I live in a duplex with very loud neighbors, talking loud and partying, I would like to insulate the wall for the least amount of trouble, and money if possible.Thanks
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It is not as good as fiberglass batts because it tends to settle and have voidsI assume that you are trying to find a product that you could pour, (or blow), down between the walls from the attic and the blown in option is probably your best betYou could also look at vermiculite type insulation which would be poured in but likely more expensiveEither one you use will make a big difference if you currently have a double wall with no insulation at allMost contractors would have used batts in the studs of each wall to control soundIf that's the case with your wall then simply filling the remaining space between the walls will likely not yield much further improvement.
