The VENT Systems Ventilation & Drainage Batten 20mm – VB20 is a Polypropylene batten designed to facilitate passive airflow through skillion or cathedral roof cavities. Placing the VB20 on top of the roof battens, under the roofing underlay or membrane ensures airflow is unimpeded by insulation pushed into the roof cavity. The VB20 ensures airflow above the roof batten ensuring no moisture can be trapped in this area that has low air velocity.

The VB20 can be used to create a 20mm separation gap between the Colourbond roof and the vapour permeable membrane that prevents the transfer of dew point from the underside of the colourbond roof to the underside of the roofing underlay or membrane.

The VB20 can be used to establish a 20mm ventilation and drainage cavity behind lightweight wall cladding.


  • Far exceeds Australian Standards, with a compression strength of 1,320Kpa
  • Insect proof – 4mm vents prevent ingress of nesting insects.
  • Provides passive airflow of 14,500mm² /lm
  • Recommended for skillion or cathedral and trussed roofs.
  • Commercial and residential applications.
  • Ensures Ventilation & Drainage Cavities in walls and roofs
  • Prevents dew point transference
  • Create ventilation and drainage cavity behind light cladding
  • Easy to install with adhesive strip
  • Manufactured in 1800mm lengths for easy handling.
  • Tested to AS1530.3
    • Spread of flame index 6
    • Smoke developed index 2