Anyone Using Factory Firewall Insulation In Combination with Dynamat/Thermo-Tec?

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dibbons

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The sticky foil-type aftermarket stuff is not very "thick" and it seems it would fit underneath the factory yellow-type insulation that is also available to purchase in the marketplace. Doubling the barrier seems like a win-win situation (unless I am missing something here).
 
The factory stuff looks good until it gets wet.
The tar based foil stuff (for lack of better words) sticks better and keeps out the heat better in my car. I have both in cars. I seem to think the tar is better, especially on a hot day but I’m not a scientist. Hold on, they will chime in shortly. Lol!
 
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Now this may be a good argument for "synthetics"....
Don't the mice like to nest in original factory insulation? I know they Love the old Jute padding. Was told it had Hemp in it, like the old ropes.
Mice actually "feed" on that.
 
The sticky foil-type aftermarket stuff is not very "thick" and it seems it would fit underneath the factory yellow-type insulation that is also available to purchase in the marketplace. Doubling the barrier seems like a win-win situation (unless I am missing something here).

I found an article on how they insulate small airplanes, and used the technique on both my Mopars. The butyl foil sticky mats work great for deadening panel resonation and to slow the transmission of heat into the cabin, but the real secret to insulating the cabin against heat, fumes and sound is to use a double sided foil type blanket with all the seams taped closed.

The product I used to get is called "The Insulator" and is available from aircraft supply houses. I did find the same product at a better price from Speedway Motors. I use common aluminum foil adhesive tape for sealing duct work to seal all my seams and seal the blankets to the car.

Its easy to keep it out of sight one the interior is installed, and I run the stuff from the bottom of the front windshield, across the floor to the bottom of the rear window and from door sill to door sill. This requires cutting out the various shaped panels to allow it to sit flush to the surface and taping the seams. I also do the doors and under the headliner.

My hardtop sounds like you are in a vault when the door is closed. It shocks virtually everyone who has been in the car. It's quieter than a Bentley inside.

Oh, I use the factory stuff on top of the blanket insulation too.

Aluminized Heat and Noise Insulation Shield, Double Sided
 
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