.

Use a strong construction adhesive, and the wall is more likely to fall apart before the back panel comes loose. Overall, I don’t see any need to make it "look nice" since the kitchen will be in front of it anyway. Better to spend your time on other things ;-)
H
hoppelstrasse
13 Jan 2026 23:31
nordanney schrieb:

Use a strong construction adhesive, and the wall is more likely to collapse than the back panel coming loose. Overall, I don’t see any real need to make it look “nice” since the kitchen will be in front anyway. Use your time for other things ;-)

So, I measured today… we definitely need to apply filler since our wooden paneling will be installed slightly lower later. I bought primer and bonding plaster today.

First, I would sand down the transitions to the paint (on gypsum plaster) a bit. Then dust off the surface and apply the primer. After that, apply the bonding plaster twice and then sand it.

Finally, I would paint the entire wall surface with bonding primer and then apply the topcoat.

Does that sound right?