I have a living room wall that was a bit cracked and bulging. Today I tore down everything that could be torn down. There was putty directly on my blue concrete/lightweight concrete and then wallpaper directly on that, which has been there for about 40 years. The question now is how do I fix it a la 2008? Some putty, about half, is still there and shows no tendency to fall off in the coming years. Do I have to chip everything away?

Can I put drywall directly against the concrete and then wallpaper? Do I need to make any kind of frame construction, and if so, what kind? Or do I do something completely different?

It's a townhouse, and the neighbor lives on the other side of the wall, so it's not an exterior wall or basement. Additional insulation is not an option.
 
If it's your only wall of blåbetong, it is an option to replace it to get rid of the radon problem...
 
Well, if it were that simple, there are many blåbetong walls unfortunately. That problem is controlled with FTX etc.
 
merkez said:
I have a living room wall that was slightly cracked and bulging. Today, I tore down everything that could be torn down. It was filler directly on my blåbetong/lättbetong and then wallpaper directly on that which has been there for about 40 years. The question now is how do I fix it up a la 2008? Some of the filler, about half, remains and has no tendency to fall away in the near future. Do I have to hack everything away?

Can I put drywall directly on the concrete and then wallpaper? Do I need to make some stud construction and if so, what kind? Or should I do something completely different?

It is a townhouse and the neighbor lives on the other side of the wall so it is not an exterior wall or basement. Further insulation is not an option.
Fill it again! If the old stuff lasted 40 years, you shouldn't expect anything different again. Especially as there likely won't be any more cracks.

If you want drywall, you can glue the sheets with plaster mortar. Lay thicker lines where you've knocked down the filler.
 
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