Actually I have nothing but great respect for Gary Anderson but in
this case he is wrong.
Foil works as a radiative reflector of heat. If you glue it face down
on the metal floorpan, you will be negating any reflective value of
the foil - you will simply be attaching the foil to the floor and
adding the foil mass to the floor pan's conduction of heat. FYI I'm a
Mechanical Engineer and heat transfer is something we study a great
deal in university.
If you are installing the dynamat inside the car, you should have the
foil side up - it will act as the final radiative reflective barrier
because of the air in the closed cell foam in Dynamat and dynamat's
non conductive properties, in effect reflecting the heat back through
the foam and through the floor pan.
The best way to attach the dynamat will be one of two ways:
1) Inside the cockpit - foil side up
2) Even better - attach it underneath the floor pan with foil side
down - this will help prevent your floor pan from getting hot in the
On Nov 10, 2007 12:03 PM, Mark and Kathy <firstname.lastname@example.org> wrote:
> Gary Anderson had a nice article in the Moss Motor Mag. this latest issue and
> brought up some great tips and ideas on insulating our Healeys. One question
> that comes to my mind is the installation of the Dynamat products.
> I believe that Gary was referring to the non adhesive backed Dynamat and
> suggested applying glue to the foil side and gluing it to the floor to help
> reflect heat away from the cockpit and this makes complete sense.
> But what about the Dynamat Extreme that goes on with the foil side up and the
> tar surface down. Isn't this product defeating the purpose of reflecting the
> heat away from the cockpit?
> What would the use of the foil backing be in this case?
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