Draft — Verify Against ABCB Source Before Use

NCC 2025 Volume Two 10.8.4 — Skillion & Cathedral Roof Ventilation Calculator

Calculates roof space ventilation where insulation runs parallel to the roof plane — Climate Zones 6, 7 & 8 only

1

Is the roof under 10 m² in area?

Select From Products Recommended For This Job

Based on your answers above, these are the product types and indicative quantities suited to this job.
Complete the questions above to see product recommendations.
This tool provides a guide only based on NCC 2025 Volume Two, Part 10.8.4. It does not replace advice from a licensed building practitioner, designer or certifier. Always confirm requirements against the version of the NCC and any State/Territory variations applicable to your project.