With uneven surfaces, such as corrugated metal roofing, nailing strips can be used to even the surface. Then the sheets can be installed as over purlins. Also, because Ondura is more rigid than shingles, the problem of "telegraphing," or showing imperfections on the surface being covered, is eliminated.
Ondura re-roofs over practically anything. If you didn't choose Ondura for your original roof, it should be your obvious choice as a re-roof. The advantage of not having to tear off the existing roof makes re-roofing easier, faster, and cheaper. That's why Ondura is quickly becoming one of the most popular re-roofing materials ever.
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