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I hope to put some corrugated metal roofing in place this summer. Much like already described; vertical spacers atop the trusses and sheathing, then 2x4 purlins crossways. I will have felt and foam board insulation directly against the sheathing (under the spacers).I'm toying around with the idea of first installing "every other" piece of metal, then coming back and installing the "filler" pieces on top. I've never done it this way, and it will take a bit of careful measuring ... but I think it will make future repairs of the roofing much easier if any are ever needed.
You are right ... and I am guilty of over-simplifying. I would still install one sheet at a time across the roof, just make every other joint "tucked under" instead of laid over. Might be helping mixing metal with poly sheets on barn/shop work. As I say, I've never tried it ....and the plan may pass quietly with time.I have trouble dimpling metal by walking or working on it, as the final edge is near. I use sheets of plywood and rubber tumble mats to minimize the risk. (Guess I could try losing some weight .... Nah!!)
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