Roof Pitches

Solutions for all roof designs

Calculated, continuous, unimpeded passive ventilation is a critical ingredient in the essential ventilation of a building. Using tried and tested international proven best practice, VENT Systems Airflow calculations are determined by the pitch and type of roof and exceed minimum National Construction Code Vol 2, Part 10.8.3 requirements.

VENT Systems Recommended airflow calculations and product combinations:

  • Colourbond Traditional Pitched Roof <10°° – A calculated airflow of 25,000mm² per linear metre at opposing ends of the roof.
  • Colourbond Traditional Mono-Pitched Roof <10° – A calculated airflow of 25,000mm² per linear metre at opposing ends of the roof.
  • Colourbond Traditional Pitched Roof ≥10° – 15° – A calculated airflow of 25,000mm² per linear metre at the eaves and 5,000mm² at high level.
  • Colourbond Traditional Mono-Pitched Roof ≥10° – 15° – A calculated 25,000mm² per linear metre at the eaves and 5,000mm² at high level.
  • Colourbond Traditional Pitched Roof ≥15° – 75° – A calculated 7,000mm² per linear metre at the eaves and 5,000mm² at high level.
  • Colourbond Traditional Mono-Pitched Roof ≥15° – 75° – A calculated 7,000mm² per linear metre at the eaves and 5,000mm² at high level.
  • Concrete Tile Traditional Pitched Roof ≥15° – A calculated 7,000mm² per linear metre at the eaves and 5,000mm² at high level.
  • Colourbond Cathedral Pitched Roof ≥10° – 7,000mm² per linear metre at the eaves and 5,000mm² at high level, plus an additional 18,000mm²/m at the eaves if the roof has a cathedral ceiling.
  • Colourbond Cathedral Mono-Pitched Roof ≥10° – 7,000mm² per linear metre at the eaves and 5,000mm² at high level, plus an additional 18,000mm²/m at the eaves if the roof has a cathedral ceiling.

When applying in BAL Rated areas application of BAL Rated mesh must be done so, ensuring compliance with AS3959. Final approval should be sort from a qualified Fire Engineer or consultant.

Colourbond Traditional Pitched Roof <10°

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

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 10,000mm² per linear metre.
  • VB20 Ventilation & Drainage Batten 20mm: Offers calculated airflow of 16,000mm² per linear metre.

Combining these products yields a total of 26,000mm² per linear metre, surpassing the NCC minimum requirement of 25,000mm²

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

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 per linear metre at opposing ends of the roof.

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 10,000mm² per linear metre.
  • VB20 Ventilation & Drainage Batten 20mm: Offers calculated airflow of 16,000mm² per linear metre.

Combining these products yields a total of 26,000mm² per linear metre, surpassing the NCC minimum requirement of 25,000mm²

Traditional Roof Pitch +10
Colourbond Traditional Pitched Roof ≥10° – 15°

The National Construction Code 2022 Vol 1: F8D5 / ABCB Housing Provisions Standard 10.8.3 for a Traditional Pitched Roof <10° requirement mandates “25,000mm² per linear metre at the eaves and 5,000mm² at high level.”

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

For High level ventilation The RV10 range of ridge vents that meet minimum NCC requirements for high level ventilation.

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

  • G1200N Over Fascia Vent 10mm: Provides calculated airflow of 10,000mm² per linear metre.
  • VB20 Ventilation & Drainage Batten 20mm: Offers calculated airflow of 16,000mm² per linear metre.

Combining these products yields a total of 26,000mm² per linear metre, surpassing the NCC minimum requirement of 25,000mm²

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

Colourbond Traditional Mono-Pitched Roof ≥10° – 15°

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 per linear metre at the eaves and 5,000mm² at high level.”

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

For High level ventilation The RV10 range of ridge vents, can be easily adapted to create an abutment or barge vent, that meet minimum NCC requirements for high level ventilation

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

  • G1200N Over Fascia Vent 10mm: Provides calculated airflow of 10,000mm² per linear metre.
  • VB20 Ventilation & Drainage Batten 20mm: Offers calculated airflow of 16,000mm² per linear metre.

Combining these products yields a total of 26,000mm² per linear metre, surpassing the NCC minimum requirement of 25,000mm²

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

Colourbond Traditional Pitched Roof ≥15° – 75°

The National Construction Code 2022 Vol 1: F8D5 / ABCB Housing Provisions Standard 10.8.3 for a Traditional Pitched Roof ≥15° – 75° requirement mandates “7,000mm² per linear metre at the eaves and 5,000mm² at high level.”

Our G1200N Over Fascia Vent 10mm guarantees a calculated airflow of 10,000mm² per linear metre, ensuring compliance effortlessly.

For High level ventilation The RV10 range of ridge vents that meet minimum NCC requirements for high level ventilation.

Mono Pitched Traditional +15
Colourbond Traditional Mono-Pitched Roof ≥15° – 75°

The National Construction Code 2022 Vol 1: F8D5 / ABCB Housing Provisions Standard 10.8.3 for a Traditional Mono-Pitched Roof ≥15°-75° requirement mandates “7,000mm² per linear metre at the eaves and 5,000mm² at high level.

Our G1200N Over Fascia Vent 10mm guarantees a calculated airflow of 10,000mm² per linear metre, ensuring compliance effortlessly.

For High level ventilation The RV10 range of ridge vents, can be easily adapted to create an abutment or barge vent, that meet minimum NCC requirements for high level ventilation

Concrete_Tile_Traditional_Pitched_Roof_above_15_degrees
Concrete Tile Traditional Pitched Roof ≥15°

The National Construction Code 2022 Vol 1: F8D5 / ABCB Housing Provisions Standard 10.8.3 for a Traditional Pitched Roof ≥15°-75° requirement mandates “7,000mm² per linear metre at the eaves and 5,000mm² at high level.

Our G1200N Over Fascia Vent 10mm guarantees a calculated airflow of 10,000mm² per linear metre, ensuring compliance effortlessly.

For High-level ventilation, the G630 Lap Vent is a quick and easy install that allows high-level ventilation in line with NCC requirements, that requires no change of application to wet fix ridge capping.

Cathedral Roof Pitch Any Degree
Colourbond Cathedral Pitched Roof ≥10°

The National Construction Code 2022 Vol 1: F8D5 / ABCB Housing Provisions Standard 10.8.3 for a Cathedral Pitched Roof ≥ 10° requirement mandates “7,000mm² per linear metre at the eaves and 5,000mm² at high level, plus an additional 18,000mm²/m at the eaves if the roof has a cathedral ceiling.

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 10,000mm² per linear metre.
  • VB20 Ventilation & Drainage Batten 20mm: Offers calculated airflow of 16,000mm² per linear metre.

Combining these products yields a total of 26,000mm² per linear metre, surpassing the NCC minimum requirement of 25,000mm²

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

Mono Pitch Cathedral, Any Degree Pitch
Colourbond Cathedral Mono-Pitched Roof ≥10°

The National Construction Code 2022 Vol 1: F8D5 / ABCB Housing Provisions Standard 10.8.3 for a Cathedral Mono-Pitched Roof ≥ 10° requirement mandates “7,000mm² per linear metre at the eaves and 5,000mm² at high level, plus an additional 18,000mm²/m at the eaves if the roof has a cathedral ceiling.

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 10,000mm² per linear metre.
  • VB20 Ventilation & Drainage Batten 20mm: Offers calculated airflow of 16,000mm² per linear metre.

Combining these products yields a total of 26,000mm² per linear metre, surpassing the NCC minimum requirement of 25,000mm²

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