re: Noise reduction from inside to outside the shop…

Thanks for the input. I’ve looked at staggered studs, but it appears 25g steel studs at 24oc is even better and cheaper. Since it’s non-load bearing, it doesn’t matter. Then rockwool, then resilience channels and prob 5/8” drywall. This is just for the compressor/DC cabinet. The rest of the walls I’ll prob just do with fiberglass and resilience channels, then 1/2” drywall to close them off. I’m thinking rockwool and 5/8” for the ceiling, also on resilience channels. 

The problem with decoupling using resilience channels (which, by all accounts is arguably the largest vibration based sound reducer)is it means you can’t hang things off the walls…unless you back it with 1/2” ply first I suppose. 

I’ve got time. Still collecting info.