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I did a layer of tecsound followed by acoustic plasterboard with acoustic sealant against a wall in a small kitchen that backs onto a common stairwell. It made a difference but it's not brilliant. Done lots of googling on this and seems you definitely need to separate the new wall from the existing, ideally with an independent frame, leave a small air gap then fill void with rockwool, then plasterboard, ideally mounted on resilient bars or other clips. I couldn't afford to lose that kind of space. Don't regret doing just tecsound and plasterboard but without a gap to absorb sound and break chain of vibrations you'll not see a huge difference
TommyRides
Does anyone have any experience with acoustic plasterboard/other products that would help soundproof a party wall? Looking for recommendations for what to buy! Thanks