How To Install Corrugated Metal Roofing Over Shingles. You can also drastically reduce the labor cost since you can cover more square feet with a single corrugated panel than you. Position the closure strips along the eave about one inch from the edge and stick them to the panels with butyl tape.
Attach your metal sheets to the framing. But the surprising thing was that a metal roof installed over a previous asphalt shingle installation fared worse with regards to dents in the metal. Use metal roofing screws to attach the shingles in place.