Sagging asphalt garage roof

Guest User
3/12/2016
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!
Todd Miller
Isaiah Industries, Inc.
3/12/2016
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.

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