Technical Statement
Product Description
350mm diameter flexible foil tube for small internal spaces. Recommended length up to 1.2m. Flat glass roof unit with integrated flashing system.
Scope of use
For roof pitches of 15-60 degrees. Not suited to tray or membrane roofs. Can not use custom-made flashings.
TWF Sun Tunnels do not have a fire rating.
New Zealand Building Code (NZBC)
The product will, if employed in accordance with the supplier's installation and maintenance requirements, assist with meeting the following provisions of the building code:
- Clause B2 Durability: Performance B2.3.1, B2.3.2
Product is CodeMark certified. (BRANZ CM-1010)
- Clause E2 External moisture: Performance E2.3.1, E2.3.2, E2.3.7
Product is CodeMark certified. (BRANZ CM-1010)
- Clause G7 Natural light: Performance G7.3.1, G7.3.2
Product is CodeMark certified. (BRANZ CM-1010)
- Clause H1 Energy efficiency : Performance H1.3.1, H1.3.2E, H1.3.3
Product is CodeMark certified. (BRANZ CM-1010)
Notes
B2/AS1 Durability - AS 4285 - VELUX Skylights satisfy
the durability requirements specified for Non-structural Roof Cladding elements
and External Window/Door Joinery.
C3 Protection from Fire - AS 1530 - VELUX Skylights have
been classified as “non-combustible” according to AS 1530 test methods.
E2 External Moisture - AS 4285 - VELUX Skylights have
passed tests for weather tightness, concentrated load, non-cyclonic and
cyclonic wind pressures according to Australian Skylight Standard AS4285 test
methods.
F2 Hazardous Building Materials - NZS 4233: Part 4, AS/NZS 4666
- VELUX Skylights comply with requirements for sloped Insulating Glass Units.
G7
Natural Light requirements. Can be used as alternative solution to meet minimum light levels
H1 Energy Efficiency - NZS 4218 - VELUX Skylights exceed the
minimum R-value requirements for skylights in all climate zones.
Evidence
The product meets the requirements set out in the following documents, or relevant parts of cited standards within the documents:
- B2/AS1 Durability - AS 4285 - VELUX Skylights satisfy the durability requirements specified for Non-structural Roof Cladding elements and External Window/Door Joinery. VELUX Skylights have passed tests for weather tightness, concentrated load, non-cyclonic and cyclonic wind pressures according to Australian Skylight Standard AS4285 test methods.
- E2 External Moisture - AS 4285 - VELUX Skylights have passed tests for weather tightness, concentrated load, non-cyclonic and cyclonic wind pressures according to Australian Skylight Standard AS4285 test methods.
- F2 Hazardous Building Materials - NZS 4233: Part 4, AS/NZS 4666 - VELUX Skylights comply with requirements for sloped Insulating Glass Units.
- G7 Natural Light - VELUX Skylights can be used to meet the G7 Natural Light requirements.
- H1 Energy Efficiency - NZS 4218 - VELUX Skylights exceed the minimum R-value requirements for skylights in all climate zones.
- Evidence: 30+ years of historical use in New Zealand
Supporting evidence
The product has and can make available the following additional evidence to support the above statements:
Use in Service History
15+ years in New Zealand
Product Criteria
Design requirements
TWF Sun Tunnels are modular fixed, non-venting tubular skylights intended
for roof pitches between 15 and 60 degrees. They are available in 350mm diameter tubes only.
The polyurethane roof unit has 4mm thick toughened glass and an integrated flashing suitable for corrugated and trapezoid profile metal roofing, metal and concrete/clay tiles.
TWF Sun Tunnels do not have a fire rating.
Installation requirements
Install TWF Sun Tunnel in accordance with
instructions supplied with the product and local building code
requirements. 453842-TWF_TLF - 2020-09.indd (azureedge.net). Align Sun Tunnel with the trim opening, free of warp or twist, maintaining dimensional
tolerances. Attach skylight to the trim-out frame with screws furnished by
manufacturer. Coordinate attachment and seal of perimeter air and vapor barrier
material.
To ensure there no gaps tape between the flexible tubing and the roof unit and diffuser seal all joints with 'silver' tape provided.
Maintenance requirements
For maintenance requirements refer to http://https//www.velux.co.nz/service-and-warranty/maintenance.
Exterior surfaces must be cleaned with clean water at least once
a year, subject to the environmental conditions present.
