2019 October 1 Build: How Airtight Do Houses Need To Be

This article doesn’t really come to a conclusion other than the old rule of thumb of divide the blower door ACHn50 by 20 to determine the average infiltration is not accurate. I know how hard it is to estimate the site wind speed from weather station data and then the pressure across the envelope and of course the ACHn50 number …

2019 September 30 Passive Houses on Energy Efficiency

80-90% heating energy reduction (well for those that could afford to heat their homes) saves energy, CO2 and costs less over the lifespan of the building than building to the legally required minimum (i.e. code). Passive House Pools (Passivhaus) are being built in the UK and were measured to save 70% of the heating energy costs (electricity) in the first …

2019 September 27 AU Codes to Zero Carbon

Built to Perform: An Industry Led Pathway to a Zero Carbon Ready Building Code 3 July 2018 Improved energy performance of buildings presents a win-win-win opportunity, reducing stress on the electricity network, offering bill savings, supporting a least-cost pathway to a zero-carbon built environment, and improving health and resilience outcomes for households and businesses https://www.asbec.asn.au/research-items/built-perform/ Trajectory for Low Energy Buildings …

2019 September 20 ATTMA: Registered Air Tightness Testers - New Zealand

2019 September 20 ATTMA: Registered Air Tightness Testers – New Zealand

List of all the current air leakage testers in New Zealand accredited with ATTMA. Air leakage testing very tight buildings (as they all should be build tight and ventilate right is a thing after all) can be tricky and the right training makes it much easier. We recommend for your Passive House blower door test: Air leakage testing is done …

Oppose NASH as AS for E2 as it doesn’t cover external insulation

And putting batts between light steel framing is not a good option as discussed below. https://www.mbie.govt.nz/have-your-say/building-code-update-consultation-november-2019 The Oak Ridge National Laboratory has found that thermal bridging in a wood-framed wall lowers the effectiveness of cavity insulation by 10%, but performance drops a whopping 55% in a wall framed with steel. https://www.buildingscience.com/documents/insights/bsi-005-a-bridge-too-far “But from a hygrothermal standpoint, I can only add …

19 August 2019 BMJ Journals: Damp mouldy housing and early childhood hospital admissions for acute respiratory infection: a case control study

Damp mouldy housing and early childhood hospital admissions for acute respiratory infection: a case control study Bottom line for the Wellington Region alone 1710 hospitalizations per year for children under 2 years old would be prevented if all housing were free from damp and mould!! “This paper presents the largest ever case–control study of the association between housing quality and hospital …

19 August 2019 SunLive: Crank up the heat on someone’s winter

Yes sometimes even sick folks living in cold homes don’t realize how it impacts their health. “Two weeks ago, the temperature dropped to zero or one degrees inland where a woman with cancer was living. Her nights were a struggle, her breathing was laboured and each day she woke up exhausted. Healthy Homes chatted with her about the importance of …

13 August 2019 Voxy: Energy company looks at health effects of cold homes

“The WHO report found that cold indoor temperatures have been associated with increased blood pressure, asthma symptoms and poor mental health. Cold homes contribute to increases in deaths and disease. It is estimated that in New Zealand 1600 additional people die each winter, with respiratory and cardiovascular disease highly prevalent in these alarming statistics. Elderly people, children and those with …