Traditional Roof Mono Pitch 5°

Colourbond Traditional Mono-Pitched Roof <10°

The National Construction Code 2022 Vol 1: F8D5 / ABCB Housing Provisions Standard 10.8.3 for a Traditional Mono-Pitched Roof <10° requirement mandates “25,000mm²/lm at opposing ends of the roof.

Achieving this standard is flexible, with various solutions available depending on your roof design and construction preferences.

Our G2500N Over Fascia Vent 25mm guarantees a calculated airflow of 25,000mm² per linear metre, ensuring compliance effortlessly.

For those seeking alternatives for ventilation at the eaves, consider the G1200N and VB20 Combination:

  • G1200N Over Fascia Vent 10mm: Provides calculated airflow of 11,000mm²/lm.
  • VB20 Ventilation & Drainage Batten 20mm: Offers calculated airflow of 14,500mm²/lm.

Combining these products yields a total of 25,500mm²/lm, surpassing the NCC minimum requirement of 25,000mm²/lm

Either solution provides peace of mind for your project’s compliance needs.

 

Recommended Product Combination for Colourbond Traditional Pitched Roof <10°

G2500N

Over Fascia Vent 25mm

The VENT Over Fascia Vent – G2500N is the most practical and cost-efficient method of ventilating the Eaves for cathedral and traditional roofs with pitches <15 degrees. It is easy to install, discrete and compatible with either timber or metal fascias.

  • 25,000mm²/lm of free airflow
  • Meets NCC DTS requirements
  • Releases hot air from roof voids and manages condensation
  • The only solution to ventilate builds with no eaves
  • Can be used in isolation or as part of a passive ventilation system
  • Can be used to form part of a passive ventilation system that works year round with no moving parts or energy consumption.
  • Easy to install
  • Not visible as hidden by spouting/gutter

G1200N

Over Fascia Vent 10mm

The VENT Over Fascia Vent – G1200N is the most practical and cost efficient method of ventilating the Eaves of traditional roof pitches ≥ 15°. However, for roof pitches <15° the G1200N can be used together with the VB20 batten to ensure compliance with NCC airflow requirements for roof pitches <15°. It is easy to install, discrete and is compatible with either timber of metal fascias.

  • 11,000mm²/lm of free airflow
  • When combined with the VB20 Ventilation & Drainage Batten can achieve 25,500mm²/lm of free airflow
  • Meets NCC DTS requirements
  • Releases hot air from roof voids and manages condensation
  • Easy to install
  • Not visible as hidden by spouting/gutter
  • The only solution to ventilate builds with no eaves
  • Can be used in isolation or as part of a passive ventilation system
  • Works year round with no moving parts or energy consumption

*Note: for combinations see VENT System technical drawings

VB20

Ventilation & Drainage Batten 20mm

The VENT Roof cavity batten – VB20 is a 20mm Polypropylene Ventilation and Drainage Batten designed to facilitate 14,500mm²/lm of free airflow through a cathedral roof, between the roofing underlay and roof battens or purlins. Reducing the risk of insulation blocking these tight roof cavities.

However, for roof pitches <15°, by placing the VB20 behind the fascia it can be used together with the G1200N batten to ensure compliance with NCC airflow requirements for roof pitches <15°.

  • 14,500mm²/lm of free airflow
  • When combined with the G1200N Over Fascia Vent, can achieve 25,500mm²/lm of free airflow
  • Meets NCC DTS requirements
  • Facilitates movement of hot air through and into roof voids
  • An alternate solution to using larger Over Fascia Vents
  • Can be used in isolation or as part of a passive ventilation system
  • Works year round with no moving parts or energy consumption

*Note: for combinations see VENT System technical drawings

For more info on these products, get in touch with us