So whats the correct answer? As Luke Wilson points out in his follow-up video to address this question in particular, the correct answer is that screws should be fastened in accordance with the metal roofing manufacturers instructions, period. To fasten anywhere other than where the manufacturer recommends not only increases your risk of having problems down the line but it also nullifies the warranty for your metal roofing product. And the fact of the matter is that most U.S. metal roofing manufacturers say you should put screws into the flat, because this location offers a solid wood surface just beneath the metal panel, resulting in a safer, tighter, more secure seal.
This was off a metal roofing companies website. Do as you please, but I think insisting that the ribs is the only proper place to fasten is being a little short sighted. My 40x68 metal building was professionally installed and all screwed in the flats with zero leaks. If screwing in the ribs works for you, so be it, but it's not the only way to have a rain tight roof.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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