Assuming we're talkin' about 5vcrimp panels? You can place them in the flat or in the rib. My opinion is that they are better in the rib, tbh. Putting in the flat and you get debris on the screws. Prob holds snow up, if you get snow. So, I put them on the v. Doesn't look as good, that's true, but holds up well. Don't screw too tight.
Another one for Fabral, but this is a brochure of theirs and it gives good information about screws, as well as everything else you might need in terms of roofing, so if you come up with any other questions, they are probably answered here too. I really hope this is helpful for you. href="https://fabral.com/media/1182/standard-details-for-metal-roofing.pdf" > description
Check the manufacturer's specs - these should tell you where the screws should be placed. Otherwise you void the warranty (I believe). If you can't find the manufacturer's specs, you can look them up online and contact them, or ask at your local home depot and they are sure to know.
It's difficult to say when no one knows what roof size you have, the length of the panels, where you're putting them etc? So, we're going out on a limb if we say, put 'em every 8 inches or whatever. But, I guess you're a little clueless so I'm going to take pity on you and give you a link that might help. href="http://laughableenthus07.eklablog.com/how-to-install-metal-roofing-a119231994" > description Then again, it might not. Give us more info and maybe I will help out.
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