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Trapezoidal Standing Seam
This mechanically seamed panel was first introduced by Butler Manufacturing, but has also been produced by a multitude of other manufacturers. Typically, the panel has a 24” coverage (A) with a rib height (B) of 3”. What varies by manufacturer with this panel is the configuration of the major rib (C & D) as well as different strength inducing enhancements in its pan (flat portion between the ribs).