selfintroduction + drywall setup question

[Joa_G]

first of all i have to mention that i was very happy to discover this wonderful forum.


I am in the process of planning a studio with two control rooms and one recording room.
I am located in Berlin Germany, so i will try to convert from metric to ft dimensions...and sorry for my bad english...

at the moment all my thoughts ar focused on the recording room.
main purpose will be recording of drumset/classical timpani/percussion and guitars.
isolation should be as good as possible (neighbours above/control rooms should be isolated from recording room)
the existing structure is not too bad concerning sound isolation (former industrial building):
the green walls in the plan are not installed yet, all others are fixed and can not be removed.
dimensions of the recording room are h/l/w 11ft / 19ft / 21,5ft or 3,4m/5,8m/6,6m

existing walls are brick walls, 1,25ft or 38cm thick without any windows
floor and ceiling are concrete and also about 38cm thick.

there exists an opening in one wall only, where i want to install the door. it is 9,0 ft high and 9,8ft wide so it has to be reduced to
normal door dimensions (6,8ft*3ft). (the wall with the ? in the floor-plan)

i plan to build a floating floor construction with floating walls and a ceiling on top without any contact to existing walls and ceiling
(already drawn in the plan)
i will follow the mass-spring-mass-rule with the existing walls, floors and ceilings as outer mass-leafs and a metal stud setup with rockwool
in between and double layer gypsumboard on the inner side as inner leaf.(see D04 wall detail)

at the moment i am calculating the total weight of this floating construction (incl. interior) to be able to find the right floor-spring material . any suggestions concerning this are welcome !

my (first ) question I wanted to ask all the experts in this forum concerns the mentioned existing wall-opening

I plan to use a double door configuration, one in the independent floating room and one in the drywall-closed wall opening.

which drywall setup for the opening should be used?

i would use an independent double metal stud with double layer gypsum board on the outer sides of the studs with rockwool in between.
but with that setup i will have a three leaf system or mass-spring-mass-spring-mass system in the area of the wall opening which probably performs worse...
should i better try to leave the middle stud wall away
or is the best solution to fill the opening with a brickwall?

thanks,
joachim

[len-morgan]

Just out of curiosity, why TWO control rooms?

[Joa_G]

The recording room is shared between two independent producers, the expression "control room" i used in my posting tells not the whole story, the two rooms are used for many purposes, like composing, sound design, mastering etc. live recording is just a small part of our daily work.

Joachim

[Joa_G]

For a better illustration of the above floorplan i made a 3d view...

Joa

[knightfly]

If isolation is at all critical, you'll need to make that wall solid or at least remove its inner leaf for a wide air gap between 2 leaves... Steve

[Joa_G]

Thanks, Steve for your answer. Just to be shure: you mean it is better to remove the middle leaf, like you can see it on the 3D view (in contrast to the floorplan)?. I learned yesterday that the owner of the building does not allow additional solid walls, so i have to use drywalls....

joa

[knightfly]

Right; mass, air(insulation), mass. Nothing more, nothing less... Steve