I read with interest the post below reference the installation of metal roofing on a small shed. I also am building a small shed but with a gable roof. I intend to buy my corrugated roofing metal at Lowes but the only ridge vent material I have seen either there or at HD has a straight base and does not have a matching pattern for corrugated metal. In my mind this means that the vent base would have to lay on the high ridges of the corrugated metal thus possibly allowing wind driven rain to enter. Is there a special type of ridge vent made for this type of installation or do you have to do some engineering to make it work?
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I don't really know anything about metal roofing, but why not put a Cobra vent type material under the metal ridge. You'd probably have to make sure it would bottom-out in the corrugations though.
They make a perforated J trim that goes over the ribs of most metal roofing. You slide it on before you put the top screw into your metal roofing and then put the ridge cap on over that. It could be a special order item depending on the manufacturer.
Buying stuff like that at HD seems pound-foolish to me. If you get your roof from a real outfit like Metal Sales (mtlsales.com, I think) then you can buy all the right trim from them and it works well as a system. Look at their website, call a distributor, get pricing, and see how it compares. The last metal roof I did had about 8 different trim profiles and 3 or 4 of them were made to order. Even a simple shed roof needs 3 trim profiles. Don't know about your HD, but the ones around here don't have that stuff.