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I'm sure this has been discussed in here before, but don't the nails for tin go on the ridges (tops of V's) and not on the bottoms of the metal roofing as a distributer recently told me? This same person also sold me 750 screws to put on 7 sheets of 20' long 3' wide metal roofing. Maybe I'm wrong, but it seems a disaster in the making to put screws in the flat part of the metal where all the water travels. I did put the screws as he instructed (took less than one half bag of 250)but after putting the screws in I still siliconed around each one. I've never heard of putting screws on like he suggested and wondering if he's wrong? If so, then someone should let him know because he's instructing everyone that buys from him to put them on that way which would be fine until the screw loosens up or the rubber washer wears out. Then you're going to have a seriously leaking roof? As I read on one other site, it would look like putting all your metal in one even stack and then drilling holes in the ridges where you want the screws to go would be the way to go. Is that wrong? Looks like it worked great for all the old 100 year old barns in our area that still are standing perfectly fine??
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Fastening the metal through the ridges is always better then through the flats. After seaching the web for the last 30 minutes I feel confident that the bozo who sold you the metal is not field certified and more then likely says to do it this way because he had problems with someone in the past that probably shouldn't have been putting metal down in the first place and was unbelieveably even far less competent then himself. Through the ridges also works great on storage rooms above garages, especially when it is your sons garage. Also don't forget to trust in your contractor who is 99.89% right on these occasions. Also ask the guy where to put the screws at te top that go through the ridge cap and the metal sheets. If these were through the flats the ridge would look like a roller coaster.
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Depending on the panel profile, both cases can be correct. Also following manufactures installation instructions can help.
The washer of your screw needs a flat surface to seal to. If the ribs are v shaped, the neoprene washer will not seal properly and can cause leakage.
In the cases of 5-v crimp and AP panel, the screws have to me installed in the flat section.
11/2/2009
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