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Hi All! We had an addition put on our home with a standing seam metal roof over the porch. It appears our GC did much of the install himself. We've had many roof leaks. The first transition piece ripped up with the wind. GC said that piece was temporary and finally hired a roofer (or supposedly a roofer) to fix the roof. However, I just had my own roofer inspect and I'm told the replacement piece used to transition from shingles to metal is coil and not the correct gauge, among other issues. My contractor said this is what he always uses.
Any insight as to what the transition material should be?
I'm also told there is supposed to be a lock (not sure if I understood the word he said) in the valley but all my roofer could see was caulk.
I trust my roofer over my GC, but I'm trying to find something online to show my GC on why the roof is not correctly installed. He said he does them all this way.
Ideally, the valley would have a cleat that the ends of the standing seam panels are locked over. That does not appear to be the case. As far as the flashing -- is there a Z Channel between the panel ribs that this flashing locks over? I'd say the formation of the flashing is probably more critical than exactly what metal it is made from though one of the benefits of a metal roof is that everything can be made from matching metal.
Here is a photo from when the first flashing got ripped off by some light wind. Are the white pieces the Z Channel?
I just found the NC building code on how thick the flashing should be, so I'll check as to what was used and if it meets code.
One other question, on a new construction roof, should the underlayment prevent leaks? Lots of water was coming into the attic when the flashing ripped off. We also had water leaks when only the underlayment was up and the metal was not yet installed.
Thanks again for the help
That was smart to look for the code requirement. The White things are the Z Cleats. One purpose of underlayment is to keep the roof dry if the roof covering isn't there for some reason. That said, you do have holes in the underlayment now from fastening the roof down. Holes in the underlayment may allow water to get through. I am not sure what the pitch of this roof is. Most standing seams similar to yours have a specified minimum pitch of 2:12.
Todd, thank you so much for your insight! I'll ask my roofer about the pitch.
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