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Masons 40Below window flashing tape is a self adhesive flashing tape for use around framed openings in timber and steel framed buildings.


  • Compatible with all building wraps
  • Works in temperatures from -40°C up to 65°C, no need for primer spray or heat guns
  • Extremely thin only 0.2mm, allows for easier fitting of windows and doors
  • Passes nail seal ability to ASTM D3330 and is suitable as a single layer application over timber frame
  • An Optional Corner Guard is easy to install and increases protection to framing


Available Sizes:
75mm x 20m
100mm x 20m
150mm x 20m
200mm x 20m


Masons Corner Guards are optional to use with the installation of Mason 40 Below™ or Hydro™ Window Flashing Tapes.

Masons 40 Below Flashing Tape

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