Roof insulation? (FJ40) (1 Viewer)

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Does anyone add insulation between the headliner and roof? I’ve done this in other vehicles with metal roofs and it makes a big difference, but haven’t tried it with a fiberglass roof. I’m adding a new headliner soon.
 
Noise in a FJ-40, say it ain't so. Yea I'm more interested in keeping heat out in the summer. I have a large back heater and can/have drive around at 30 MPH in -30 weather wearing shorts and a tee shirt with the windows down. Kick and cowl vents closed. I'm guessing some sort of glue in closed cell foam.
 
Noise in a FJ-40, say it ain't so. Yea I'm more interested in keeping heat out in the summer. I have a large back heater and can/have drive around at 30 MPH in -30 weather wearing shorts and a tee shirt with the windows down. Kick and cowl vents closed. I'm guessing some sort of glue in closed cell foam.
Same for me. Heat is the only issue in this vehicle.
 
I used an indoor/outdoor carpet from Lowe's for my headliner. Dampens noise, insulates and in my opinion looks better than the white one.

IMG_20240516_200228_111.jpg
 
When I got tired of re-gluing the factory headliner back up numerous times, I tore it out and replaced it with marine (boat) carpet. Helps a little with sound and maybe heat, but not a lot. Mine is not a resto.
 
What they said. Lizard skin for sound n heat has tiny glass beads (hollow) as an insulator, and then an indoor/outdoor carpet would provide two different layers for heat to radiate through and is likely be your best bet. I don’t have a top but was considering it; I’ve used lizard skin on firewall and floor and prefer it.
 
I used an indoor/outdoor carpet from Lowe's for my headliner. Dampens noise, insulates and in my opinion looks better than the white one.

View attachment 3881410

When I got tired of re-gluing the factory headliner back up numerous times, I tore it out and replaced it with marine (boat) carpet. Helps a little with sound and maybe heat, but not a lot. Mine is not a resto.
Links to what you used? Trying to decide which route to go.
 
Links to what you used? Trying to decide which route to go.
Haha, no links either. A $20 carpet and 4 tubes of liquid nail from Lowes is what I bought. Use your old headliner as a template to cut it into the right shape. Leave it outside for a couple days until the adhesive cures, it really stinks at first but it will never sag if you apply it correctly.
 
I used a self adhesive closed cell foam with an aluminium facing.
Although i have an aftermarket steel roof myself, I'd definitely recommend a metallic layer in there somewhere as a radiation barrier; otherwise its a bit of a green house with the GRP roof.
The most effective way to keep the heat out though is to fit a roof rack so you're hiding in the shade.

My foam came direct from China and was very cheap and good quality. You might want to give it a few weeks before ordering that right now though... :/
 
Does anyone add insulation between the headliner and roof? I’ve done this in other vehicles with metal roofs and it makes a big difference, but haven’t tried it with a fiberglass roof. I’m adding a new headliner soon.

I sprayed Lizard Skin, then Kilmat, and finally the headliner, and I am very happy with the results. It’s been 6 months since I did the work in a very hot and humid climate, and it has been holding up with no issues.

IMG_1771.jpeg
 
I sprayed Lizard Skin, then Kilmat, and finally the headliner, and I am very happy with the results. It’s been 6 months since I did the work in a very hot and humid climate, and it has been holding up with no issues.

View attachment 3935341
Did you use the CC headliner?
 
One way to get a cool FJ40 roof is to install a roof rack with a floor - keeps the sun off the FJ40 roof. But, on the hottest days, the radiant heat from the FJ40 roof pales in comparison to the floor-furnace!
 

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