I don't know what "lazy" has to do with it. It's just as easy to install the screws either way. I can see calling the use of nails "lazy", maybe.
I just removed an entire roof I installed 10 years ago that was screwed in the flats. I found no evidence of leakage. This was to 5/8" plywood with a layer of "ice shield" underneath the steel, not raised purlins. Had to remove the roof to alter some of the rafter structure and re-installed. Good thing it was all screwed, otherwise I'd never been able to do it without damage.
I found that with the roofs I installed by screwing in the flats . . . often the seams wouldn't close completey until I added some screws in the high ridges anyway. I also like having screws on the high ridges when it comes to walking them with snow and ice on them. Easier to find and get a foot hold.
Regardless, all the major companies that make the roofing recommend screwing the flats. Nothing to do with "laziness", but maybe something to do with appearance? Seems when you screw in the flats, the screws aren't as visable from a distance.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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