A.Daniel C. Jandzio, wood frame product manager at Fabral, a metal roofing manufacturer, responds: Regular metal roofing panels can often be installed in a curved application, depending upon the panel profile chosen and the radius of the curved roof. The minimum radius is 24 feet for through-fastened steel panels and 18 feet for through-fastened aluminum panels.

Standing-seam panels usually require a much larger radius — between 100 and 200 feet — for successful installation without pre-curving.

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