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Rubber roofs are very easy to apply with no flaws, are very durable (flexible) and are sealed better at any joints with low maintenance over a long period. The metal roofs were difficult to handle in both shipping and application, not that easy to form to the mold of the roof and difficult to seal as metal characteristics expand and contact at a very high rate with huge differences in temperatures in North America, ( we were always recaulking vents and joints on metal roofs to avoid leaks)..
Many metal roofs on RVs were damaged in the Northern areas with hail storms where insurances companies picked up the tab to reroof. Probably many more that I missed. Ellis
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