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I had a metal roof (PBR galvalume panels)installed on a house I'm building and it leaks around the dormers where the valleys meet the main roof. The way ir was installed the main roof panel just has a notch cut in it and the end of the w-valley trim sticks down through the roof and is visinbel from the inside. The contractor says that is the way it's done but I don't buy it. I finally got him out to look at the leaks and he just filled the cracks with permethan caulk. I don't think the caulk will last long and it looks like a never ending problem to me. Is the way he did the valleys acceptable? I think it should be done like it's shown in the 5-v crimp detail manual(www.semetals.com/MetalRoofing/5V-CRIMP_DETAIL_MANUAL.pdf). I've also enclosed pics of the way he installed it. He insist that he knows what he's doing and that he did it right but, I don't agree with him. I'm also concerned that they only scewed the panels down on 4 foot centers instead of 2. Is that ok? Thanks.
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Jason, you have what I refer to as a "dead valley" on each side of your dormer. The proper way to flash this area is to create an end lap in the roof panel at the point where the valley trim terminates. This allows the valley trim to be installed in between the two roof panels at the aforementioned end lap. The attached pictures are architectural roofs but the process is the same. In your picture, it looks like you have an R panel roof. You may have a panel rib right where the valley terminates, which would block the water flow. If this is the case, you can get a roof curb company to make you an outside cap cell for R panel with a long upslope flange on it. That way you can cut the panel rib on the lower panel at the end lap and install the cap cell over it to seal it off. The long upslope flange of the cap cell will extend up, under the top panel at the end lap, completing the seal.
12/6/2007
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8/26/2010
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