2020 January 22 Yes – it’s a Passive House Plus Office Building

Crazy looking building: but under the iridescent facade is a standard form office building. Well, standard aside from the funky double concrete staircase. The architect’s website has some great photos. but the really interesting point is the performance … this is a Certified Passive House Plus. It’s listed as the largest certified project in France as at the time of …

2020 January 09 Passive House + Sustainable Building: Xtratherm Launch New Part L NZEB Briefing Note

HEADING Ireland releases new nearly-zero energy building regulations Ireland has released its nearly-zero energy buildings regulations (to comply with EU requirements) and insulation supplier Xtratherm has published a guide for builders/designers. I’ve pulled together a table of the minimum performance values and calculated the R-values to help folks in NZ compare. These are average values and include thermal bridging from …

About time: Damn right, mechanical ventilation is appropriate in all new buildings

Why am I sounding overjoyed at this simple text from BRANZ? The backstory goes a long way back.   In its <December 2019 Guideline https://www.branz.co.nz/guideline>, the front story is about smart vapour retarders (SVR) and how they lower the risk of mould in New Zealand wall assemblies. (There’s a story about that too, but that’s for another time.) The big …

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 …