Masons 40 Below Flashing Tape 150mm x 20m



40 Below™ Flashing Tape is a self adhesive flashing tape to seal around windows, doors, and other joinery openings as a secondary defence against water penetration.



  • Incredible adhesion in all conditions.
  • Simple 4 step installation, save time reducing costs.
  • Reliable and dependable weather tightness.
  • An Optional Corner Guard is easy to install and increases protection to framing.
  • RIGID AIR BARRIERS – 40 Below is tested and approved for sealing the joints on Rigid barriers. Tested and approved for use by: BGC Durabarrier and OS’BraceRAP.
  • NB. Masons 40 Below Flashing Tape and Masons Corner Guard must be installed in accordance with the installation instructions.
  • New Zealand Building Code Standard (NZBC)
  • Has been CodeMark Certified by Certmark International.
  • For a risk score between 0-20 in accordance with NZBC Acceptable Solution E2/AS1.
  • Passed NZS3604 Building Wind Zones up to and including ‘Extra High’.
  • Passes nail seal ability to ASTM 1970-01 section 7.9.
  • New smooth white facer tape also passes screw sealablity to AAMA 711-13.
  • Suitable as a single layer application over timber frame


Physical Properties

  • Extremely thin only 0.2mm, allows for easier fitting of windows and doors.
  • Works in temperatures from -40°C up to 65°C.
  • Compatible with most building wraps.
  • Compatible with most building sealants – check suitability with sealant manufactures. Alternatively do a patch test before use.


SIZE: 150mm x 20M





Brand Masons

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