How To Install Metal Roofs Over Existing Asphalt Shingles?
I need to know the basics to install a ribbed metal roof on residential homes.
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Metal roofing can be installed directly on top of shingles. Metal installed directly over shingles may show the shape of the shingle through the flats of the metal, creating a problem appearance. Felt can be laid directly over the shingles and then covered with the metal. If the shingles are very flat this may hide the contour of the shingles. 30 lb. Felt will work better than 15 lb. Felt. Fan fold insulation applied directly over the shingles and under the metal will solve all but the worst shingle shape issues. If you are using a through-fastened panel the screws should be installed on top of the rib when installed over shingles.
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Metal roofing can be installed directly on top of shingles. Metal installed directly over shingles may show the shape of the shingle through the flats of the metal, creating a problem appearance. Felt can be laid directly over the shingles and then covered with the metal. 30 lb. Felt will work better than 15 lb. Felt. If the shingles are very flat this may hide the contour of the shingles. Fan fold insulation applied directly over the shingles and under the metal will solve all but the worst shingle shape issues. If you are using a through-fastened panel the screws should be installed on top of the rib when installed over shingles.
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I have seen metal roofing installed over shingles by first installing 1 X 4 wood strips and install installation between the strips.
Ed
Ed
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