Originally Posted by antony
I've proofed the live room with rock wool and 12.5 wallboard. I have extended and want to add to the soundproofing. So im going to put resilent bar and another layer of drywall over the existing drywall. I've read that two layers of wall board are better but at different thickness. Does it matter which thickness sits on the stud or is it same difference.
there is no advantage to using differing thicknesses of drywall - use the thickest you can afford..... this is about mass - 16mm is better than 12mm and is much better than 9mm
There is (however) a huge disadvantage to using resilient channel in between layers of drywall - very highly NOT RECOMMENDED..... if you need to decouple in order for this to work for you - first remove the drywall so you can attach the resilient system directly to the studs.