Use of foam as insulator?

[ggehrke at gmail.com (GGehrke)]

You might try dynamat, too, if your primary concern is noise.  It's
heavy and expensive, but a little bit goes a long way.  A friend of
mine used it in his E30 BMW with good results.  The nice thing is that
you don't actually have to seal anything, unlike truck bed liners and
rubberized paint (or the gorrila snot tar thats stock in a Scirocco).
Just putting it on a panel will dampen the vibrations and keep the
sheet of metal from acting like a speaker.  Dynamat dealers sometimes
have a demo that they do in the stores where they put a tiny piece on
a bell and it makes it nearly silent.  You can get knockoff stuff on
eBay too, which IIRC is what my friend used.  I used bits of his on
the back of my license plate and actually stuck bits on an old
computer case and on hard drives to quiet things down.

-Grant-



On Nov 8, 2007 1:53 PM,  <julie@xxxxxxxxxxxxxxxxxx> wrote:
> I stated to think about it when I was behind the rear PS panel. Man thats a HUGE space.
> The car is really loud inside, I was hoping to reduce that a bit. First I'll try the truck bed liner on the floors under the carpets, then think of other things.
> Thanks!
>
> >-----Original Message-----
> >From: Brian Haygood [mailto:brianhaygood@xxxxxxxxx]
> >Sent: Thursday, November 8, 2007 12:48 PM
> >To: 'Scirocco list'
> >Subject: Re: Use of foam as insulator?
> >
> >I always figured that foaming things other than rocker panels was
> >probably OK, because the rocker panels might be the only ones that see
> >a significant amount of water. Just a guess, really. I have heard of
> >rusted out rocker panels due to foam.
> >
> >On Nov 8, 2007 9:41 AM, Jim Ruffi <jimruffi@xxxxxxxxx> wrote:
> >> My suggestion would be a thorough coating of rubberized undercoating to the inside of those panels. The rubber coated metal won't be exposed to moisture and you can still shoot the foam in for additional reduction. The challenge will be getting a good spray into channels and such.
> >>
> >>
> >> >-----Original Message-----
> >> >From: Dan Bubb [mailto:jdbubb@xxxxxxxxxxx]
> >> >Sent: Thursday, November 08, 2007 10:26 AM
> >> >To: julie@xxxxxxxxxxxxxxxxxx; A Org, Scirocco
> >> >Subject: Re: Use of foam as insulator?
> >> >
> >> >
> >> >Yep. I think its primary purpose is to stiffen the chassis.
> >> >My main concern is if the foam will hold water and cause rust. Of
> >> >if it will simply maintain water between the foam and surrounding
> >> >sheet metal and cause rust.
> >> >Water does get into these areas so it sounds like an iffy idea to me.
> >> >Dan
> >> >
> >> >From: <julie@xxxxxxxxxxxxxxxxxx>
> >> >To: "A Org, Scirocco" <scirocco-l@xxxxxxxxxxxx>
> >> >Sent: Thursday, November 08, 2007 10:08 AM
> >> >Subject: Use of foam as insulator?
> >> >
> >> >
> >> >>I remember a long time ago a discussion of using the expanding
> >> >foam to fill the voids in a car to reduce sound and heat.
> >> >>
> >> >> Any body remember this?
> >> >>
> >> >>
> >>
> >>
>
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