For new build or remodel of your common walls, to isolate on rooms noise from the next, a popular building technique is a “staggered stud” wall assembly.   The floor plate is 6″ wide, but the vertical studs are standard 2x4s, which allows the builder to alternate their installation as shown here.  The concept is to disconnect the rooms by formatting the studs so they alternative but not connect the rooms together.   This will force the collapse of the vibration, much like cutting a string pulled tight between two coffee cans.   The dB-Bloc barrier membrane then decouples the vibration with density, and the wall upgrades to luxury grade STC ratings on average of 55-60 or greater.   Results will vary based on leakage.  For more information on building your staggered stud common wall, call NetWell Noise Control at 1-800-638-9355.