I built a shop with steel roofing about 5 years ago. Currently the roof is open but the shop walls are solid with little air movement below the roof and with concrete floor. If there is any condensation in my shop it is very seldom and very little. Now, the sheds on the side with dirt floors and wide open, grab rain coat at times.

As to steel holding in high winds, old galv. roofing nailed on here has held up to many a hurricane over the years. If you have every thing underneath nailed properly it is seldom you see a loose sheet.

Ron, I think you are correct on what you have said about Ondura. My understanding it is a multi layered paper product. They did have vented and non vented product to seal the ends.

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