I have an old anxiety-laden patent solution where polycarbonate roofing transitions to metal roofing. My problem is keeping the joint sealed; I have tried to solve this with an elastic sealant provided by the roofer, but as shown in the pictures, the seal cracks when it dries.
I am well aware that it is dirty, ugly, and improperly constructed, so I would prefer not to receive comments pointing this out. However, I would be very grateful if any kind soul could help me think of a flexible, durable, and waterproof solution that doesn't add too much height, as the roof pitch is so low that water pools after rain because the profile at the bottom edge of the plastic roof stops it.
My own thoughts are that I could either supplement with the same sealant, potentially reinforced with some kind of mesh on a roll. The problem there is that I can't find the same brand for sale anywhere, does anyone know alternatives?
The alternative as I see it is to use butyl tape/sealing tape, I see that it's possible to buy thin butyl tape that should work, the question there is how much movement such can tolerate if so?
My own experience with channel plastic is that it needs a fairly substantial overhang to function well, especially if the slope is poor. Do you have the option to lift the plastic a few cm with spacer battens and let the plastic land on a flashing which then leads down to the sheet metal? I don't have much faith in flexible materials.
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