<VV> CAUTION / sound and heat insulation/passenger compartment

[Mark Corbin]

Back in the '70's I did some R&D heat and sound lab tests on a city bus,
testing various types of insulation for the rear seatee (the most rearward
seat, mounted over the engine and against the back wall). The type of
insulation that proved most effective was the common cotton/jute batting
pad like what is found under the carpet or against the firewall in many
cars. It was better than styrafoam, aluminum lined, or several other
proposed types we were considering. It was stuff we'd been using for ages,
so we stuck with it.

Some times, what's in use now is still the best. Personally, I would not
only be wary of anything that would  absorb (like open-cell foam) and hold
moisture, but also anything that would not breath (like any kind of rubber
or metallic sheeting) and thus trap moisture under it. Sheet cotton/jute
batting does neither, so I'd recommend sticking with it.

-Mark

> [Original Message]
> From: Mark Durham <62vair at gmail.com>
> To: Louis Armer <carmerjr at mindspring.com>
> Cc: <virtualvairs at corvair.org>
> Date: 9/10/2010 12:11:00 PM
> Subject: Re: <VV> CAUTION / sound and heat insulation/passenger
compartment
>
> Gents, I didn't get over to Home Depot but did find this self adhesive
butyl
> foil backed sound deadening material designed for automotive use on
> Amazon.com.
>
> The Butyl material will not hold moisture.
>
>
http://www.amazon.com/dp/B0007P2R2C/?tag=googhydr-20&hvadid=3979120721&ref=p
d_sl_41u2wzrdzz_b
>
> Not a bad price, either. About $1 a sq foot. Comes in 40 or 60 sq ft
rolls.
>
> There is also some 1/4 inch closed cell sound deadening moisture resistent
> foam for sale on amazon, which came up below this product in the above
> hyperlink.
>
> Mark Durham
>
> On Mon, Sep 6, 2010 at 7:59 PM, Mark Durham <62vair at gmail.com> wrote:
>
> > Thanks Chuck, that makes perfect sense. I don't know what Home Depot
sells,
> > but moisture would be a worry in a house, too. If I have time this week
(I'm
> > on vacation but have a looonnnng list of honey do's), I'll go check it
out
> > and report back. Mark Durham
> >
> >
> >
> > On Mon, Sep 6, 2010 at 9:24 AM, Louis Armer
<carmerjr at mindspring.com>wrote:
> >
> >> You need to make sure that the product you purchase is a closed cell
> >> foam if you use any foam type product ................ otherwise the
> >> horror stories about RUST will be in your "quiet" newly sound proofed
> >> Corvair.
> >>
> >> Chuck Armer
> >> /////////////////////////////////////////////////
> >>
> >>
> >> At 11:56 PM 9/5/2010, you wrote:
> >> >Hank, recently a article on sound reduction, I think on Corvair Forum,
> >> said
> >> >the guy went to Home Depot and bought a foil lined foam insulation
that
> >> is
> >> >self adhesive. He was quite happy with the result and I am thinking of
> >> doing
> >> >the same thing if I can find the product. He said it was a lot
cheaper,
> >> >too.. Mark Durham
> >> >
> >> >  _______________________________________________
> >>
> >> CORSA Member
> >> Corvanatics Member
> >> Corvair Atlanta Director
> >> 1965 Corsa Coupe
> >> 1964 Greenbrier
> >> http://darthvair.com
> >> SECC Member
> >> 1965 Corsa Autocross car 1/2 owner
> >> http://www.wtbrt.com/
> >>
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