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Vented Wall Batten VB20

The VENT Wall Cavity Batten consists of extruded fluted battens designed use as non-structural cavity battens in cavity-based wall cladding systems. The VENT Wall Cavity Batten is designed for use with timber framed buildings. 

VENT Wall Cavity Battens create a 20mm cavity, providing a secondary means of weather resistance by separating the cladding from the external wall framing, as well as providing an unobstructed path for occasional ingress of water that may get past the external skin to drain to the exterior of the building. Also suitable for use in the roof cavity.

Key Features
  • Convenient peel-off adhesive backing eliminates the need for nails or glue
  • Adheres to timber, metal and building wraps
  • Insect proof — 4mm vents prevent ingress of nesting insects
  • Provides passive airflow of 16,000mm² per linear metre
  • Easy to install — manufactured in 1800mm lengths for easy handling
  • Ventilated polypropylene structure is strong and robust
  • Perfect design for drainage for occasional ingress of water
  • Also suitable for use in the roof cavity
  • 30 year warranty
Recycled Content (Pre-Consumer)
Pre-Consumer Recycled Content
Scope of Use

The VENT Wall Cavity Batten has been appraised for use as a non-structural cavity batten for use with non-structural wall cladding systems on timber framed buildings with the following scope:

  • the scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1; and 
  • with a risk score of 0-20, calculated in accordance with NZBC Acceptable Solution E2/AS1, Table 2; and
  • with cavity-based wall cladding systems complying with NZBC Acceptable Solutions E2/AS1 or a valid BRANZ Appraisal that specifies a nominal 20mm (minimum 18mm) drained and vented cavity; and
  • situated in NZS 3604 Wind Zones up to and including Extra High

Note: The VENT Wall Cavity Batten can also be used on buildings subject to specific weathertightness design. Weathertightness design and detailing of these installations is the responsibility of the designer and is outside the scope of the BRANZ Appraisal.

  • Also suitable for use in the roof cavity.


Limitations on Use
  • The VENT Wall Cavity Batten is not suitable for use where pressure equalised cavities are required
  • The VENT Wall Cavity Batten can be used with steel framed buildings provided a thermal break is also installed
  • The VENT Wall Cavity Batten on its own can not be considered a thermal break
Statement of Building Code Compliance

The VENT Wall Cavity Batten if designed, used and installed and maintained in accordance with the statements and conditions specified in the VENT technical documentation and BRANZ Appraisal 1099, will meet or contribute to meeting the following provisions of the NZBC:

  • Clause B! STRUCTURE: Performance B1.3.1, B1.3.2 and B1.3.4 VENT Wall Cavity Batten meets the requirements for loads arising from wind and impact (i.e. B1.3.3 (h) and (j)). See Paragraphs 8.1 - 8.3 of BRANZ Appraisal 1099
  • Clause B2 DURABILITY: Performance B2.3.1(b), 15 years and B2.3.2 VENT Wall Cavity Batten meet these requirements. See Paragraph 9.1 to 9.3 of BRANZ Appraisal 1099
  • Clause E2 EXTERNAL MOISTURE: Performance E2.3.2 VENT Wall Cavity Batten when used to form a drainage cavity behind a cladding system will contribute to meeting this requirement. See Paragraphs 12.1 - 12.5 of BRANZ Appraisal 1099
  • Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1 VENT Wall Cavity Batten meets this requirement and will not present a health hazard to people.
In-Service History

 The VENT VB20 has been used as a vented roof batten over a thousand of residential and commercial projects across New Zealand since 2015. Following growing demand from architects and installers to use the batten in wall applications, VENT has now had the VB20 BRANZ appraised for use as a wall cavity batten.

Other Performance Attributes
  • 30 year warranty
  • Insect proof — recommended 4mm vents to prevent ingress of nesting insects
  • Manufactured in recycled plastic 
Data Sheet: VB20 Wall


Appraisal, Accreditation, Certification and Testing


Maintenance and Warranty




Video: Why Is Passive Roof Ventilation Necessary


CAD/PDF Details
VB20 Vented Batten Profile


VB20 Vented Batten Construction


VB20 Vented Batten Setout: Horizontal Cladding Layout


VB20 Vented Batten Setout: Vertical Cladding Layout


VENT provide complete passive ventilation systems that ensure healthy homes free from internal moisture and condensation.

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