New studio in Norway

Hello, i have been looking at this forum for some time, and i have tried to understand as much of this as i can, so please guide me to the post if this has been covered before somewhere in this forum. I appreciate any help i can get. I am building a studio for tracking live drums, guitar and vocals, mostly rock. The shell of the building is finished. I don`t have neighbours to close, but i still want to gain as much sound reduction to the outside as i can. I have added some skp files with the mesurements . Celing height live room: 3, 58 m, sloping to 2,54 m Celing height control room: 2,54 m. Q 1 Design: Any comment on the design? Q 2 Outer and inner wall: Could this be a solution to gain sound reduction to the outside or am i totally lost? Does the vapor barrier count as a leaf? Q 3 Floor: I have done an experiment, dividing the floor into to "separate" rooms, I am sure there will be flanking, but pherhaps it will be minimized a bit. Any thoughts? As i said, just an experiment. Q 4, more floor: Can i rest the inner walls on the existing floor (not float), and "float "only the floor on 50 mm rockwool ground isolation , just to stop some impact noise?

Flanking is always an issue, but you cannot start designing a foundation that try's to minimize the flanking when you are actually weakening your structure. AND...the flanking that you are trying to reduce still exists! ;) Not allowing your bands to make a complete run to tie the entire wooden floor together is not a good idea. Like you said, the walls and the trusses are connected...and in fact, so is the floor system, even though it is cut up, the skid beams still transfer vibration. Build a strong foundation and you will have a better building. Also, if you take your "inner" wall and flip the sheetrock side so it is facing the sheetrock on the exterior wall, this would be better than what you have now.

Thanks for your fast reply. I see your point, like i said just an experiment :) Flipping the wall will be like an "inside out wall" right? Does the vapor barrier (plastic) 0,15 mm count as a leaf?

Does the vapor barrier (plastic) 0,15 mm count as a leaf?

Nope. It doesn't have enough mass to be considered a leaf. - Stuart -

A vapor barrier has a specific place to be installed in a wall. Can it be mass? Yes it can be mass because it can stop sound. But the goal of a barrier has nothing to do with acoustics so your question has no ground to stand on at this moment.

Thank you for your clarifying. :) I have been playing around with this design, and i made a corridor between my cr and live room.I like the idea to not having to go through the studio to get to the control room, Is this a bad idea, since i will be walking in the my "air"? I have seen this covered in here somewhere, but still confused.