Hi, Mike. Homasoat Corporation makes a product for this. Check it out at www.homasoat.com and I believe that the product name is soundasoat. I have not used this but I have used regular Homasoat for noise reduction. The way I went was to remove the old drywall, install homasoat vertically as you would drywall, install drywall horizontally, then tape, mud and prime the new drywall as you normally would. You might ask at their site if they have a better way as they will probably have to direct you to a source.