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Do I Nail Corrugated Roofing In The Valley Or The Crown?

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David Hinners Profile
David Hinners answered
You want to nail through the peaks of the corrugation when using the panels on a roof. This is because any rain running down will tend to collect in the valleys. Also make sure your fasteners, whether nails or screws, have the sealing washer under the head. Do not overdrive the nails, or you will split the washer and possibly leave a dimple where you can get a leak.
thanked the writer.
David Hinners
David Hinners commented
By the way, if you are using screws with a 2-part metal and plastic seal, they work best on a flat surface. So, if you are using that type of fastener along with the type of corrugated roofing with periodic ridges and flats between, attach your panels in the flat right next to a ridge.
Bruce Tillson
Bruce Tillson commented
If you were to nail through the peaks of the roofing, it would put the inside of the peaks on the rafters....that would put the valleys BELOW the actual roofline. Corrugated roofing and the new metal roofing products are nailed in the valley portion using the self sealing screws,
charles battis Profile
charles battis answered
There's an under lament that you put (use) in the valleys of the roof. You will nail this no closer then10 to 12 inches from the valley. On the peek of the roof you will cap it .You can either buy the cap or you can make it. To make it you will need a brake(rent one)you cut the size that you need,(no less then25 inches) bend at the center to the pitch of the roof, then nail at the bottom corners so that the nail will be covered with the next piece. There should be directions with the material, if not ask your supplier for them. It sounds hard but it really isn't. Get a few extra pieces just incase of mistakes. Good luck

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