sound proof material

Discussion in 'General Electronics Chat' started by bug13, Sep 29, 2014.

  1. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
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    Hi guys

    What kind of off the shelf sound proofing material I can easily buy from supermarket or local hardware store? I am looking mainly sound proofing human voice.

    Will cotton works? or foam? I assume I need some sort of foam with the right gap size or something??

    Thanks guys!!
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Home depot, 8ftx3ftx1/2" insulation foam board $7.00.
    or 1" for ~$18.00.
    Smaller? 3/16 " project foam board from art/craft supplies.
    Max.
     
  3. #12

    Expert

    Nov 30, 2010
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    Fiberglass insulation, if you have room for several inches. Cotton will work, but it's flammable and it's hard to get cubic yards of the stuff. Spray foam works, but again, it's flammable.

    As usual, google is your friend.

    http://www.soundproofing.org/

    http://soundproofing101.com/
     
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  4. nsaspook

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    Aug 27, 2009
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  5. quarkelec

    New Member

    Apr 1, 2014
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    Nice topic.
     
  6. alfacliff

    Well-Known Member

    Dec 13, 2013
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    a real cheap sound deadning material, dirt. hollow walls filled with dirt.
     
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  7. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    How much attenuation do you require?
    Where are you going to use this? in a stud wall? on top of a wall? floor?etc...

    Seeing you are from NZ I'd suspect what they have in their "supermarket" or "local hardware store" is quite different from what might be available to me..
    A "supermarket" in the US is where you buy food/milk/bread,etc...
    Bread will work :) for a little while anyways..

    foam eggcrates?
    rubber mats?
    acoustic foam?
    regular fiberglass insulation works wonders too..
     
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  8. sirch2

    Well-Known Member

    Jan 21, 2013
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    Agree with #12, fibreglass insulation or sheep wool
     
  9. Shagas

    Active Member

    May 13, 2013
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    How about rockwool?
     
  10. #12

    Expert

    Nov 30, 2010
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    Rockwool is an older form of fiberglass. Works pretty much the same as fiberglass.
     
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  11. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    Of course, lead sheeting is also great. ;)

    More seriously, if you are trying to sound proof a wall between adjoining rooms, consider whether it is just the air between the two wall faces or do the studs also transmit sound. In other words, a dense stud (supporting structure inside the hollow wall) will communicate sound. In American construction, we commonly use 2X4 studs with drywall or sheet rock on both sides. For better soundproofing, it is recommended to build a 6" wall with alternate 2X4 studs attached to either face. Add fiberglass etc. woven in and out of the studs like a basket to help. That way, the only direct connection between rooms is the floor and ceiling. You do have to consider the ceiling, especially if it is a suspended ceiling.

    John
     
  12. #12

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    Nov 30, 2010
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    It all comes down to, "How much attenuation?"
    Enough guessing. Please give us a number of decibels to get rid of.
     
  13. Lestraveled

    Well-Known Member

    May 19, 2014
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    Back in the "day", we used egg cartons stapled to the wall. Without the eggs of course. A layer of muslin fabric over the top completed it.
     
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  14. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
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    I don't have a number, I am more like playing around and experiencing stuff here. :)

    I am more thinking the hardware section of a supermarket here :)
     
  15. sirch2

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    Jan 21, 2013
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    Some replies on here got me thinking, is there a difference between anechoic and soundproof? Seems to me that the egg box approach is generally used in anechoic (no echo) applications, e.g. recording studio, but may not be the best at sound proofing, i.e. stopping sound coming through a wall.
     
  16. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    The sound proofing foam that looks like egg cartons is sold at a big premium over plain slab foam. The interesting part is that it is so easily made. Drill an array of holes into two sheets of plywood, add 2" dowels to each hole. Compress the foam between the two sheets of dowels, cut while compressed. Instant egg carton.
     
  17. mcgyvr

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    Oct 15, 2009
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    egg crate foam absorbs higher frequencies compared to flat sheet foam.
     
  18. nsaspook

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  19. Stuntman

    Active Member

    Mar 28, 2011
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    Realize they do make a Great Stuff in a fireblock version.

    Walls are generally insulated for sound (as well as temperature) with fiberglass, but realize the wooden studs rigidly anchored between the drywall provide a medium for sound to propagate through.
     
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  20. #12

    Expert

    Nov 30, 2010
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    I have a feeling that, "soundproof" is a misnomer. Maybe somebody, somewhere, has a really dead acoustic space, but for us normal humans it's a matter of attenuation. I made a room that is 51 decibels below the room that is 9 inches away, and I think that was a good accomplishment for the materials available.
     
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