Renovation: Remove chipboards or plaster over?

[stjärnan]

Hello!
I am renovating a room in a house from 1917. The room was additionally insulated during a renovation in 1976, and inside the solid wooden walls, there is now wainscoting, 20 mm Styrofoam, construction plastic, chipboard, and textured wallpaper. To get a good surface for wallpapering, I thought of putting drywall on top, but I'm wondering if there's any point in removing the chipboards first? Instinctively, it feels good to be able to screw in the drywall anywhere. The downside is that I also want to sand a wooden floor that is under...yes, of course, the carpet. You would be able to access it better without the chipboards.

 

[justusandersson]

What is outside the plankstomme?

 

[stjärnan]

What is outside the plank frame?

A horizontal board cladding and then a standing cover panel of a newer model.

 

[justusandersson]

One must be careful not to trap material between two diffusion-tight layers. Chipboards normally do not add much.

 

[stjärnan]

Are plasterboard considered diffusion-tight material?

 

[justusandersson]

No.