Prefabricated house, poor sound insulation

One square meter of gypsum cladding weighs about 18 kg. That's significantly more than a gypsum board.

But 18kg is still practically nothing. I wouldn’t have high hopes there.

In addition, you also have to be careful not to attach too much weight to the walls. Otherwise vi

18kg is still practically nothing. I wouldn’t have much hope for that.

Maybe you could try using lightweight concrete cladding. But it might be too heavy for the gypsum fiber boards. Don’t want them to come down again.

If it is actually just the mass, you can work with Hawaphon.

If it is actually only the mass, you can work with Hawaphon.

How are these used? Stick them to the wall? Then wallpaper over them? Or how am I supposed to imagine it?

Double drywall makes a small noticeable difference. Our children's rooms facing the main street have double drywall sheets, the living rooms below do not. It is less, but not enough to apply it afterwards as the sole measure.

That would look very odd. I would rather double up one wall with Fermacell and apply Hawaphon in between.