It has been discussed a bit.
In your design you no longer have the studs connecting
the two sides of the wall. You do have the top and
bottom plates connecting the two walls.
In some situations this will be worse than an normal
single stud wall. What you have created here is a
large resonant chamber with relatively low density
diaphrams on each side.
The two walls in a staggered stud design should have
separate top and bottom plates. Rafters for the ceiling
should not span the two top plates. Ideally the two
bottom plates should sit on seperate and isolated concrete
pads.
In truth you will get some extra sound attenuation from
the 2x6 common plate design you suggested. But it probably
won't be much more than adding an extra layer of 5/8"
firerock to a standard 2x4 wall.
Cheers,
Kelley Mascher (206) 528-2713
Children's Hospital & Med. Center mascher@u.washington.edu
Audiology Research Seattle, Washington USA
On Thu, 18 Mar 1999, Joe Flake wrote:
> Date: Thu, 18 Mar 1999 12:26:38 -0500 (EST)
> From: Joe Flake <flake@a3115jmf.atl.hp.com>
> To: shop-talk@autox.team.net
> Subject: Re: Compressor sound
>
>
> >
> > My neighbour is a sound abatement engineer. He tells me that each layer
> > of 1/2 " sheet rock abates the sound by 3db (cuts it in half). So if one
>
> I haven't seen it mentioned here, but I understand that a big trick to
> doing a sound proof/reduced wall is to use offset studs.
>
> Use a 2x6 for the top and bottom pieces, then offset every other
> 2x4 stud to the opposite surface. That way you don't have the
> 2x4s conducting sound from inner to outer walls.
>
> In ascii art (looking from the top)
>
> ==================== sheetrock
> | | | | | inner 2x4s
> | | | | | | | | | |
> | | | | | outer 2x4s
> ==================== sheetrock
>
> Stuff it with fiberglass if you like, but I don't think it does
> much good for sound (not dense enough).
>
> Joe
> flake@a3115jmf.atl.hp.com
>
>
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