Wall between control and live room question

I am building a standard double stud wall between my live and control rooms with a small air gap in between. I am not sure if this wall, on the live room side (left of the picture) should extend outside the other live room walls boundarys and join the outside wall. I have attached a diagram showing what I mean with the live room walls extension circled in red. Could anyone comment on this please. I think that it should extend out to provide a total double wall barrier between the two rooms but this means the inside and outside walls in my system will join at these points.

If you want proper isolation you don't want to touch the wall with anything. Leave a 4-5mm gap between the new wall and the inner shell and fill that with acoustic caulk. Read the FAQ in the reference section for more. Florian

It's the new wall and the OUTSIDE wall I am talking about, not the inner wall. The inner walls right around the live room have to touch other wise the walls will not be stable. This wall has two functions: (1) its part of the inner wall system (2) its part of the double wall between the two rooms. JG

JohnGardner wrote:

This wall has two functions: (1) its part of the inner wall system (2) its part of the double wall between the two rooms. JG

John, I don't get it. :D As it is part of the inner wall/shell I wouldn't wanna have contact with the outer one! What am I missing? In my hurry before I missed that you do not build with RC or similar but a double studwall.(?) So the "not touching" and filling with acoutic caulk maybe is not that important than when building on RC.

your drawing isn't too clear to me, but i'm pretty sure you DON'T want the connections circled in red. you will still have a double wall between the two rooms (if i read your sketch correctly). it looks like the room on the left has a single wall construction, and the room on the right is double wall? the double wall should not be coupled together at any point. if you have stability concerns, use some kind of resilient sway braces or something.

I agree with Dan. Copyingly: Andre

Hi Dan, others Hope this picture is clearer. The red lines are my layers of plasterboard. I have circled my area of concern. I was planning to have a double layer on each wall between the rooms to stop drums but if the rest of the live room only has a single layer am I wasting my time somewhat. Any comments appreciated

yes, you clearly do not want to connect the inner leaf to the outer leaf at the circled spots (or anywhere). this would be bad. and you are right, you are pretty much wasting your time with your plan to do 2 layers on part and one layer on another part of the leaf. the one leaf part will override any benefit the 2 leaf part provides. if you have 2 noise sources that are 50 db, lowering one of those sources makes hardly any difference in the amount of noise heard. it is still basically 50 db that is heard.

I still agree with Dan. :) Andre

I wrote:

the one leaf part will override any benefit the 2 leaf part provides.

oops, that should be "layer," not "leaf." I hope you still agree with me Andre :)

Thanks Guys, I suppose I can always make the left control room wall a triple layer of plasterboard - I suppose I will just keep adding plasterboard to it untill it does what I want it to!! Thanks JohnG