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 Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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