After reading the Alaska article (hard to do), and looking at several links in this post, I think I'm just going to have suck it up and put an air space somewhere. My current idea is attaching the non-aluminum side of 1/2" polyisocyanurate to the inner 1/4" paneling. The opposite aluminized side will face outward. To that side I'll glue some narrow 1/2" pieces of something that won't burn to act as firring strips. This will be the air the experts want opposite the reflective side. I may go up to 1" thick firring strips.
Next to the air space/firring strips, perhaps another 1/2" board of polyiso or some better stuff from the links above.
Then, a 1 1/2" layer of the duct insulation someone mentioned above with vapor barrier to the cabin inside. Next-to-last, I still want some sort of reflective insulation between the fiberglass and Lizardskin, if not Reflectx, something with air pockets, as well.
I was going to make some Reflectix panels for my windows. I think I still will for the summer. In cold weather, now, I think I need a second set of Amarflex, or the equivalent.
JC
