Slim interior wall - sound, stability, and thickness?

[radioop]

An open question.
I guess that two OSB and two drywall dampen close to the small amount of insulation that ultimately exists. At least 15% is already drywall and wood..

The question is how stable it becomes and/or how to make it stable?

I'm thinking like this:

Two layers of OSB and two layers of drywall provide quite a bit of mass in themselves, and probably dampen a lot of sound even before you start talking insulation. Wood and drywall account for a large part of the wall's surface weight, as you say.

But stability then – I agree that's the big question. I understand that 34 studs might be over the top, but with 45 studs, a crossbar in the middle, and perhaps fiber drywall on both sides, it should still be a wall that feels quite solid, even at full height. Especially if you go with cc300 or cc400.

Then I also thought about whether you could insert OSB between the studs - without building out the wall more. That should be able to give a more "locked" feel, especially if you glue the board to both the stud and the drywall - but then maybe fiber drywall is overkill.

 

[Lilllen]

An open pondering. I guess that two OSB and two plasterboards dampen around the small amount of insulation that it's believed will be there. At least 15% is already plaster and wood..

The question is how stable it becomes and/or how to make it stable?

Exactly, just 4 layers of boards overlapping - joints in different places, should be both stable and quite quiet. If you want it even more stable, you might be able to glue it as well. Although, it might be a bit more difficult to build. A normal wall might also have an easier time accommodating expansions/contractions(?) Now, I've never built a wall like that, or any other wall for that matter, I should add...