Hahahaha oops.

It's styrofoam (like a coffee cup) with foil on both sides. Kind of like really thjin insulation for a house, but about 1/4" thick...
A little different than closed cell foam we have been discussing. but still closed cell...

I would expect the closed cell foam to be easier to work with, and probably hold up to the heat better. I've been researching roof insulation, and that's what I've found. The Styrofoam insulates well, but doesn't hold up as well to heat, like hot attics. That roof is going to be like an attic.

You want 3M Thinsulate if you want the best/better stuff available.

I've used it in my XJ and again in my Truck. It's meant for exactly this use.

I went ahead and covered the roof with the Noico deadener and ordered this stuff today. One roll should be just enough to do two layers.

That 3M Thinsulate is nice but a little to expensive for something I'm not living in.
​​​​​​

That stuff looks good....

3M is calling their stuff more of an acoustic material and seems to talk about it that way more than an insulation. I'm sure it would work as an insulator also, but like you said, spending $100 or so for something I spend about 20 minutes a day in doesn't justify it. I'd be ok using that foil lined foam and putting in a couple layers attached to the back of the headliner.

With all the windows I'd be surprised if the 3M stuff helped much more than the stuff I bought. It should be here on Friday.

When I did mine I really wanted to use the DynaLiner over the DynaMat.
Was thinking the 1/8" one. They also make a 1/4" and a 1/2" one.


Thinking it would have taken 3 boxes to do the whole roof. I couldn't justify the money.
And the only reason I was doing any of this sound deadening stuff in the first place was cause "well while we are here".
More a turn up the radio kinda guy.
But I was putting in an overhead console so "while we are here".
Was putting in new door checks and Infinity Tweeters in the front doors so "while we are here".
Was swapping out regular glass for Privacy glass in the rear doors and cargo areas so well you get the idea. LOL.

I have 20% tint, and I have noticed a difference in the temp when get in to leave work from before I got them tinted. And I park parallel with the suns movement, so it really only hits the windshield, roof, and back window directly. I'm sure whatever I decide to use in the headliner will help a decent amount. Even if it only drops the temp another 5-10°F... that's noticeable. My A/C is pretty cold so even though its only a 12-ish minute drive home from work, it'll be nice and cold once I get home if I need to grab the kids and go somewhere as soon as I get home.

I've debated some kind of partition that will block off the cargo area and I'm only trying to cool the front half. Something easily removable and see through. but I dont want a dumb piece of plexiglass behind the back seat... that might be the only option.

I almost got finished with the first layer today. Sorry I don't have a IR temp gun to get real readings, but the difference from the bare metal vs the Noico deadener temp wise was marginal. Kind of surprising. Now I wasn't trying to be a hero so after about 8-10 seconds the roof was to hot to touch with the Jeep out in direct sun at around 1pm. With one layer of the Amazon stuff it was still kind of hot, but I didn't have to remove my hand. After putting up a 2nd layer for testing not much heat was coming threw so for 38 bucks I believe if you have the headliner already out it's worth getting a roll of this stuff.

For my Subaru wagon I used a 1/8 inch closed cell foam with foil on one side and sticky on the other from Lowes. It's for wrapping HVAC ducts in your house. I don't recall if it was two or three rolls to do two layers, but it helped with sound and heat inside, but I think it was the straw for my roof paint, but that paint was close to EOL anyway. It was cheap and easy, but the foil is thicker than the kitchen stuff and I got about 100 cuts all over my hands from it.

Can you throw a link up for the stuff you used so I can take a look at it?

It's the stuff I linked in post #19

So did you just get the white one? or is it a bad picture and it is the foil stuff?

It's the one that's white on one side. I'm not sure if it really make a difference.

I would start with the actual insulation values of various materials.
Do a search on 'insulation materials r value chart'.
A quick read show that spray types are good, as are polystyrene and polyurethane panels, ie 'that pink foam board stuff'
Good luck!