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My bedroom is next to the kitchen on one wall, a hallway on one wall, the outdoors on one wall and the PC room on the other. The wall that bothers us the most is the kitchen wall.

We would like to soundproof the kitchen wall and maybe the hallway wall.

Is that possible without it costing a fortune?

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What's on both sides of the kitchen wall? Is it shower/cupboards? – Chris Cudmore Apr 23 '13 at 13:36
It sounds like you want to soundproof your bedroom walls. At any rate, check out QuiteRock and Green Glue. – oscilatingcretin May 24 '13 at 8:12

Not sure what a fortune is and how much you are willing to do yourself.

  • demo drywall on walls - free
  • buy Quiet Batt insulation - $2 a foot or cheaper- pack the wall cavity to the max with insulation. If you want cheaper insulation I think rock wool is your best bet. And I would sandwich it in.
  • Redrywall. OK - Here is the big expense. Quietrock (Lowes) works well. It is $40-50 a sheet so that might set you back $300. You could also double drywall - more work but less material cost.

  • Mud and tape - don't know of any mud and tape that is designed for soundproofing.

  • There is soundproofing paint. It helps but I am not sure how well you would notice a difference when the sounds are coming from so close. This would be another $100.

  • There are soundproofing grids you can buy for your wall - some with ok designs. These are really expensive and really out of the realm of your question.

So if you can do everything yourself you are looking at $200-600. Another $150-200 to have someone do it for you. Also if there are drain pipes in the walls then you will never get the full effect of the soundproofing since the 3 inches of material will probably be reduced to 1 inch or less.

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It is doubtful packaging foam in general would meet fire retardancy requirements. Styrofoam peanuts are highly flammable. Biodegradable peanuts may be a vermin food source, at best. Stick to approved insulation in walls (or on). – HerrBag Apr 23 '13 at 23:26
I edited answer based on not knowing the name of the packaging foam. It is the egg carton foam not the peanut balls or the rigid foam. It is fire retardant and is chopped and used for recycled insulation solutions for attics. – DMoore Apr 24 '13 at 4:27
What is "demo drywall on walls"? If you mean demolish or demolition, then how would getting rid of drywall help with sound insulation? – user29020 Sep 23 '14 at 23:23
@user29020: You have to remove the wall's surface before you can pack the wall with insulation. ALSO, if you're serious about this, you want to add a second set of offset studs so there isn't direct coupling from wall to wall through the studs; again, that can't be done without demolishing at least one wall surface... or losing space in the rooms to put up a secondary wall. – keshlam Sep 24 '14 at 1:23
BTW, one sound-studio approach starts with offset studs supporting the two layers of plasterboard with minimal coupling between them to stop the low frequencies, then fills the wall with sand to stop the high frequencies. Probably not something you want to do in a typical house except in walls resting directly on a concrete slab; that's a considerable amount of weight. And it's a pain if you ever need to work on that wall in the future. – keshlam Sep 24 '14 at 2:28

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