How to make the plaster adhere better?

[Carl 1918]

Hello!

I am renovating my kitchen. On one wall, there were built-in cabinets, and when these have been removed, part of the plaster has fallen off. I was thinking of filling the holes with husfix, but the problem is that the base (the old plaster) is so brittle that it just falls off as soon as you touch it.

Is there any way to better bind the old plaster before applying new plaster?

The wall in question is probably made of slag stone and covered with about 1½ cm of plaster.

 

[Bjoern]

Remove everything that is directly loose, then prime and fill with husfix or gypsum plaster or something.

If you have little surface area, you can slap on a drywall that you glue with gypsum plaster. But as mentioned, prime first.

 

[Carl 1918]

Ok. Primer then. I’ll check with the local hardware store.

Thanks for the help.

 

[Thomas59]

I'm absolutely not a pro at plastering but stumbled upon something similar when I was renovating a kitchen. I started picking at some cracks and half the wall came down. The plaster was from 1904 and made on a base of reed (?) and some wire.

I primed and then also screwed chicken wire between the studs and then plastered on this. It was a large area and I tried using general purpose filler but got cracks during drying (maybe too thick layers), so I switched to some form of plaster that the building market recommended. Worked fine and with a bit of practice, I got the hang of it pretty well.

I have no idea if it was the correct method but it worked for me.

 

[Bjoern]

Am absolutely not a plastering pro but encountered something similar when I was renovating a kitchen. I started fiddling around with some cracks and half the wall came down. The plaster was from 1904 and made on a base of rushes (?) and some wire.

I primed and then I also screwed chicken wire between the studs and then plastered on this. It was a large area and I tried house fix but got cracks during drying (maybe too thick layers) so I switched to some kind of plaster mortar that the hardware store recommended. Worked fine and with a little practice, you got quite good at it.

I have no idea if it was the correct procedure but it worked for me.

Yes, if it's that bad then chicken wire is king. That sounds like a reasonable approach, after all, that's how it's done when plastering.