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I searched the forum and found a few posts on party wall soundproofing, but I’m looking for more specific advice, and I would really like to hear from people who did this.

After we moved into our house, we realized that one of our party walls sounded surprisingly thin. We can hear music, TV, conversations, vacuum cleaner, etc. The neighbors are not particularly loud, and what we can hear appears to be a fairly normal noise level (and they can probably hear us). The wall is brick covered by the original plaster. I was surprised that brick and plaster could transmit so much noise, but it does. I’ve read on soundproofing and I’m getting familiar with the basic concepts (mass and standoff) and with the materials. But the more I read, the more I realize that there is no easy and perfect solution.

I’d like to hear from people who soundproofed their party walls. What did you use and what results did you get?

And where in Brooklyn or NYC can I find soundprooking materials? I was at Lowes and Home Depot recently. When I asked them about soundproofing materials they only had Homasote 440. They had never heard of Quietrock and Green Glue. I was suprised since I thought these thing would be in high demand in NYC.

thanks in advance!