I did my roof last fall with metal. It was an easy install, the only hard part is lining up the first sheet. It was much faster than shingles and it goes right over what you have if your roof is steep enough. Mine is about 45 degrees so snow slides right off it. Each side is 45x22 and it took us 2 days including the ridge cap, flashing around the chimneys and all the trim work around the edges. I did rent a lift due to the pitch of the roof and it was a fairly simple job. Just make sure who ever you have do your roof uses long enough screws, they are available in lengths up to 3 inches but you have to order longer ones from a roofing supply company, places like Lowes and Home Desperate don't carry anything longer than 2 inches.
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