Barry, in most cases the alum. adds a reflective heat surface to the
Dynamat Extreme, depending on how the material is installed in the car. In
most cases the alum side is installed away from the heat factor(floors) in
our cars so that sort of cancels the reflective idea. However it also adds
a smooth non tacky side to the Dynamat Extreme so carpet and other items
don't stick to it when hot. And of course there is the noise insulating
characteristic that Dyn Ext. and your product add. That characteristic
should be about the same between the 2 products, IMHO.
I used the Dyn. Ext. and notice a huge sound deadening effect especially
when you add the carpet pad and the carpet over the D. E. Very pleasing
effect.
As for the tar paper, that is just for originality. That was all they add
back in the early car days so that was used on the floors and firewall.
Seems
like very little R value there to me.
My 2 cents, Mark
----- Original Message -----
From: "Barrie Robinson" <barrie at look.ca>
To: "john spaur" <jmsdarch at sbcglobal.net>; "I Erbs" <eyera3 at gmail.com>
Cc: <healeys at autox.team.net>
Sent: Wednesday, May 25, 2011 3:50 PM
Subject: Re: [Healeys] question about interior firewall
>I am not sure why tar paper. The stuff I get from the roofing
> people, which is exactly the same as Dynamat but $1.30 against $11
> per sqft. has an aluminium foil topside. If I am missing something
> please let me know - but why tar paper I want to know.
>
>
> At 09:39 PM 5/24/2011, john spaur wrote:
>>Put them in afterwards or be very careful when spreading the glue.
>>BTW, David Nock applies Dynamat under the tar paper. I just applied
>>the tar paper.
>>
>>John
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