Blower Door Test — Willunga Shouse Conversion
Project overview
An ATTMA-compliant air leakage test on a home at Willunga, extensively renovated from a shed (a "shouse") into a striking home with sweeping views. Despite the owner's efforts fitting dampers to the bathroom and laundry exhaust fans, our Retrotec blower door traced the main leakage back to the sliding doors and those same fan penetrations — a common pattern in shed-to-house conversions where the original structure wasn't built to a residential airtightness standard.
3.556 ACH
Air changes @ 50 Pa
3.393 m³/(h·m²)
Air permeability @ 50 Pa
486.7 cm² · 0.049 m²
Equivalent leakage area
Outcome
Result: 3.556 ACH @ 50 Pa — equivalent to a 486.7 cm² (0.049 m²) hole in the building envelope, about a 25 cm round opening. Main leakage traced to the sliding doors and the bathroom/laundry exhaust fans, despite dampers already fitted.
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