extechguy

I plan on putting in A/C on my 68 convertible and want to insulate the floorboards to help the efficiency of the unit. I see a number of different products on the market, I want something to go under the carpet that will not be too thick but still block the heat. I have the underbody transmission hump insulation in place already.
Thanks

SIXFOOTER

So a google seach for Home Made Lizard skin.
Its a paint with tiny glass ***** in it. Seems to work pretty well

jcloving

I put hushmat (for sound deadening) and Reflectix (for heat) on my floorpans, tranny tunnel and firewall. It worked like a charm.

I used alumnum duct tape to hold down the refectix. It has held perfectly.

REELAV8R

I used the reflectix stuff too. Got it at a home improvement store and used 3M spray adhesive to hold it in place. I used it from the front firewall to the back wall behind the seats. Put it under the carpet.it is very effective for heat.

great68

I too have a 68 427 with factory cast iron headers that generate lots of heat. I put reflectix reflective insulation (not the bubble type the foil type you stick on from lowes) on the outside firewall and the reflectix mat or bubble on the inside under the carpet and that stopped about 80% of the heat. My neighbor, who has his first vette from 1960 told me if I get some ceramic header and rap them the rest of my heat problem will be gone and my a/c will run on low!!!! The radiant barrier on the outside of the firewall seem to help the most cause it stopped the heat from getting in the cabin. Hope this helps.

extechguy

What is reflectix normally used for if it is sold at home improvement stores??

marshal135

Used for HVAC.
Heating,ventalation,air conditioning plenums and ducts to insulate
and lower energy bills by reducing heat and A/C loss as it passes through the ducts.
It either keeps heat and A/C in or out depending where it is applied.
I'm planning on using it on the underside of my floorboards and then reinstalling my stone shields so it will be undetectable.
In our application for the cars we are trying to reflect or divert the heat away as cold air is drawn to warmer air.
Marshal

jcloving

Yes, refletix is used for home insulating. I was leery about using it outside the cabin though. It is probably flammable....like everything else on this car.

Now on a long drive, the only thing that gets hot is the shifter shaft. It is a nice steel thermal conductor between the tranny tunnel and the cabin. It probably gets up to 90-95deg. or so. I will have to check. I haven't figured out yet how to insulate that.

Patrick73

"The radiant barrier on the outside of the firewall seem to help the most cause it stopped the heat from getting in the cabin."

That is what I did. Lower firewall on both sides.

FKING1

Dynamat Extreme on my 70 coupe.
Pricey , but, good stuff.

marshal135

JCLoving,
you may have to start driving with a pot holder mit if that shifter is getting that hot
Must make a nice hand warmer in the winter
Marshal

jim2527

Reflectix