NCC 2022 · Volume Two

NCC 2022 Volume Two 10.8.3 - Calculator

Calculates roof ventilation requirements at high level and at eave (applicable to builds in climate zone 6, 7 & 8)

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Roof Space Ventilation

Enter the roof dimensions below to calculate the required open areas for compliant installations in applicable zones.

Longest horizontal dimension of the roof.
▶ Click to see 10.8.3 applicable climate zones Map of Australia highlighting Climate Zones 6, 7 and 8

Under NCC 2022 Condensation Management provisions, roof space ventilation is a mandatory requirement for buildings located in Climate Zones 6, 7 and 8 only. If your project falls within any other climate zone, roof space ventilation is not required under these regulations. To confirm your climate zone, check which climate zone you're in here.

See Calculation Table ▾
Roof Pitch Eaves Open Area High Level Open Area
Under 10°25,000 mm²/m (two opposing ends only)Not required
10° – 15°25,000 mm²/m5,000 mm²/m
15° – 75°, Non-Cathedral Ceiling7,000 mm²/m5,000 mm²/m
15° – 75°, Cathedral Ceiling25,000 mm²/m (7,000 + 18,000)5,000 mm²/m

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Based on your answers above, these are the product types and indicative quantities suited to this job.
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This tool provides a guide only based on NCC 2022 Volume Two, Part 10.8.3. 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.
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