Any ideas why my green glue setup didn't work?

Did you decouple the drywall from the studs?

Fill the space between the studs with insulation?

So, you just added a second layer of drywall with GreenGlue on it to the existing right? If you didn't take off the crown molding then where did you stop the second layer of drywall at? Did you take off the base molding? How much GreenGlue (# of tubes) did you apply to each sheet?

If the stud bays are hollow (no insulation) it can act like a drum and amplify the sounds.

Ideally, you want to decouple both drywall layers from the studs if you can (with the green glue between the layers). This will help keep the vibrations from transferring directly from the studs through the drywall. The green glue helps dampen things further.

http://www.soundproofingcompany.com/...or_noise_walls

I'm sure your vendor was pleased to accept your money. This is a building supply house with, I suspect, little to no actual credentials in the science behind sound isolation. Perhaps a good place for materials...but; not necessarily your best place for advice.

You have two large flanking paths which were not addressed ... the floor and it's common structure between units, and the ceiling.

A question: What did you do with HVAC vents, outlets, and light switches on the wall you upgraded with Green Glue?

Acoustical caulk doesn't do much for that hole. None-the-less, your problem is not going to be solved by the wall. There is vibrational energy in the structure flanking to the floor, ceiling, and other walls.

If the wall is vibrating, and you installed the correct amount of green glue, it is working, the problem is that wall was only a part of the solution. It's unfortunate the expectations given you by the vendor didn't meet reality.

Part one of the problem is you didn't measure the before so you cannot tell if there is any improvement in the after. I have no doubt the green glue is doing exactly what it is supposed to be doing. Part two is the advice you were given was faulty at worst and incomplete at best.

Very, very few places that sell sound isolation materials have a clue about sound isolation. It is non-intuitive and complex. The places which can afford to have the knowledge base on staff are far and few between. Ted (www.soundproofingcompany.com) is one of those with the knowedge base.

It may not be fully cured, but cured enough to be providing benefit. You need a fully engineered solution (which may turn out to be expensive) or a heart to heart with your neighbor.

What thickness drywall did you use?

Because with removing the crown molding, a second layer of 5/8" should have garnered a decent improvment I would of thought.

I mean, I have done just two layers of drywall only in many theaters and it's always been a decent improvemet overall, all on it's own.

lets also not look past the elephant in the room. someone who installs a second layer of drywall between the existing baseboard and crown, has a significant lack of home building/repairing knowledge and is unlikely to *properly* apply and use any of the available decoupling impliments.

no offense op, but chalk this up as a learning experience. it is likely you wont be able to get your solution unless your neighboor agrees to let you rip into his side of the wall too.

take home message is dont share walls with people, its always cheaper to move out than to soundproof!

Sorry, but I don't have any helpful advice. But I just wonder what goes on in the minds of people who live in such close quarters to their neighbors that it's okay to play their music/tv so loud. And drums...seriously??

Ever thought about taking up the tuba?

LOL

Some people just enjoy being @$$holes, and feel being considerate is for "pansies"

Have you tried strangulating or kicking the heck out of your neighbor? If that is not your thing, move...

You really should of just spent the extra money and decouple your wall. I just got done doing one of my walls that is connected to my neighbor in my town home. Its only been 2 weeks but the wall sounds far from hollow. Sound really solid like a concrete wall. I took down the wall and filled it with r-13 insulation then decoupled with whisper clips and hat channels. The added 1 layer of 5/8 plywood,2 layers of 5/8 drywall with green glue between sheets.. I also added 1 layer of 5/8 drywall with green glue on the ceiling. I wasnt able to do the floors and side walls but Ted and John from soundproofingcompany.com sure helped me out through every step of the way and they told me this should give me a huge improvement. My Home theater room is almost done so I will be able to test out the surround sound in a few weeks and hopefully wont be getting no complaints from our neighbor..

I just wish I could go decouple the wall on my neighbors side and add some drywall and GG..

You might want to just try and take down your wall and decouple. Maybe you can talk to your neighbor and get hime to decouple his wall aslo or add some drywall with green glue..

ed a7-900.... i mean best way to fight fire is with fire right?

Oh yeah... that should definitely do it...