as far as I know the concept originally came from an aid worker in Africa trying to help people keep their houses cooler. he used two sheets of tin roofing. nothing like the materials we have access to here.
i hear your concern about wind. kind of one of my biggest concerns with metal roofing. you know. giant sheets of metal flying through the air. here in Ontario tho, as I mentioned we're pretty safe. but on my "arctic wall" build I screwed my purlins into the joists with 8" screws. better safe for sure.
it is great to see how fast and how far things have gone towards smarter more energy efficient builds.
look forward to your build and pics.
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