If you did not choose Ondura® for your original roof, consider it when faced with re-roofing a structure. The advantage of not having to tear off the existing roof makes re-roofing easier, faster, and less expensive. That is why Ondura® has become one of the most popular re-roofing materials.

18-jpegOn shingle roofs, Ondura® can be applied over up to two layers of shingles if the roof has a solid nail base and if the surface is relatively smooth. No preparation is necessary. Simply nail Ondura® sheets or tiles in place. With uneven surfaces, such as corrugated metal roofing, nailing strips can be used to even the surface and then the sheets can be installed over purlins. Ondura® is more rigid than shingles so no imperfections will show.

You don’t have to tear-off your old roof, simply cover it with Ondura®. It is easy for both Do-It-Yourselfers and contractors. There is no expensive tear-offs or the fees associated with hauling and dumping old roofing materials, so you save money!

33Ondura® vs. Shingles in Re-Roofing Applications

Shingles are one of the most commonly used roofing products, however they have numerous weaknesses. Shingles are generally only warrantied when applied by a certified installer. They can usually only be installed over only one layer of shingles so there is expensive tear-off and disposal of old shingles or other roofing materials. And, shingles are difficult to patch.

  • Is supported by a Lifetime Limited Warranty.
  • Is Easy to install using common tools and the Ondura® Installation Guide.
  • Can be applied over existing roofing, including up to two layers of shingles, metal, and wood without a tear-off.
  • Eliminates the expenses linked with removing existing roofing (and reduces landfill waste).
  • Is lightweight (81 lbs. per 100 square feet). It will not overburden structures. Shingles can weigh 210-360 lbs. or more per 100 square feet.

Ondura® vs. Metal in Re-Roofing Applications

Though regarded as one of the most durable types of roofing, metal is not without its limitations. Special tools and skills are required for cutting and installing metal, plus the edges of sheets are sharp and require extra precaution. Extra care also has to be taken not to install different types of metals in contact with one another (such as galvanized steel and steel coated with zinc), as incompatible materials can cause rapid corrosion.

  • Does not require special tools—it can be cut with a utility knife or circular saw.
  • Has no sharp edges, meaning it won’t cut hands or clothing during installation.
  • Re-roofs directly over most existing roofs with no tear-offs, while re-roofing with metal often requires removal of the existing roof.
  • Has an in-depth Installation Guide that walks you through every aspect of installation.
  • Is lightweight (only 18 lbs. per sheet) for easy handling.
  • Is backed by a Lifetime Limited Warranty