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Understanding the control layer's role in condensation management
NCC 2025 introduces new rules for control layers as part of updated condensation management requirements. These affect common materials like sarking and pliable membranes, with minimum vapour permeance levels now linked to climate zones and where the layer sits in the wall or roof build.
This resource explains what counts as a control layer, when cavities are required, and how the rules change for walls, pitched roofs and cathedral ceilings. It also helps you understand which membrane classes are needed in different climates so you can avoid trapping moisture inside the building envelope.
If you’re selecting products or checking installs, these details matter. Get practical guidance so you can 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 professional in Australia.
What does it include?
- What is a 'control layer'?
- Control layers - vapour permeance requirements
- Walls
- Control layers within a roof
- When do the changes take effect?
- Need help understanding these changes?