I had a contractor install a soundproof wall over my existing bedroom wall and he did a good job, but charged a ton of money for work. He did a crappy job in the closet and I can hear everything the next door neighbor is saying and it drives my crazy. The contractor put an extra layer of sheetrock over the existing closet wall and it did absolutely nothing. He the plastered it and it looks fine but doesn't work. Are there some materials I can buy myself to soundproof the closet, without getting another contractor in to do the job?
Thanks,
Lisa