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      Can the 8 ft. SM-Rib Galvalume Steel 29-Gauge Roof/Siding Panel be installed over shingles ?

      We do not recommend installing the 8 ft. SM-Rib Galvalume Steel 29-Gauge Roof/Siding Panel over shingles

      We do not recommend installing the 8 ft. SM-Rib Galvalume Steel 29-Gauge Roof/Siding Panel over shingles because if moisture and heat gets trapped in between the existing roof and metal roof, it can cause rot and mold.