I have a 20 year gray roof. It is not missing any shingles, even after Sandy. Edges are not curling up or have missing pieces.
The roof looks horrible. It is mostly black or looks dirty. What would be the cause of this?
Any hardware, Wal-Mart, box store will have it.
Keep in mind on a 20 year old roof it's going to do more damage then good, and most likly will just return again.
Go trying to pry up shingles that old to install copper or zinc strips will be almost sure the break some.
Any new shingles installed will have a midicide in the granual mix, mostly likly copper.
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