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The breadpan fold is used to create a secondary line of defense at the top of the panel against water, snow and / or ice infiltration behind metal Z and / or foam closures.  It is used primarily on standing seam / hidden fastener snap-lock roofing panels as it requires a flat expanse of metal between major ribs.  It is particularly useful when transitioning from a high slope roof plane to a low slope roof plane in areas that experience severe snow / ice conditions.  An example would be a common transition from the roof on the main house to the roof on a porch.

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