Basement wall

[TL44]

I'm planning to fix up a basement wall in an undrained basement. Mostly because all the plaster has come off at the bottom of the wall. Then I'm thinking of painting over with silicate paint. Since it's a basement wall, it's not just any filler and paint that can be used, so I have a few questions:

I'm uncertain about what the wall is currently painted with. Are there ways to find out what type of paint it is?

The wall is plastered with some type of lime plaster, unsure if it's regular lime plaster or lime-cement plaster, with träullit underneath. What should I use for plaster/filler? Right now I'm considering three options:

Dana lim filler 611 http://www.danalim.se/produktkatalog/bygg/spackelmassor/filler-inomhus-611/

Husfix

Kalkputs

Which would you recommend for this? Additional tips are also appreciated!

 

[Liteavvarje]

If it is loose in several places, tap lightly around to hear if it is loose
is it a foundation wall there,
Träullit is not uncommon in older houses

 

[TL44]

If it is loose in several places, tap gently around to hear if it is loose
is it a foundation wall there,
Träullit is not uncommon in older houses

Yes, it was loose where I have scraped off as shown in the picture. But even in other places, it sounds a bit hollow when you tap. What I have scraped off as shown in the picture seems to be something that has been applied afterward, like some kind of filler/gypsum.
Yes, it's quite an old house, I would guess from the 1940s.

 

[Liteavvarje]

It might be an old damage that has been repaired; it is located by the stairs, an area that is somewhat exposed. The hollow sound you mention might be hard to hear as there is wood wool board on the wall, they aren't solid but echo a bit. As you say, with all the plaster that has fallen at the lower edge of the wall(s), it is in more places, you also mention an undrained foundation; it could be some moisture from outside causing it to release. I interpret that there are wood wool boards around the outer walls (it was done like that in the past), it's not uncommon for moisture to accumulate at the lower part of the foundation wall, it creeps under the wall from outside.

 

[TL44]

It could be an old repair that has been fixed, it's located near the stairs, an area that's a bit exposed. The hollow sound you mention might be hard to hear since there's wood wool board on the wall. They're not solid and tend to echo slightly. As you mentioned, with all the plaster falling at the bottom of the wall(s), if it's happening in multiple spots, and with an undrained foundation, there might be some moisture from outside causing this. I interpret it as there being wood wool boards around the exterior walls (a common practice in the past) and it's not uncommon for the lower part of the foundation wall to get damp, where it creeps under the wall from outside.

Yes, it's probably something that has been repaired before. It looked different in structure compared to the rest of the wall. But the question is what I should use to repair it. As I wrote in the first post, the three options seem best. What do you think?

 

[Liteavvarje]

It's probably lime plaster there before, so take that, and paint with silicate paint.

 

[TL44]

It's probably lime plaster there before, so use that, and paint with silicate paint

Okay, any tips on some lime plaster?

 

[Liteavvarje]

Common lime plaster is available at department stores, take a bag, whatever is left over for the time being, store it in a dry place.

 

[TL44]

Regular lime plaster is available at the stores, grab a bag, whatever is left for the time being, store it dry

Ok, thanks for the tips!