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rusnak:
Too many different scenarios and too little input information.
It is beyond my basic expertise to attempt to offer such a limited (layman) opinion.
Sorry man.
My gut instinct would be to go with open cell (it is more like wood), but the science is still out there.
I would definitely make sure the wood structure is solid...and the roof sound...before deciding on the insulation choice.
Solid structure. Then insulation.
Keep digging at structural info.
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