SMF - Just Installed!
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I use duct insulation, it is foil faced with bubble mat in between. It blocks heat and noise, also is very lightweight. Any material that has an air chamber in between two surfaces offers better acoustic and temperature insulation.
Hi ChiefThere is a company in Denver B AND D SUPPLY that sells the insulation in rolls and it is very inexpensive. There are several different thicknesses i bought a 6 feet roll (its 48 inches wide) and did my entire floor and the firewall for my 68 convert and had much leftover. I think I paid less than 25.00 for the roll. Larry