Tub/firewall insulation

[XJsavage]

Just got done cutting out my stock TJ firewall and in the following few days of re-install, I thought about going back with some sort of insulation or sound barrier. Im replacing the firewall with 16 gauge plate steel which will be sealed airtight to the rest of the tub. For now, heat coming in the cab is a concern. Swamp ass is brutal this time of year. My question is, what brand insulation/barrier has everyone had the best luck with, what's more flame proof than others and should it be installed on the cab side of the firewall or on the engine compartment side?

 

[YotaOnRocks]

No experience with anything but could you maybe grab a piece of the insulation that comes on the underside of some factory hoods from a junkyard and use it?

 

[Mac5005]

16ga aluminum heat shield on engine side, with 1/4" or more air gap to firewall.

Easy to form and work with

 

[moldman05]

Spray on foam is one the best. It adheres very well. It performs in high moisture or wet conditions. It doesn't like uv light (sun light). It will combust but just puts out black toxic smoke. There is a fire retardant version. If you have a fire behind the fire wall or under the dash the smoke from plastics or wire insulation is just as bad. It will seal the area applied and provide excellent R- value and sound absorbtion.

 

[YotaOnRocks]

Are you talking like great stuff foam you buy at hardware store or something else?

 

[XJsavage]

In the spray foam world there's open cell and closed cell foams. Open is softer, closed is harder. I remember this from spraying attics and crawlspaces with both. Application is terribly messy and expensive.

 

[Chris_M]

I've used this with good success on a firewall:
https://www.designengineering.com//...l-products/under-hood-thermal-acoustic-lining

as well as this on the floor,or inside of your firewall:
https://www.designengineering.com//category/catalog/boom-mat-acoustical-products/under-carpet-lite


edit: i have used these products on older class 8 heavy trucks, with big engines making alot of heat and heat soaking the cab when the truck is parked, and operating a PTO at high idle. Problem solved!

 

[XJsavage]

^^ That's dang close to exactly what I'm looking for.

 

[RobMcBee]

Never used it but theres always this option....

http://www.lizardskin.com/car-ceramic-insulation.html


http://www.eastwood.com/lizard-skin...ODE=GA220010&gclid=CPj2lLjAhsYCFdgUgQodG2YAYw

 

[rodney eppes]

Probably in a magazine, I was just reading about Boom mat. They were advertising one at 4mm thick; probably for under carpet.

 

[CrawlnYota33]

Lowe's carries a simular mat to dyna mat in the store and it is much cheaper. Rolls out and is sticky on one side and reflective on the other.

 

[Fabrik8]

Check out DEI, Thermo-Tec, Kool Mat, Heatshield Products. Make sure you pay attention to the type of application, because some products need to have an airgap or be applied to a heatshield spaced out from the firewall, etc. Some products reflect, some insulate, some do both.

Stick to racecar products if you want fire retardant, etc., with the lowest weight. Mass-damping products like dynamat work by making the panel heavier and lowering the resonant frequency, but are obviously best for sound control at the expense of adding a lot of weight.

Also figure out which side of the firewall you want to add the product to, because some are meant for the interior side etc. (Like dynamat) and some meant for the engine bay side. Sounds like you want the engine bay side I'm guessing..