Thread: Heat/noise insulation. above or below floor?

I used 10mm foil backed foam from Clark Rubber. It's about $28/metre (1.1m wide) and rated to 105 degrees. I did the firewall as well, but that was while I had the front guards off. It's a bit of a mission to fit it around everything. I've attached it with self adhesive Velcro so it can be removed for cleaning and corrosion inspection, but others have just glued it straight on.

James.

I suspect that everything being equal they are equally effective. But once installed, my view is that it is better outside - but a lot harder to install, simply because the inside is easier to get at.

John

That's a good point John. I should have read the question a bit better (was in a rush before). What I described above is installed on the outside/under floor. On the inside I have high density 10mm foam glued to rubber to form the mats.

James.

Some exhaust wrap will probably help,
It made the A/C much more effective on the Defender

eBay exhaust wrap

I soaked it in a bucket of water before wrapping to keep the fibbers from going everywhere but still had itchy arms for a day,
also as it drys out it shrinks onto the exhaust a bit to keep it tight.

Originally Posted by rainman

I used 10mm foil backed foam from Clark Rubber. It's about $28/metre (1.1m wide) and rated to 105 degrees. I did the firewall as well, but that was while I had the front guards off. It's a bit of a mission to fit it around everything. I've attached it with self adhesive Velcro so it can be removed for cleaning and corrosion inspection, but others have just glued it straight on.

James.

Do they make that stuff thinner? I'm thinking 2 layers of 5mm (resulting in two layers of foil) would be better than 1 layer of 10mm.

Inside is more effective and easier to install. 2 layers would be more flexible therefore easier to fit. I have done the front of firewall very difficult to do.
Anything underneath would get destroyed.
Its a big job but wirtwhile. Its the flat panels that seem to pass the noise thru and resonate .

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Originally Posted by Brad110

Inside is more effective and easier to install. 2 layers would be more flexible therefore easier to fit. I have done the front of firewall very difficult to do.
Anything underneath would get destroyed.
Its a big job but wirtwhile. Its the flat panels that seem to pass the noise thru and resonate .

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Noise I can deal with, after 44 years of driving LandRovers I'm mostly deaf anyway. It's the heat coming through the transmission hump, centre seat panel and floor panels at low range speeds that is hard to bear.
I was thinking with the insulation below, less heat would reach the metal panels in the first instance.I fitted 10 mm foil backed foam to the underside of the bonnet a few years back and can't say I noticed a heck of a difference to noise levels there. The foam isn't very dense. If the same type of foam that is used for industrial airconditioning insulation was available in sheet form, i'd like to try glueing that to the underside of the panels as it is very durable.
Bill.

My best efforts on noise are:

Bitumen based roofing tape (foil backed) to deaden the panels, closed cell foam over the top for the insulating layer and your choice of carpet or trim over the top.

The bitumen tape by itself works okay, but doesn't muffle that well. The closed cell foam muffles well but doesn't stop the panels buzzing. Together they work very well.
Open cell foam is better for heat than noise.