Passive House Airtightness: Achieving ACH50 ≤ 0.6
How to achieve the Passive House airtightness standard in Australian residential projects. Detailing strategies, common failure points, and testing protocols.
The Passive House Standard
Passive House (Passivhaus) requires an airtightness result of ≤ 0.6 Air Changes per Hour at 50 Pa (ACH50). This is approximately 17 times more stringent than NCC 2022.
Achieving 0.6 ACH
Success requires continuous air barrier detailing from design stage, careful selection of junction details, and a dedicated quality assurance process during construction. Early engagement with an airtightness consultant is essential.
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