[Cob] Soundproofing on a traditionally built wall

[Buckaroo Bonzai]

Ed,
  thanks for information on your projects.  Yes earth
is a great insulator for sound.   Malcolm Wells once
built an underground office next to a busy highway and
was very pleased at the quietness in his office, due
to the being underground where the sound waves didn't
travel so far as in open air..


--- Raduazo at aol.com wrote:
> I do not know if this would help, but I just did a
> cob wall over bamboo lath. 
> Bamboo was split with a conventional 5-way splitter
> and applied to a 
> conventional stud wall using "horse shoe nails."
> (That is the U-shaped nails sometimes 
> used for attaching fabric or wire to a wall.)
>     This was then covered with a layer of cob pushed
> through the openings in 
> the lath, followed by a layer of straw/clay plaster,
> a layer of horse 
> manure/clay plaster and a final lime plaster.
>     The resulting wall is much more massive than a
> conventional drywall 
> surface. I think it is important that the inner
> layer of the wall has a different 
> harmonic frequency than the outer wall. Plus I have
> conventional insulation 
> between the walls.
>     I did not do enough of this to determine if it
> was of any acoustical 
> significance, but it should cut sound, and the wall
> cost less than $1.00 since the 
> bamboo, the clay, the straw and the sand were all
> free. I am still on my 
> first bag of lime for a 10 x 9 foot cob wall and a 3
> x 9 foot bamboo lath. The 
> store bought lime is the only ingredient that cost
> money.
> Ed
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