One of the issues with using PC for a roof you will be sleeping under is its affinity to absorb water. Due to the weight of water (8 pounds per gallon) you could wind up with a roof structure failure as best and the whole soggy mess in your face wile you are sleeping.
I would recommend a good steel roof and conventional fiberglass insulation above conventional drywall.
Maybe not 100% green, but chingles safer.
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