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RS, search "interior insulation" here in the C3 section and you will find all kids of info. some go with the pre-made kits and others go to home depot and lowes and buy the same stuff that is cheaper. I got all my floor insulation (4 rolls) from home depot for about 60 bucks. It is the insulation used for heat/ac house ducting. Works outstanding and I can drive my car now for hours in the 90 degree plus weather and my feet don't blister anymore and it is very quite. Put a layer of refletix stuff down and also some insulation. YOu will love it. It will be the best 100 bucks you ever spent on our money pits.
Yep I used reflextix from lowes and it worked for me. I don't remember how many rolls but, just measure the width X length to get Sq. feet for coverage. Oh yea don't forget the silver tape to seal the pieces together. Ed