NCC 2022 · Volume Two

Alpine Ventilation: NCC Condensation Management Calculator

Check exhaust ventilation and roof space ventilation requirements under NCC 2022 Part 10.8, and get a recommended product list for your job.

1

Exhaust Systems

NCC 2022 — 10.8.2
Determines the minimum mechanical exhaust airflow rate required.
2

Roof Space Ventilation

NCC 2022 — 10.8.3 / Table 10.8.3
Roof space ventilation provisions apply to Climate Zones 6, 7 and 8 only.
Measured horizontally — the longest plan dimension of the roof.
Only relevant for pitches of 15° or more — cathedral ceilings require a higher eaves open area.
Roof Pitch Eaves Open Area High Level Open Area
Less than 10°25,000 mm²/m (two opposing ends only)Not required
10° to less than 15°25,000 mm²/m5,000 mm²/m
15° to less than 75° (Standard ceiling)7,000 mm²/m5,000 mm²/m
15° to less than 75° (Cathedral / Raked ceiling)25,000 mm²/m (7,000 + 18,000)5,000 mm²/m

Recommended Products For This Job

Based on your answers above, these are the product types and indicative quantities suited to this job.
Complete the sections above to see your recommendations.
This tool provides a guide only based on NCC 2022 Volume Two, Part 10.8. 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.