Soundproofing a wall is one of the easiest soundproofing projects out there. If you are willing to remove the existing drywall and start from scratch, your chances of getting great soundproofing increase exponentially.
To soundproof, you would remove your existing drywall to expose the studs behind the drywall. At this point you would add batts of insulation into the stud cavities. Two of the best soundproof insulations are Rock Wool and Ultra Touch cotton insulation. These insulation batts can be purchased from a local insulation or drywall supply warehouse. We at Soundproofing America also carry these products and can have them delivered right to your door.
The next step would be to purchase rolls of Mass Loaded Vinyl Sound Barrier or (MLV for short). The MLV will be stapled or nailed directly to the wood studs using an industrial air drive stapler or nail gun. The MLV will cover the entire wall much like a soundproof membrane. It is best to overlap the seams as you cover the entire wall surface of the studs with the MLV. Once the MLV is installed, you will want to caulk and tape the overlap as well as the perimeter of the vinyl membrane. Now that the MLV is sealed it is time to install a new layer of 5/8” drywall. Get a good quality drywall like National or US Gypsum. With the drywall installed you can tape the seams and texture it to suit your taste. That’s one of the best ways to soundproof any demising wall.
There are other methods available for wall soundproofing which include using a sound damping compound such as Green Glue which is applied between layers of drywall if you don’t want to demo your exist drywall. Another method is to create a “floated” wall assembly with sound isolation clips and furring channel. A third method is to add a engineered sound drywall such as our SoundBreak XP Drywall available in ½” and 5/8” varieties.