+1 for polycarbonate, or anything that's not metal and is lightweight. There's a polycarbonate product specifically for roofing application that has an air gap built into it. I won't post brand names here, but a quick google search and you'll find it. The other benefit to using light materials is the ease that the roof will roll off especially if it's has to be done manually. If it's motorised then weight becomes less of a factor but should still be of consideration. Just my two cents.
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