I'm in the midst of designing my basement studio, and I've run into a big question concerning how to seal off the space. I am planning my space into an unfinished basement. My goal is to buildout a single recording/mix room - one big finished space. However, I will be leaving the other half of the basement unfinished (for laundry, furnace, etc.)
My question is...if you are only finishing half the space, but are planning on doing double walls for the interior wall, won't sound just leak up above the double wall where all the joists meet the studs? Doesn't this render the double wall useless?
Also, I'm unsure of how to connect the double wall to the foundation. As far as code goes, I believe I have to keep all framing 6" away from the foundation. This would be another leakage point.
I would guess that there is a solution here. Maybe framing out between the joists and running drywall up there as well? Perhaps there is a better solution?
I included an overhead screen shot from my sketchup file.
double wall leakage
Originally posted at johnlsayers.com, topic 19594.
Hi. Please read the forum rules for posting (click here). You seem to be missing a couple of things! :)
Regarding your question: "if you are only finishing half the space, but are planning on doing double walls for the interior wall, won't sound just leak up above the double wall where all the joists meet the studs? ". You build a complete shell, not just walls! The "room-in-a-room" concept is exactly what it says: A complete room built inside the existing room, and that includes the walls AND the ceiling. This is often called "fully-decoupled 2-leaf MSM isolation". So you have your existing walls, then you put up four new walls inside them, but not touching. Then you add a ceiling on top of those new walls, just below the existing joists but not touching them.
Why? That sounds strange: How could you build interior walls if they can't meet the foundation walls? Better check that. If it turns out to be true, then you'll have to build a three-leaf room, which is rather different - Stuart -I believe I have to keep all framing 6" away from the foundation.