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MeSome metal roof systems can be installed on curved roofs. The modular panel systems are generaly the most economical as standard roll formed sheets do not bend however there are companies that post form certain profiles to fit curves and some that custom roll form curves. Both are generally commercial heavier steel systmes and more expensive.
As to the curving back up, you are now beyond most metal products except the old method of using sheets of Galvaized steel and soldering the joints to make it a "Hydrostatic" roof system.
12/14/2004
Dura-Loc Roofing Systems, Inc.
12/15/2004