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We used to be able to buy a Mylar backed insulation at boat shops that would work good on a doghouse. Same stuff used inside the cowl of outboards. This is all I can find now. Not nearly as good. http://www.autozone.com/autozone/acc...er=398829_0_0_
After sticking it to underside of Doghouse, sprayed 3M adhesive over it and placed the foil backed insulation that came with my coach from factory over the top of Dynamat.