Originally Posted by Digital_Chris
Since two of my walls are against concrete, do they or should they be DD/GG/CC or can I just do one layer of drywall? The screen wall, double dw and channels or just drywall? The ceiling for sure will get the DD/GG/CC because that leads right to the kitchen, but, if I don't do the same on all of the walls, will the sound travel through the framing and into the upstairs enough to make me wish I did DD/GG/CC on ALL walls? I'm just trying to stop the sound from going upstairs as much as possible while being reasonable. I don't need it to be 100% quiet either, I just want to make sure I'm spending my time and money in the right places here.
Hope to hear some good input soon, I need to get my inspector over here soon to sign off on the framing, then I can start wiring
I was in your situation when I started my build, weighing what I should do for isolation. Scrimp and save, or do it right and know that it will be all I could do. Anything less than recommended techniques is going to be a crap shoot on end results. So, following is what I understand as gold standard for you, anything less and YMM definitely V:
1) For your 2 walls against concrete, use standard stick frame construction. No need for clips and channel as they are considered DECOUPLED due to concrete walls next to them. DISCONNECT them from upper framing via use of DC-04 clips. DD/GG on interior.
2) For your 2 interior walls, most cost effective method is using staggered stud construction, or building second interior wall, which DECOUPLES from opposite side. Same deal as #1 applies with use of DC-04's for DISCONNECTING from upper joists. DD/GG on interior. This approach is much less $ than doing a single standard wall construction and then doing clips/channel.
3) Ceiling normally is clips/channel/DD/GG if attaching to existing joists. If you are doing floating joists, then just DD/GG will do.
Sealing wall outlets and other penetrations are important as well and have recommended approaches.
I went the extra mile and am very happy with the results. Since every room is different in terms of location, flanking paths etc. it would be nearly impossible for someone to tell you you'll get X results based on your particular situation, testing isn't there. I came to that conclusion pretty quickly, and decided on the max since I needed it for my build.
Hope that helps.