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You can have condensation issues with a metal roof.
The issues occur when there’s high humidity and enough radiational cooling occurs to make the moisture condense out of the air.
Won’t happen every day and If you have a ceiling you’ll never notice it.
I’ve not seen structural issues from it.
There’s some preformed metal with a anti condensation coating available, have not used it.
ABC Supply sells one product.
Should be less expensive than going from purlins to sheathing.
Posted from my iPhone/Mobile device
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