Donut757 wrote:In terms of insulating didnt think that minimal of air gap between outer skin and insulation would make a difference.
Outside of that no reason really???
Got you.
Where we live (S. Texas), we try to keep the inside AC cooled temperature from the hell that is outside. The air gap and the reflective backing of the insulation helps quite a bit. Please don't confuse that with the worthless reflective wrap.
I chose to allow the Skin some space for condensation and air-out during the 17 days of winter that we get every year. Still, I sealed the inside the best I could using aluminum tape to join all insulation boards. The strips provided the gap and were secured to the skin using masking tape, the board insulation kept the strips in place.