Measuring Airtightness in New Zealand Passive Houses

A blower door test to measure the airtightness in a New Zealand Passive House building needs to be performed in accordance with AS/NZS ISO 9972:2015. The only exception to this is the calculation of the internal reference volume outlined in section 6.1.1 of the standard. The air change rate (ach) at a pressure difference of Read more about Measuring Airtightness in New Zealand Passive Houses[…]

How to account for thermal bridges

R or U-values do not tell the whole story about transmission heat loss through the building envelope. In fact, the better you insulate your building, the more you need to pay attention to rat-runs to get the full benefit of the thermal separation. The following instructions are a refresher for people who did thermal bridge Read more about How to account for thermal bridges[…]

All models are wrong – but some are useful

The right tools are needed to do a proper energy modelling job. For Certified Passive Houses, using the Passive House Planning Package (PHPP) is mandatory. It is the only energy modelling tool in the world that has successfully been tested against real-world results on a large number of projects (see here for some examples). Thousands of Certified Passive Houses deliver results very close to the modelling expectations. Other modelling tools are clearly not performing that well, or have never been tested. […]

Taramea Passive House

The Housing Trifecta. Can we have homes that are affordable, healthy and resilient?

This important article by PHINZ member Glenn Murdoch was published today on the Pure Advantage website. Affordability, Health and Comfort, Climate Change Resilience Our homes are important to us. Be it owned or rented our home is where we live, love, laugh, play, share and rejoice. It’s where we raise our kids, have dinner with Read more about The Housing Trifecta. Can we have homes that are affordable, healthy and resilient?[…]

Comfort in an eHaus Passive House

Passive Houses – built for comfort and health

It is impossible to achieve an indoor environment that can be categorised as comfortable by international standards (e.g. ASHRAE 55 or ISO 7730) with an indoor air temperature of only 18°C.

Despite the myth, there is no indication that Kiwis are more tolerant to colder temperatures than people elsewhere in the world, which should not come as a surprise, as many of us were born overseas, or grew up in far away places. In fact, several NZ studies suggest that if Kiwis are capable, technically and financially, to heat their homes to the degree Americans and Europeans are accustomed to, they will (Fyfe, 2005; Howden-Chapman et al, 2009). […]