A properly installed metal roof will last 40 to 70 years. Friends of ours in Tennessee had a metal roof installed on their house. It did cost more than asphalt shingles but when you consider how long they last it is worth it. The roof was imprinted to look like regular shingles, and at a casual glance you couldn't tell it was metal. The metal roofs don't look like the silver corrugated metal used on a barn. I don't understand the resistance in TV to metal roofs. Is some one getting kick backs on roof replacements? I can't think of any other reason.
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