I find that hard to believe now adays. Not unless what you are seeing is roofing installed with nails and NOT screws. I see new pole buildings going up all over the place, done by pole-building and roofing companies - not homeowners. All I've seen in the past few years do NOT install the screws on the raised ridges. That because the companies making the roofing only warrantee it if done the way they say to. I don't see anybody in my area of the northeast using nails anymore. Yes, they're faster and cheaper, so maybe somebody somewhere is still using them.
I'm one of the people that resisted the new recommendations of NOT screwing the humps for years. I'm not sure why it changed, but I suspect partly so the screws are less visable from a distance -and more attractive to homeowners. But also, by installing in the low areas, you can tighten the screws more without the metal distorting. I know there were many endurance tests done, and less leaks occured by NOT screwing the ribs. It is those tests that finally convinced me to use the newer method.
About leaking when you DO install in the lows? Nope. I've done many and not had a single leak of any consequence. Not unless someone broke off or loosened screws with a snow shovel in the winter. I've got them installed in unheated pole-barns and many heated homes. With open purlins and also on sheathed roofs. Fabral and Metal Sales both state clearly - screws used on raised ribs for sidewalls only and not roofs. I've been watching closely since many homes in my area and the Adirondacks are gettting new steel roofs. They shed snow much better then asphalt and that's probably part of the reason. I haven't seen a single one in years done with fasteners on the raised ribs.
Taken from the warranty paperwork from the company that makes the roofing (Fabral):
"where exisiting shingles will be left in place, new 2"X4" purlins should be fastened through the decking and into the rafters."
"The correct way to fasten steel panels with nails is to drive the nail through the top of the rib so the washer is compressed securely against the metal. Wood screws with the combination metal and neoprene washers should be installed in the flat area of the panel adjacent to the ribs (not ON the raised rib). This will ensure a lasting, leakproof seal. "
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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