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Condensation management 2025 - does my external wall need a cavity?
Wall cavities are now a bigger part of how condensation must be managed under NCC 2025, particularly in colder climate zones. For many common wall systems, a drained and ventilated cavity is no longer optional - it’s part of the Deemed-to-Satisfy pathway for meeting the new condensation rules.
This illustrated resource explains where cavities are required, how climate zones affect your wall design options, and how membranes and cavities work together to manage moisture. It also shows where the cavity must sit in the wall build-up and what minimum depths, drainage and ventilation openings are needed to stay compliant.
If you’re reviewing details, choosing wall systems or checking site installations, these changes can affect both compliance and construction sequencing. Get clear, practical guidance so you can design and build external walls that meet NCC 2025 requirements and reduce condensation risk on site.
Access this resource now
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Who is it for?
Building Professionals
Residential building industry professionals in Australia.
What does it include?
- Where is a wall cavity required for condensation management?
- Location of cavities
- Drainage and ventilation of cavities
- Exemptions (wall types not requiring cavities)
- Verification methods.