HYDRO Bitumen Window & Flashing Tape (Codemark Certified)

Product Description

Product Description

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

  • It’s suitable for timber and steel framed buildings 
  • 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’.


  • Compatible with all building wraps
  • 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


Technical Data

Scope of Use / Applications

Windows/Door/Timber & 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.

WARNING: Don’t apply any solvent-based glues or adhesives/sealants to the tape as it will react with the bitumen.