Soundproof interior wall erglad 45 cc30....

[M_junken]

Planning to fix up a room at home and I find it very lyhört to the room next door, and when I sawed a hole in the wall, I understand why! The wall is currently 10mm masonite on each side, glued onto 45X45mm studs with cc30, and otherwise it's completely empty.
I've been trying to look around a bit on soundproofing and my first thought since it's 45mm is to tear down the boards, frame a new wall with 45X45 studs about 10mm from the existing studs (read on Isover's website that the distance is good), and put in insulation and OSB + gypsum.
But after thinking a bit, I'm considering if I can leave the boards as they are, meaning leave the wall untouched, and frame the new wall as I planned with a bit of space and insulate it with 45mm insulation. Would that work, or would it be too flimsy with 45X45?
Is it good or bad to leave the wall untouched?

Hope you get what I mean in the rambling

//Micke

 

[slacker]

From a sound perspective, staggered studs are always the best solution, i.e., you install another layer with the framework shifted against the previous one. Make sure to use insulation intended for sound, such as isover piano. "Regular" insulation is intended for thermal insulation and not specifically for sound. So the choice is yours, do you have space? Add insulation and add more studs. Do you want a thinner wall? Tear everything down and build a new one with 70 studs osb/drywall or just double drywall.

 

[M_junken]

I have limited space, but I would prefer not to use 70mm studs. Would 45mm studs be sufficient if I frame the new wall 10mm from the old one, or would that be too weak?