Tray Roofing

Standing Seam or Tray roofing is similar to trough section in that it is secret fixed, but it consists of just a single pan per sheet, compared to the two or three pans of a trough section.

Tray roofing may be designed to be self-supporting on purlins, or installed on solid sarking. With the former, sheets clip together, the latter has its side ribs clipped to the adjacent sheet.

Tray roofing designed to be fully supported by sarking is referred to in the COP as standing seam roofing. Clauses in this section headed Tray Roofing will apply to both types, clauses headed Standing Seam Roofing, including Load/Span tables, will only apply to generic standing seam roofing profiles

The profiles and fixing methods for tray roofing date back to traditional methods used to hand-fabricate metal roofs, predominantly in Europe and often from non-ferrous metal, prior to the development of roll forming technology. A by-product of this heritage is that, in addition to the secret clips fastening the main roof, flashings should also be installed on clips with minimal use of exposed rivets and fasteners.

In Europe, the installation of tray roofing is done by Spenglers, who serve a 4-year apprenticeship. We do not have the same qualification in NZ, but installers of tray roofing must have specific training and experience in the product if they are to achieve the expected high standard of workmanship