I've read through mostly positive reviews for the past 45 pages. There are a few dissenters though. Me being one of them. Sorry. There are some controversial opinions of Green Glue and its cost effectiveness as been discussed heavily on other sites. I won't list them here, but its very easy to find with a google or yahoo search.
Here's my gripe. I'll sugarcaot as much as possible my beef because I am not an expert at all in soundproofing. So full disclosure here. I've only had a very limited experience with this stuff helping a friend do his home theatre living room construction, and I also ordered a case of this stuff and started using it on a very limited basis a few days ago.
1 - My opinion is no to green glue as a decoupling agent between framing studs and drywall...
For starters, the stuff is really messy. Using it on the studs and getting good coverage before the first layer of drywall goes on is disastrous. Firstly, even if you are double drywalling, so you don't waste a bunch of green glue, the first squeeze and application should go directly to the studs and THAT is where it gets messy. If you are not careful the stuff slides down and gets on the floors all over. After you put the stuff on the studs, you then put the drywall up. I suppose you could go with the traditional build a stud cavity (room) within a stud cavity (room), but using up that much space is just not an option for many homes. And yes, I suppose you could use clips and channels to decouple the first drywall layer from the wall, but sometimes that is a limited option too because of issues with doors, plumbing, etc.. So, if you want to use the green glue as sort of a chemical way to decouple the first drywall layer from the studs, well my opinion is that it is a messy disaster. Plus, if you do some google searches, I have read that green glue as a decoupler between stud and drywall is really not that great. Like, as in, no difference at all.
2 - My opinion on green glue as a decoupling agent between sheets of drywall is a maybe, or maybe not.
OK. I admit that use of some sort of chemical agent, whether it bonds or not, between two layers of drywall would have much more significant benefit than use of green glue between stud and drywall. Why? Simply because of the sheer amount of surface area of putting that green glue stuff between drywall is so much greater than green glue on just the studs. And putting it on the studs is in my opinion a mess and a waste of money. What I have read is that green glue isn't even glue. It is very viscous (i.e. liquidy without it being total liquid). Well, who gives a hoot if it is a little bit more liquid than plain old silicone? The idea is that its use is as a decoupling agent. All the magic about it converting sound energy to heat or whatever is true for plain old silicone also. I mean, it might be arguable that green glue might offer about a big improvement over not using anything as a decoupling agent. But here's the kicker. If it is only like 2% better than using regular old plain silicone (not glue) between sheets of drywall, then why would anyone want to pay 200% more for very little gains over something that you can already buy cheaply at the hardware store (silicone caulk). I mean, come on. There were music studios doing soundproofing way before these specialized products came about and I'm sure that silicone worked fine then. Why would silicone caulk not work now between drywall sheets? Green glue isn't even glue! Silicone is cheaper. So what, silicone is a tad more viscous. Big deal.
Last edited by bobsled34; 10-06-2014 at 10:36 AM.