Hi,

I'm planning to convert a larger room into two smaller ones and am considering different solutions.

To get light into both rooms and avoid moving/building a new window, the wall would need to go between the balcony door and the window. The problem is that the frame is only about 8cm wide, and an interior wall with decent soundproofing, etc., I assume is wider than that? How would you have done it?

Suggestions for a solution with radiators are also welcome.

Balkony door and window with star-shaped light fixture hanging, wooden floor, and radiator nearby.
 
45 mm stud with 1x12.5 mm fibergips on each side becomes 7 cm, insulate as usual. Do not place the drywall tightly against the wall/floor/ceiling, but leave a gap of 5 mm and apply a sealant. I don't think it can get better than that without moving the window, but it should work if there isn't going to be a disco in one of the rooms. Aesthetically, it probably won't be completely perfect though. :)
 
P Probably Wrong said:
45 mm stud with 1x12.5 mm fireproof plasterboard on each side becomes 7 cm, insulate as usual. Do not place the plasterboards tightly against the wall/floor/ceiling, but leave a gap of 5 mm and use flexible sealant. I don't think it can get better than this without moving the window, but it should work if it's not meant to be a disco in one of the rooms. Aesthetically, it probably won't be completely perfect though. :)
The plan is not a disco, but more just so that you don't hear exactly what the person in the next room is saying :) How thick is a "normal" interior wall if you don't need to take the window into account?
 
P pwskg said:
The plan is not a disco, just so you don't hear exactly what the person in the next room is saying :)
How thick is a "normal" interior wall if you don't need to consider the window?
It varies. It's not uncommon to have interior walls built with 45 mm studs, although 70 mm is probably more common (then you get a thickness of at least 8.5 cm depending on what type of drywall you use). When high demands are placed on soundproofing, double 70-mm, extra insulation, and double drywall are usually used, reaching a thickness of almost 20 cm. As long as you use soft sealant between the drywall and the floor ceiling wall, I think 45 mm will work fine. Of course, you'll hear if someone is talking loudly near the wall, but sound travels through doors, windows, and all sorts of things in a house, and it's rare for rooms to be completely soundproofed. :)
 
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