Anyone have advice on this issue? Owens Corning makes a kit (Lowe's now leading the price @ $54) with an R-8 value, but Lowe's / Home Depot / Ace do not stock it, so I'll have to mail order. I really want to do this while the house is mine.
I've read 100 opinions online. Some people say use rigid foam or the metallic heat shield stuff, but you only get an R of about 3-4 with those methods. I'm wondering if I could just buy a few rolls of insulation with a backing, cut to size, and somehow affix it to the door.