40 Below Platinum Flashing Tape

• Used to flash around windows and doors as a secondary water-resistant barrier. 

• To seal joints in rigid air barriers.

• At joinery heads to seal flashing upstands to the wall underlay. 

• Advanced poly-acrylic adhesive for an aggressive and dependable performance in temperatures from -10˚C to 40˚C.

• Distinctive silver aluminum facer, with excellent water resistance and a UV resistance of 180 days.

• Super ultra-thin and pliable, so there is no build-up in corners.

• CodeMark Certified and complies with the New Zealand Building Code.

• Nail and screw sealability to AAM-711.13

• Two layers are required on the sill for nail and screw sealability

• B2 Durability – B2.3.1(a), B2.3.2 

• E2 External Moisture – E2.3.2 (contributes to), E2.3.5 (contributes to), E2.3.6 (contributes to), E2.3.7 

• F2 Hazardous Building Material – F2.3.1 

• Masons Flashing Tapes are certified for use in buildings: 

a) within the scope of E2/AS1, and 

b) located in any wind zone up to and including Extra High, and 

c) located in any exposure zone (both as defined in NZS3604:2011 Timber framed buildings). 

• Masons Flashing Tapes shall be used in accordance with the 40 Below & Hydro Flashing Tape Installation Instructions, March 2021, and the requirements of Acceptable Solution E2/AS1. 

• Masons Flashing Tapes shall not be installed in areas where it has the potential to be exposed to heat, such as chimney flues. 
  

Windows/Door/Timber & Steel Frame Flashings

• Masons 40 Below™ Platinum Flashing Tape and Masons Corner Guards must be installed in accordance with the installation instructions downloadable from this page. Please also note:

• Ensure the 40 Below™ Tape completely covers the joinery opening.

• To ensure maximum adhesion of the tape, make sure the substrate surface is clean, dry, and free from any dust or other contaminants. Flaps are folded into the opening and secured.

• The building wrap is installed as shown on the exterior face of the frame. A window and door openings are cut at a 45˚ angle away from each corner, then the flaps are folded into the opening and secured.

• 40 Below™ Platinum Flashing Tape must not be stretched. When joining 2 sections of tape, overlap by 100mm or more.

• Compatible with most building sealants, check suitability with sealant manufacturers. Alternatively, do a patch test before use.

RIGID AIR BARRIERS – 40 Below™ is tested and approved for sealing the joints on Rigid Barriers. Tested and approved for use with BGC Durrabarrier and OS’BraceRAP.