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https://www.metalroofing.com/spirit/comment/3735/find/
Metal roofing is very low weight -- ranging from about 45 pounds per square for aluminum to 85 - 145 for steel. Asphalt shingles, on the other hand, weigh from 275 - 425.
Most building codes allow for two layers of roofing but you should double check yours.
Metal is frequently used as a second layer. many of the residential products are designed specifically for re-roofing.
8/16/2004
8/16/2004