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Old 03-11-2008, 05:17 PM
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firewall insulation

Hi
I bought insulation for the inside of my firewall and it is about 1/2" thick and has the alluminum on one side only, the other side is like a jute material or something. It says to glue it with the alluminum stuff facing the firewall,but I was wondering if it would be OK to glue it with the shiny side out?

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Old 03-11-2008, 08:23 PM
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Thermozite is meant to be installed with the foil side to the firewall. It's the first layer of heat shielding. It also isn't very stable to be a covering over the padding material.
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Old 03-11-2008, 09:09 PM
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so then I should glue the foil side to the firewall--right? Is there anything I can cover the padding side with? I also have another product that has the foil on both sides,but it's not as thick and I thought maybe the thicker stuff would work better???
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Old 03-12-2008, 09:05 PM
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The other stuff is most likely Heat Shield (tm) insulation material. Actually, that stuff is the bomb. When it first came out, the resto shop where I worked was sent a glove of the heat shield. You could slip it on and hold a propane torch up against your hand and not feel a thing. It's not overly expensive either.

I usually use the regular Thermozite on a stock replacement, to match up to original and to help smooth out panel irregularities. The heat shield is a nice alternative in tight applications, such as an old-bodied street rod that doesn't have a whole lot of room to begin with.
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Old 03-13-2008, 10:35 AM
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my car is a 26T and i'm installing a 350-350 would u recomend using the thicker one with foil on one side or the thinner one with foil on both sides?
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Old 03-21-2008, 06:36 AM
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use the thinner stuff for a cleaner install
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Old 03-21-2008, 09:14 AM
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I picked up this magazine the other day that I never saw before its called Collectors Edition STREET ROD Milestones Nice mag! anyhow they do a a car insulation and they use strips of dynomat and then they use the foil on one side stuff and put the foil facing the interior they say that way it creates an air pocket similar to a double pane window and its that layer of air that provides the insulation ???
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Old 03-21-2008, 10:57 AM
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you do want foil towards the firewall to stop "radiant" heat coming into the car....

to see how effective foil is for stopping radiant heat...wrap a piece around the rad hose....grab the hot bare hose with one hand and the wrapped part with the other at the same time....

go get your wife's roll of baking aluminum foil (easier to work with, it's thicker) in the kitchen and some contact cement and glue that to the jute side or the firewall if you want the other foil side showing

the purpose of the jute is to "help" keep the inside of the car stay warm or cool, (same as attic insulation)

foil on both sides is better because the only 1/2"(?) of jute is a poor heat insulator (R value)

Last edited by red65mustang; 03-21-2008 at 11:13 AM.
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Old 03-21-2008, 04:21 PM
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Thank you for the info , I'm going to look in that mag and see what shop was doing it the other way & see if I can get in touch with them and see why they are doing it that way . I allways thought the foil went toward the firewall like you said. But I have both kinds,foil on both sides and foil on one side,but the one with foil on one side is thicker,thats why I was thinking of using it , but I don't want the batting showing
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