Thermaflash window flashing tape can be used as a flexible flashing system around window and door joinery openings on timber and steel framed buildings within the following scope:

• Installed into and around joinery openings over the wall underlay and exposed frame to cover both the face and edge of the opening as a secondary weather resistant barrier
• Installed at joinery heads to seal flashing upstands to the wall underlay
• To assist the overall weathertightness performance of window and door joinery installations
• To be used in conjunction with air seals and joinery flashing systems. Installer must check for air seal product compatibility with Thermaflash
• Situated in NZS3604 Wind Zones up to, and including, ‘Extra High’
• Suitable for residential builds (E2/AS1 timber framed and E2/AS4 steel framed) and medium rise buildings (E2/VM2)

Thermaflash window flashing tape has been appraised by BRANZ as a flexible system for use around window and door joinery for buildings with the following scope:

• Constructed with timber and steel framing in accordance with scope limitations of NZBC Acceptable Solution E2/AS1 and NASH Building Envelope Solutions, Paragraph 1.1
• With a risk score of 0-20, calculated in accordance with NZBC Acceptable Solution E2/AS1 or NASH Building Envelope Solutions, Table 2
• With wall cladding systems complying with NZBC Acceptable Solution E2/AS1 or NASH Building Envelope Solutions, or a valid BRANZ Appraisal that specifies a flexible flashing system
• With flexible wall underlays compatible with the flashing tape and complying with the NZBC 

• Must not be exposed to the weather/UV for more than 180 days
• Thermaflash should be installed when temperatures are above -10°C
• Thermaflash is not designed to overcome poor detailing and workmanship of the window or door joinery installation
• Most window sealants will bond directly to Thermaflash. However, Installer must check the bonding strength and chemical compatibility of the sealant and tape before installation
• When Thermaflash is used with rigid air barrier or rigid wall underlay products, follow the flashing tape installation instructions set out by the rigid air barrier or rigid wall underlay product supplier. Building designer/specifier/installer must check with the rigid air barrier or rigid wall underlay product supplier to ensure that Thermaflash window flashing tape is fully compatible and is warranted with their product system.

• Clause B2 DURABILITY: Performance B2.3.1 (b), 15 years and B2.3.2. Thermaflash Flashing Tape meets these requirements
• Clause E2 EXTERNAL MOISTURE: Performance E2.3.2. Thermaflash Flashing Tape contributes to meeting this requirement
• Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. Thermaflash Flashing Tape meets this requirement and will not present a health hazard to people

When Thermaflash is used and installed in accordance with Thermakraft literature and BRANZ Appraisal:

• Thermaflash window flashing tape will meet or contribute to meeting the performance requirements of NZBC Clauses B2 Durability, performance B2.3.1 [b], 15 years* and B2.3.2*, E2 External Moisture, and F2 Hazardous Building Materials. Further details can be found in the BRANZ Appraisal.

* Note: When the external cladding is maintained according with the cladding manufacturer’s instructions and the cladding remains weather resistant, Thermaflash window flashing tape is expected to have a serviceable life equal to that of the cladding.

• Thermaflash window flashing tape is expected to have a serviceable life equal to that of the cladding, provided Thermaflash is not exposed to the weather or ultra-violet (UV) light for more than 180 days, or damaged upon installation.
• Thermaflash window flashing tape is designed to work on building underlays that meet the requirements of NZBC E2/AS1 Table 23, and on all Thermakraft BRANZ Appraised wall underlays.