Metal Roof Installation Over Asphalt Shingles
There was some hail damage to my 19-year-old asphalt-shingled roof last summer and I am considering a standing-seam metal roof, with the idea of thin-film solar panels affixed in between the seams sometime in the future. I am in the process of getting bids for the roof and have the below question:
Almost all the contractors are proposing roofing over the existing asphalt-shingles to avoid the extra cost involved with a tear-down of the shingles. Could this present problems in the present or the future? Could the asphalt rot before the metal roof is due for replacement decades from now?
Thanks in advance.
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