How to install metal roofing over existing shingles with 100% working
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The first is to apply an approved underlayment over the old shingles. The metal roof must rely on the building’s framework for full support. This will help prevent water leakage and provide a buffer between the metal roof and the existing shingles.
The second way to install a metal roof over a shingle roof is with the use of purlins or battens.
In a standing seam roof, long, single panels run vertically all the way from the eave to the ridge. This is the fastest way to install but it doesn’t provide the flattest surface for metal roofing installation. Start with an underlayment over the existing shingles: If you want to install steel over asphalt, your best choice for installing metal roofing is to use a steel shingle system like the one shown instead of the more common (and more expensive) standing seam steel.
