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Hi, your forum is great, many thanks! I'm installing a corrugated roof on a monoslope shed (low pitch of 1:12). It's standard 2 1/2" corrugated, 29 ga., overlapped 2 ridges. Manufacturer says to screw in valleys, and to put a strip of butyl on the outermost ridge, which I did. I'm using 1/4" x 3/16" butyl tape, and I screw the valley right next to the tape. But the butyl tape lifts the edge a bit, so the edge seems a bit high to me. And when I look under the edge, although the butyl has sealed about 95% of it, I can see several small areas where the butyl hasn't sealed, so there's a small "hole" or gap.
I tried gently but firmly pressing down on a hot day, and that helps a bit, but not completely. Rain doesn't seem to be a problem, given that there's another ridge the water would have to climb before reaching the underlying panel's edge.
I live in the Northeast so I'm wondering if ice buildup will lift the edges?
If so, what's the best solution for this... should I screw through the ridges where the butyl is? Or just apply tube sealant to the edges? Or something else?
My gut feeling is that you will be okay. Have you reached out to the roofing manufacturer for their input?
I personally think that screwing through the butyl is not a bad idea. Again, though, check with your manufacturer.
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