Green self-adhesive w/mylar covering other side- 1/8" thick 3" wide 100ft Roll
How to "Stagger-Stud" and soundproof existing stud walls using Sound Isolation Padding Tape: Assuming the wallboard has been removed and the studs are exposed- Apply 2 layers of the green 1/8"X1-7/16" tape to every other stud. This will build out the stud by about a 1/4". The tape has a peel-off backing and may be cut with scissors. Place your wall panels over the studs and fasten them only to the studs which have the tape. If the other wall is open do this to it also, alternating the studs, that is, do not apply tape to studs which have tape on them already on the other side.
This system breaks the sound path through the studding and is very effective and inexpensive for reducing sound transfer through the wall. If you don't do anything else, do this! It can double the sound reduction of your wall, especially at speech frequencies.
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