85mm x 85mm Int/Ext Corner Flashing RDCS85

Building corners are prone to water leakage due to shrinkage of corner boards, wind exposure, and leaky gutters. Installation of corner flashings is, therefore, a requirement of the NZBC to ensure weather tightness and prevent building deterioration.

  • Category
    Flashing Penetrations
  • Range
    Masons E2 Flashings

Redways uPVC Corner Flashings are available in 3 sizes (55mm x 55mm, 85mm x 85mm, and 105mm x 105mm) and are a simple, yet effective flashing solution. All corners are 2.7m in length. An additional advantage of the Redway design is that every corner flashing is reversible and therefore can be used as either an Internal or External corner, giving the installer added flexibility in usage.

Each Corner should be installed behind the cladding in either a direct fix or cavity situation as seen in the example detail on the right.

Internal Flashings

Internal flashings to deflect & drain moisture at key joints & penetrations.

While leaks primarily occur around windows and doors, they also occur at other joints and penetrations of the cladding and trim. The NZBC, therefore, requires flashings to be installed in order to ensure weather tightness and maintain the overall health of the building.  Internal flashings provide a moisture barrier and drainage plane that prevent moisture build-up and deflect moisture to the building exterior.  All Redway Internal flashings are manufactured from corrosion-resistant, UV-protected uPVC, and are available from all leading building merchants.


  • All Internal Flashings are manufactured from rigid uPVC and are supplied in 2.7m lengths unless stated otherwise.
  • All products are biologically and chemically resistant to treated materials such as framing timber. They will not rust nor react in salt zones.
  • The uPVC compound is stabilised for UV protection as required by the NZBC.
  • It is lightweight allowing for easy transportation and installation.
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Masons provide a range of quality trade building products from a complete Enclosure Building Wrap System and Exterior Cladding, to Brick Reinforcement, and are a crucial supplier in the New Zealand building industry.

Masons strive to be at the forefront of developing innovative products that raise the standards of New Zealand building products.