What is the inside of the basement wall?

[PhilipLj]

Hello,

I have started renovating my basement. On one of the exterior walls, there is a woven wallpaper that I have begun to remove. Behind the wallpaper, there is some kind of porous material that almost seems like a board of some kind. Behind that, there appears to be something that looks like a mass of wood chips. What is this material? What is the outer board? Do I need to remove the entire board, or is it enough to just remove the wallpaper? I should mention that I am a complete novice with houses and construction.

// Philip

 

[Stefan N]

It is träullit, do not remove it.

 

[cpalm]

And on the outside of the träulliten is plaster, i.e. not a board.

 

[PhilipLj]

And the outside of träulliten is plaster, i.e., not a board.

Thank you for the response! Do I understand correctly that one can patch plaster on these holes, then remove the wallpaper and paint with silicate, for example? Thanks

 

[cpalm]

Do I understand correctly that you can use repair plaster on these holes, remove the wallpaper later, and paint with silicate, for example?

Absolutely, but it's likely a hell of a job to remove wallpaper, filler, and paint down to the bare plaster.
You're thinking correctly when it comes to basement walls, but is there any moisture issue you need to solve?

 

[PhilipLj]

Absolutely, but it's likely a hell of a job to remove wallpaper, putty, and paint down to bare plaster.
It's good that you're thinking correctly when it comes to basement walls, but is there any moisture issue you need to address?

Yes, I’ve understood that unfortunately.. well, high humidity in the summer, but not directly visible on the walls at least. A small 2x5cm where the wallpaper had come loose and bulged out a bit. But maybe I'll aim to remove it in some places and then just go with it?

 

[cpalm]

But maybe consider removing it in some places and then proceed?

What I think is that it's partly pointless to paint with a color that "breathes" maximally if there is a more or less diffusion-tight intermediate layer. Also, that a true silicate paint only adheres to mineral substrates, i.e., clean plaster, and then it's quite important if it should turn out well. You can use a hybrid paint with silicate + acrylic additive, but if you still can't achieve a maximally open diffusion surface, perhaps other alternatives can also be considered.

 

[PhilipLj]

What I'm thinking is that it's partly pointless to paint with a color that "breathes" maximally if there's a more or less diffusion-tight intermediate layer. Also, a true silicate paint only adheres to mineral substrates, i.e., pure plaster, and then it's quite important if it is to turn out well. You can use a hybrid paint with silicate + acrylic additive, but if you can't achieve a maximally diffusion-open surface, you might consider other options as well.

Thanks for the help!!