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NCC 2025 roof ventilation changes for condensation management
Roof ventilation rules are changing under NCC 2025, especially for homes in cooler climate zones where condensation risk is higher. The updated requirements affect how roof spaces are detailed, how ventilation areas are calculated, and where vents need to be placed - all of which can change standard roof designs and site detailing.
This detailed resource explains where the new ventilation rules apply, the difference between pitched roofs and raked or cathedral ceilings, and how the new calculation methods can slightly increase vent areas for some steeper roofs. It also outlines which roof types are exempt and what kinds of vents can be used to meet the requirements.
If you’re reviewing plans, setting up subcontractor scopes, or checking compliance on site, these changes are worth understanding now. Get clear, practical guidance to help you meet NCC 2025 requirements and reduce condensation risks before problems show up down the track.
Access this resource now
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Who is it for?
Building Professionals
Residential building industry professionals in Australia.
What does it include?
- NCC 2025 roof ventilation for condensation management
- Where the roof ventilation requirements apply
- Pitched roof with flat ceiling
- How these changes affect ventilation area
- Exemptions
- Raked or cathedral ceiling parallel to the roof plane
- Types of ventilation openings that can be used
- Suitability of materials
- Verification methods
- When the changes take effect