Floor Pan Insulation

[Kyle K]

Hey folks, question for you on floor pan insulation. I've removed all of the horrible old rhino line which was on the floor pans (miserable job). See photo. I'm going to put down some insulation under the carpet, and just bought this from Amazon (https://www.amazon.com/gp/product/B0751CBXBT/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1). This has the adhesive backing and should be fine, just don't think it will be great in the real hot spots.

I noticed when breaking in the new motor the floor pans get pretty darn hot near tunnel where the headers/exhaust run (basically along the line of the red battery wires under lead block in photo) . I was planning to put a more heavy duty heat insulation running front to back at this spot, and the other sound dampener rest of the way.

So my question, does anyone have any advice/product that is good for floor pan heat insulation installed in the floor pan? I'm trying to avoid installing on undercarriage as I'm going to coat that eventually.

Thanks!

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[legopnuematic]

Epoxy or other quality primer sealer and then lizard skin ontop.

 

[eskimomann209]

This is what my amazon account says about that stuff. Bought it twice. Did my firewall all the way up... did the entire floor and back wall. Well I costed the entire inside lol. It’s supposed to be for vibration ... but it works fine for thermal too. I want it colder inside during the summer and warmer in the winter. Call me crazy BUT I also used high density mat AND industrial floor pad.
my **** is NOT allowing heat through the floor.

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[Craig 85]

I used Boom Mat. Great for road noise, but the foil will get hot after awhile. Once the truck is painted, I will install something similar to OEM jute over the top of this and under the carpet. I have used this combination in 3 vehicles and it works great.

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[EvilGenius]

My truck hasn't really been road worthy since I finished installing it, but I went with a similar product just Noico branded. Also installed their foam sound deadener over that. Noico is nice as it has a distinct diamond pattern on the back that is easy to tell when it has been installed correctly with a roller for proper adhesion.

Butyl mat: https://smile.amazon.com/gp/product/B00URUIKAK/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Foam sound mat: https://smile.amazon.com/Noico-Insu...ld=1&keywords=noico+red&qid=1600361370&sr=8-3

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[Bextreme04]

Your best bet is to use a 50-80 mil butyl sound deadening mat on the bare metal, then cover that with an open cell foam insulating layer. If you just use the butyl, the heat will soak right through it and ends up just radiating the heat into the cab eventually. The insulating layer also helps wit hdeadening, so you can go thinner on the butyl layer and run a 120-315 mil insulating layer over the top. It is similar in overall thickness to the heavy pad that goes on the back of the factory carpet, so it doesn't mess anything up to have it that thick.

 

[Bextreme04]

oops, I meant to say closed cell foam insulation

 

[peats]

why not wrap or fabricate heat shields for the exhaust? i have heat shields and dynapad on my '72 k5 to help control the floorpan radiation.

 

[Kyle K]

Thanks everyone for the responses, definitely what I was looking for. Looks like I was good on the first step (with the Kilmat, similar to Noico). But I was missing the layer on top before the carpet (closed cell foam insulation). I ended up going with the one EvilGenius mentioned above (https://www.amazon.com/Noico-Insula...ds=noico+red&qid=1600361370&sr=8-3&pldnSite=1).

I'll be sure to take some heat gun temps pre/post install, as well as pictures.

Appreciate the point about the lizardskin, but trying to avoid spraying if all possible.
And I think fabric heat wrap on exhaust is still possible (in addition) if these layers don't do enough, it's just clearance is super tight right now and after hanging new exhaust.

Appreciate the help!!!

 

[Bextreme04]

Thanks everyone for the responses, definitely what I was looking for. Looks like I was good on the first step (with the Kilmat, similar to Noico). But I was missing the layer on top before the carpet (closed cell foam insulation). I ended up going with the one EvilGenius mentioned above (https://www.amazon.com/Noico-Insula...ds=noico+red&qid=1600361370&sr=8-3&pldnSite=1).

I'll be sure to take some heat gun temps pre/post install, as well as pictures.

Appreciate the point about the lizardskin, but trying to avoid spraying if all possible.
And I think fabric heat wrap on exhaust is still possible (in addition) if these layers don't do enough, it's just clearance is super tight right now and after hanging new exhaust.

Appreciate the help!!!

Be careful with wrapping the exhaust, it can hold moisture and heat against the pipes and increase corrosion. Especially if it is just standard mild steel or aluminized exhaust pipe.