Sagging asphalt garage roof

I have an existing garage with an asphalt roof. The middle of the garage is sagging slightly from the weight. Will a metal roof be less weight than asphalt? Is it best to strip the asphalt off first before installing a metal roof? Thanks!		Guest User 3/12/2016	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/21046/find/
Asphalt shingles weigh from 275 - 425 pounds per 100 square feet. Steel roofing weighs from 80 - 125 and aluminum from 50 - 70. Some metal roofs, especially the more heavily contoured or formed ones, can be installed over old shingles. However, the sagging you see now will still be visible.		Todd Miller Isaiah Industries, Inc. 3/12/2016	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/21047/find/

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