we had a corrugated metal roof on our shop. rusted and started leaking. had a roofing company frame around edges and in to 8' wide sections. they put 4' x 8' x 2" thick insulation down to cover steel. then glued down rubber roofing material. its lasted about 8 years now with no maintenance. its a black material. he told me they make it in white also. i'm going to put white on my motorhome when i get that far. he said he would sell me material at cost had help me at no cost. 102" wide and 31' long would be about $500.00.
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