To properly install the screws in corrugated roofing do they go in the valleys or the ridges?
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There is no one cut-and-dry answer here for this. Ive seen both, even from the same contractor.
In some cases, it is easier to install the screws in the valleys (particularly if there is a rather 'high' ridge, which could be damaged by over-torquing the screws).
ALL metal roofing screws should have the rubber washers under the screw heads, no matter if they are located in the valley, or on the ridge.
These screws should be checked annually as part of a yearly maintenance schedule! Make sure the rubber washer has not deteriorated, and that the screw is in as tight as it is supposed to be. Make sure that the trim pieces are attached properly, and, that any insulating, or sealing "fillers" are still where they are supposed to be.
Have Fun
On the ridges. Then the water runs away
the valleys
The valleys are where the water will collect, causing a leak. Thr ridges are the best bet. I've walked on a lot of the roofs that you mention and the screws are always on the ridges. Good luck.
the valleys, however the screws must have a rubber seal under them to prevent leaks,you can find these screws at any metal bldg supply, some hardware stores and most lumber companies
In the valleys
If you put them in the ridges it will break at that point
On the top using a rubber washered nail or screw.
Don't over tighten or bend the metal it will increase the chances of a leak.
Hope this helps.
ok, they rubber washer screws must go in the ridge. They should be tightened only to the point that they secure the roofing, that is how you know how tight to get them. If you put them in the valley you will generally strip the screw and it will leak. If you want a pro opinion talk to a roofer...a qualified roofer..with experience in metal roofs..you are going to get both opinions...Ben Franklin said something about common sense, right?
Check the manufactures recommendation and installation guide. Just search for "corrugate roofing installation. "
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