As mentioned we are going for the maximum sound isolation design, (within reason).
The room is located in the basement. The left and rear walls are against the foundation, the front is adjacent to a unfinished storage room, and the right wall is to-be built.
The plan is to incorporate the following design aspects:
--Room w/in room design. No part of the room will touch the house except for the concrete floor.
--3 layers of drywall in the room, (walls and ceiling), with 2 tubes of Greenglue between each layer.
--2 layers of drywall on walls outside the room, excluding foundation walls
--HVAC will be tied to the existing house, but acoustic flexible ducts will be used to avoid sound transmission. I originally wanted to go to a mini-split system, but both performance and cost considerations deterred me.
--Equipment will be external to the room.
--Communicating doors will be installed.
--Stage filled with 2500 lbs. will be used
--False screen wall
--Two level riser
Here is a simple diagram of the room I used for design discussion purposes with my builder, it is not to scale, nor does it represent the exact shape of the room.
Here is a chicken scratch actual layout of the old room:
Note that the room is a bit of an odd shape, which is due to the odd shape of the foundation. Though this area is only about 25-30% of the basement area, it was really my best choice due to the fact that the stairs are located right in the middle.
The ceilings are 9’, but there are two large trunks running through the room (outflow and return) that feed both the basement and main floor of the house. Re-engineering these would have been cost prohibitive, so I am stuck dealing with them as part of the design.