47-55.1 cab insulation

[nvrdone]

Ok, I'm at the point of needing to insulate the cab against heat. Any recommendations from anyone about what works good?
Thanks.

[Hcb3200]

More details please.
Are you doing a true restoration.
Just building a resto-mod and you don't want to roast.
Showing it, driving it daily or just letting it sit in garage.
Covering it with what material.
Want authentic or modern material
etc etc.

[nvrdone]

It's a fair weather driver. Just dont want to roast. Floor is covered with carpet. Right now our daily temp is mid 90's and it gets rather hot in the cab.

[Getter-Done]

My Nephew and I put Kilmat and closed cell foam in his 83 chevy and it made a Huge differance in heat and road noise issues.
A roller makes easy work on this stuff.

Link: https://www.amazon.com/Kilmat-Deaden...7&sr=8-18&th=1

Link: https://www.amazon.com/Sound-Deadeni...0751CBXBT?th=1

Link: https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

[Hcb3200]

I agree the roll on sticky stuff seems to really be in a lot of trucks lately.
many brands and the local restoration shops can help you out with some deals

The old school jute matting or fibers can work but I don't like it because if water comes in it soaks it like a sponge and takes forever to dry.

Also what did work really well on some heat issue was well placed metal heat shield under cab where exhaust was running. This way the cab flow was not getting that radiating heating. Especially here in the south with these 90% days.

[mr48chev]

Agreed with the heat shields with a bit of air space between them and the floorboards. I'll let the muffler shop figure out where they want to put the mufflers and then install heat shields above them if they are under the cab.

This is a homework exercise for me because I want to know what people have used and if they think it works

[leegreen]

I used Killmat from Amazon and am happy with the product, but after I bought it I learned it is made in a country that is in the process of a protracted invasion of a neighboring country. I'd not have bought it knowing that in advance. But decide for yourself.

Anyway, I did the rear of cab, floors, ceiling and as much inside the doors and up the firewall as I could. The floor also has a rubber floor mat on it. It made the cab feel very solid and quite.
My exhaust exists under running board just behind cab. It has quite a drone noise, so until I make a longer tailpipe I can't report further on how well killmat blocks road noise.

[e015475]

Killmat and similar foil-faced sound deadening material are good for vibration damping of sheet metal but will only help a little with controlling heat.

The rule-of-thumb for Killmat and the like is that 65% coverage will damp a panel to about 95% of what covering it 100% would, so that's what I shoot for. I used the 80 mil Killmat in the cab of the truck. Took about a box and a half.

To control heat coming into the cab, I put about .25" of self stick closed cell foam. Unlike the Killmat, you need as much coverage as you can. I did the roof, firewall and floorboards, including under the seat with foam. The vertical panels behind the seat will also get covered with foam 100% (but Killmat to 65%)

I met a guy at a car club event that was an NVH engineer for Nissan. He said that the car manufacturers were beginning to use carpet with a mass loaded vinyl backing in an effort to quiet interiors even more. You can buy mass loaded vinyl at HD and do it yourself, but I think that's over the top for an old truck and I'm going to go with a jute backing under the carpets.

[e015475]

Oh. I think the idea of a heatshield to cut down the radiant heat from the exhaust is a great idea - going to do that too.

[dsraven]

the best thing to control heat from exhaust is a light metal heat shield spaced off the underside of the floor a little. look under any new car where the exhaust routes, it's there. they don't do stuff like that because they wanna run another line at the factory, lol.
has anybody with sound deadener mat on the truck floor had an issue wuith it becase it got too from the exhaust?
my son did an S10 when he was just out of school. he used the deadener and the felt style underlay under the carpet. warm in winter, cool in summer and pretty quiet inside (for an 82 S10)

[scott123]

Most any of the brands will work. I ordered the Summit brand in my last truck. The pic looked like a roll but when it came it was rolled but was actually like 16"X16" sticky back squares. It is a 69 Chevrolet and I think it helps pretty good with the sound and maybe some with the heat. (Like anything between the heat source and you carries some 'R' rating but how much? Who knows?)

As stated before a light piece of sheet metal that provides a heat shield as well as a heat sync with an air gap on either side is maybe the most effective way to avoid heat making its way into the cab.

I have a buddy who used the foil back rolls of insulation from Lowe's and his 72 feels as good as my 69.

Scott

[unclebrad]

Not exactly cab insulation but I bought some exhaust pipe wrap, mostly to protect the fuel line and starter from heat, but I have to think that, if it is keeping the exhaust heat moving through the pipes, it is probably helping with cab heat too. Every little thing helps, right?

[Getter-Done]

Originally Posted by unclebrad

Not exactly cab insulation but I bought some exhaust pipe wrap, mostly to protect the fuel line and starter from heat, but I have to think that, if it is keeping the exhaust heat moving through the pipes, it is probably helping with cab heat too. Every little thing helps, right?

For Sure

I used this stuff on a similar project.
It really helps

[Florida5100]

Kilmat all over plus OEM firewall backing, coated headers and Vintage Air A/C keeps me comfortable in South Florida heat.

Only bad part is my original-style vinyl seat which induces sweat even when its cool out.

[jweb]

Most heat will come from the firewall. So first start by making sure you have all holes sealed. Add Killmat ( or similar) and closed cell foam.

If you have a stock style heater make sure you have a shut off valve. You can get a lot of heat from the water circulating through the heater core.

For the floor, back of the cab and roof. Do the same as the firewall.

If you're concern is noise add Killmat in the doors and make sure you have good seals everywhere.

[schovil69]

I used a layer of Siless sounds deadening plus a layer of Siless heat shield in a '56 Belair recently. I expect it to do what it's designed to do but haven't been able to find out yet.

[vintovka]

Anyone concerned about moisture accumulation and rust under these coverings?

[nvrdone]

all the info i'm finding says that because the product is closed cell, they do not allow moisture between the insulation and the floor.

[fauXGT]

I wanted to stay with the stock look by applying 'Lizzard Skin' to inside, including floor, fire wall, under dash, roof, inside doors and in corners. Sprays out like paper mache thru a straw but gets into cracks and crevices. Sprayed extra on floor/firewall/kick panels to sand flat and then primer/paint. Still in primer. Alot of work, but amazed at the sound suppression so far. Next is heat check.