I was thinking of starting a new project at home :). The walls in our bedroom are not the best. The masonite boards that form the outer layer are gaping, the house moves a bit, and the wallpaper is bubbly; old electrical wires that have been papered over aren't helping either. The chimney is behind one of the walls, and it has shed plaster, and the masonite board there was loose. I nailed it at the edge, which resulted in it warping (from the heat?) and cracking instead.

Removing the masonite boards entirely should probably be step 1?

Then the question is, what should I put up instead? The masonite is thin, so a thick chipboard + a thick drywall on top of that could be tricky. At the same time, it should be something that holds up well.

I'm going to wallpaper over it, so the surface needs to be suitable for that too!

Feel free to share tips and thoughts :)
 
Ola78
Putting plaster when it is warm behind is not good, as the heat dries out the plaster. Instead, use a minerite board there, they withstand heat well and can be wallpapered. If you want a backing behind the boards but don't want it to build up, you can put strips, for example, 12 mm from the front edge of the stud and then nail, for example, a chipboard, plywood, or whatever you want behind in the strips.
 
One alternative is to expose the murstock, repair the plaster, and paint it.
 
We placed Minerit in the kitchen between the tiles and the chimney breast. Works well. But I think they are quite thick?

By trims, do you mean creating an air gap between the board I'm going to put up and the actual wall behind it? I believe it consists of horizontal planks. It's a bit difficult to see before all the boards are torn down, but you can see it in one spot. In other places, chipboard is obscured.

I read somewhere that it's good to have a 12 mm board + 13 mm plaster on the outside, but I'm wondering if it might work just as well with a decently thick chipboard + this kind of "putty?" on a roll that they sell as a restorer if you want to wallpaper over textured wallpaper. Except for the wall that gets warm, of course!
 
The photographer: Yes, it would have been nice, but it's visible from the other side of the wall where there's a living room. But to detach from the bedroom, I don't know how to do that, still want the bedroom to be separate :) But we'll probably have to fix it anyway.
 
Ola78
With trim I meant that you can nail a backing board so it aligns with the framework in the wall, then you have something proper to screw into instead of using plugs. This method presupposes that it is a stud wall and not a plank wall you have. Old houses can actually have stud walls for interior walls, we have it in our house from 1924. The thickness of minerit boards, if I remember correctly, is 12 mm. I hope I explained it in a way that was understandable.
 
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