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Hydro Flashing Tape

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

Key Features
  • Compatible with all building wraps and suitable for timber and steel framed buildings.
  • Simple 4 step installation, save time reducing costs
  • 1.4mm thick adhesive layer.
  • Reliable and dependable weather tightness
  • Low temperature adhesion 
  • Can be applied as low as 5°C
  • Corner Guard is easy to install and increases protection to framing
NZ Made
NZ Made
NZ-Owned Business
NZ-Owned Business
Scope of Use

Windows/door/timber and steel frame flashings

  • Masons Hydro Flashing Tape and Masons Corner Guard must be installed in accordance with these instructions. Ensure the Hydro 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. At window and door openings it is cut on a 45˚ angle away from each corner, then the flaps are folded into the opening and secured.
  • Hydro Flashing Tape must not be stretched. When joining 2 sections of tape, overlap by 100mm or more. 

Note: 150mm wide tape is used for 100mm wide window or door framing. 200mm wide tape is used for 140mm - 150mm wide revels.

NZS 3604 Wind Zone Very High suitable
Very High WInd Zone
Statement of Building Code Compliance

Masons Thermalcrete HYDRO Flashing Tape has been evaluated by Certmark as meeting the following provisions of the NZ Building Code:

  • B2 Durability: B2.3.1(a) - not less than 50 years; and B2.3.2
  • E2 External Moisture: E2.3.2
  • F2 Hazardous Building Materials: F2.3.1
Other Performance Attributes
  • Has been tested and passed by CodeMark for a risk score between 0-20 in accordance with NZBC Acceptable Solution E2/AS1.
  • Passed NZS3604 Building Wind Zones up to and including ‘Very High’.
E2 External Moisture compliant
External Moisture
Appraisal, Accreditation, Certification and Testing
Appraisal, Accreditation, Certification and Testing
Installation and Operation
Maintenance and Warranty

Since being established in 1999, Masons has become a key supplier in the New Zealand building industry, offering a variety of quality products and tools for a whole range of building requirements.

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