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 - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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