Large structure with sealed attic / fiberglass
I have a 48×75 post frame structure with a metal ceiling. Prior to putting up the metal ceiling I installed a 6mil plastic vapor barrier. The entire interior is encapsulated with the 6mil plastic under corrugated barn/ag panel metal. I want to blow R60 into the ceiling, but my metal spans 8.5′. I am worried about the weight of cellulose. I used R-panel on the ceiling for a higher load rating and span, but I still think R60 with fiberglass would be much lighter.
My main question is, since I have totally encapsulated the interior and I do not have to worry about air movement, would I lose much benifit by going with blown fiberglass instead of cellulose?