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Masons 40 Below™ Flex Flashing Tape

Masons
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Masons 40 Below™ Flex Flashing Tape gallery detail image
Masons 40 Below™ Flex Flashing Tape gallery detail image
Masons 40 Below™ Flex Flashing Tape gallery detail image
Masons 40 Below™ Flex Flashing Tape gallery detail image
Masons 40 Below™ Flex Flashing Tape gallery detail image

Our most advanced, high performance flashing tape with cutting edge adhesive and a superior flexible facer. 40 Below Flex is ultra thin and pliable with high water resistance and maximum UV protection. It is nail and screw sealable with just one layer. May also be used on UNI and UNI FR for seam overlaps and head flashings and can also be used on HT Green.

Details
  • Category
    Flashing Penetrations
  • Range
    Masons 40 Below Flashing Tape
  • Warranty
    15 days
Specifications

NB. Masons 40 Below Flex Flashing Tape and Masons Corner Guards must be installed in accordance with the installation instructions found in our Document Downloads button on this page.

New Zealand Building Code Standard (NZBC)

  • For a risk score between 0-20 in accordance with NZBC Acceptable Solution E2/AS1 - PASS
  • B2 Durability, E2 External Moisture, and F2 Hazardous Materials. Reliable adhesion -10˚C to +40˚C
  • NZS3604 Building Wind Zones up to and including ‘Extra High’ AS/NZS 4201.4:1994
  • Tested to ASTM D3330 for adhesion and AAMA-711.5.21 for nail and screw sealability.
Scope of use

Windows/Door/Timber & Steel Frame Flashings

Masons 40 Below™ Flex 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™ Flex 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 to 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™ Flex 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 manufactures. Alternatively, do a patch test before use.

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

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Masons 40 Below Flex Flashing Tape is available in 4 roll sizes:

75mm x 20m, 100mm x 20m, 150mm x 20m and 230mm x 20m

Performance
  • Super-premium white facer
  • UV resistant for 270 days
  • Advanced, aggressive acrylic adhesive for superb performance
  • Ultra-thin and pliable, so no build-up in corners
  • Nail and screw sealable with one layer

Physical Properties

  • White facer
  • Works in temperatures from -10°C up to 40°C.
  • Compatible with all building wraps.
  • Compatible with most building sealants – check suitability with sealant manufactures. Alternatively, do a patch test before use.
  • UV resistance for up to 270 days
  • Layers on sill for nail and screw sealability: 1
  • Codemark certified.
For enquiries, complete the contact form below or call us on 0800 522 533.
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About the
Seller

We’re Masons – a New Zealand owned family business that’s been part of the building industry for more than 25 years. We develop products and systems that help buildings, and the people that make them, perform at their best.

Masons was built from practical experience. Trent Mason learned the trade in a bricklaying family, where doing the job properly mattered. When he moved to New Zealand at the age of 19, he brought that same mindset to the building site – always looking for better products and systems to make the job easier for the people around him.

That approach still motivates us. We focus on the complete building envelope and how each component interacts with the next. Wraps, air barriers, fixings, tapes, cladding elements – everything works better when it works as a system. Our goal is to reduce risk and remove guesswork so buildings perform the way they should.

Over the years we’ve become known as trusted problem-solvers – the people you call when you want something explained clearly, when you need to understand how components connect, or simply want confidence you’re making the right call.

We’re here to help make building smarter, simpler and more reliable – with great products, great systems and great people.

Masons. Delivering products and systems to build smarter.

Masons
Masons 40 Below™ Flex Flashing Tape

Masons