We want to put a new metal roof over an existing asphalt shingle roof. There is only one layer of shingles. Some people have said that we need wood firring strips, but I'm don't see why. Can't the metal be screwed down to the existing shingles? Do we need felt paper between the shingles and the metal? If we do need firring strips, what would be their purpose? Thanks, Henry
- posted
19 years ago