Yesterday, we put one of Strine's homes to the test with our blower door and thermal camera... and the results were impressive.
Our testing of Canberra homes (new and old) has so far shown the average number of air changes per hour (ACH) at 50 Pascals to be around 20. Modern European homes, built using advanced sealing techniques, aim for 1.5 - 3.0 ACH at 50 Pa (ie. they are very air tight, energy efficient and comfortable) and require mechanical ventilation systems to maintain healthy indoor air quality.
The three bedroom Strine 'Milennium' home, completed in 2006, had just 6.2 ACH at 50 Pa. At normal pressures of ~ 1 - 4 Pa the house was having roughly 1 - 1.5 ACH. For healthy indoor air quality 0.5 - 1.0 ACH are recommended. So the house is very air tight by Australian standards and if efforts were made to tighten it even further the homeowners would need to consider installing a heat exchange, mechanical ventilation system (to ensure good air quality when all the windows, doors and solar chimneys were closed).
The temperature of the precast concrete walls was remarkably even. Comparison of the external and internal temperatures of a section of eastern wall at 11.30 am on a sunny, 25 degree day showed a 20 degree difference (40.8 & 20.6 degrees, respectively).