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From 1 July 2026, updated National Construction Code (NCC2025) provisions bring in stricter condensation management requirements for wall and roof cavities under part 10.8 of the Housing Provision - Condensation Management. This is part of a broader push for healthier more durable homes. This page answers the questions builders and designers ask most about drained and ventilated cavities, vapour-permeable membranes and roof space ventilation under the new provisions.
