VENT New Zealand Skillion Roof Design

Colourbond Cathedral Pitched Roof ≥10° Achieving BEYOND COMPLIANCE of the National Construction Code 2022 Vol 1: F8D5 / ABCB Housing Provisions Standard 10.8.3 ensures comprehensive mitigation of the risks associated with internal moisture in the roof cavity. BEYOND COMPLIANCE solutions go above and beyond the requirements of the NCC 2022, addressing critical areas such as preventing dew point transference, enabling Class 4 vapour permeable membranes to operate effectively, and ensuring unimpeded airflow past insulation. These measures are essential for maintaining optimal conditions within the roof space and minimizing the potential for moisture-related issues 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. ” 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/lm, ensuring compliance effortlessly. The VB20 Ventilation & Drainage Batten ensures unimpeded airflow through the roof cavity, above the roof battens. The VB10 Ventilation & Drainage Batten 10mm creates a separation between Colourbond roof and the Class 4 vapor permeable membrane 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 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 Either solution provides peace of mind for your project’s compliance needs. This installation video from our New Zealand entity shows how to achieve a ventilation system beyond NCC compliances for a robust moisture management ventilation system.