We rebuilt/added to an existing wall in our conference room. Removed existing drywall on one side, built another 2x4 wall 1/2" away from existing wall. Filled both walls with batt insulation. One layer of 5/8" drywall on new wall glued with Green Glue, then another layer of 5/8" drywall perpendicular to first drywall, with Green Glue in between. WOW. cant hear anything between the rooms at all. Good info too for sound proofing if you google green glue.
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