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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
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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
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1 Answer

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. Also you could use packaging foam - which may be free. If using foam you might have to staple a plastic sheeting -$10 -(also helps) on wall to keep foam in place while drywalling. 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
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