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A group from across the building sector is concerned over airtight new builds and the potential moisture risk.
The Ventilation Collab includes builders, ventilation suppliers, mechanical consultants, academics and others from 23 organisations across the sector.
They say new builds are more airtight and better insulated than ever, but not well ventilated, which leads to moisture being trapped inside a home with nowhere to go.
The group has just released a discussion document calling for changes to the Building Code to ensure better house air quality.
Members of the group have raised the issue with Building Minister Chris Penk, who has told them improved ventilation is a key priority for him.
Kathryn speaks with Dan Richardson co-owner of Christchurch-based construction firm KR Construction, and Green Building Council residential business development manager Matthew Cutler-Welsh.