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Question: Is blown in insulation good as a sound proof insulation for a duplex wall?

Question by marie h: Is blown in insulation good as a sound proof insulation for a duplex wall?
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

Best answer:

Answer by websterbackhoe
i would recommend blown in insulation as well as a seperation of the walls, you see the sound is being transferred through the 2×4 and the speaker is the wall board.
if you have the room, install another wall not touching but close to the existing wall using 2x3s.and insulate that wall as well.

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One Response to Question: Is blown in insulation good as a sound proof insulation for a duplex wall?

  1. Don S

    It is not as good as fiberglass batts because it tends to settle and have voids. I 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 bet. You could also look at vermiculite type insulation which would be poured in but likely more expensive. Either one you use will make a big difference if you currently have a double wall with no insulation at all. Most contractors would have used batts in the studs of each wall to control sound. If that’s the case with your wall then simply filling the remaining space between the walls will likely not yield much further improvement.

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