In this episode of the pro clima Podcast, Simon Cator sits down with Matthew Cutler-Welsh from Home Style Green at the Green Building Council. They discuss the role Home Style Green plays in educating and assisting New Zealanders in designing and building more sustainably, along with addressing carbon targets and reporting requirements.

Special Guest: Matthew Cutler-Welsh.

Join Simon Cator and Manfred Kehrer as they discuss Manfred's upbringing in Bavaria, his interest in building science and, how he ended up working at the Fraunhofer Institute.

They discuss the early development of WUFI® software and how he helped in the early stages of the development process, working alongside Hartwig Künzel. He touches on the differences between WUFI® modelling and the Glaser method, and how the Glaser method can often lead to overestimation of moisture issues.

“What people don't know is how many times we discovered measurement errors because we figured out that. I mean, at some point we've seen that the measurement and the simulation doesn't work out well.”

Special Guest: Manfred Kehrer.

Join Simon Cator as he sits down with Kara Rosemeier, director of the Passive House Academy in New Zealand, discussing Kara's early career in physiotherapy to then studying Architecture in Germany before moving to New Zealand in 2001.

Kara talks about her emphasis on building science and shares insights on ventilation in New Zealand homes, highlighting that air change rates don’t often correlate with Blower Door tests and that openable windows alone are insufficient for effective ventilation.

Throughout the podcast, she shares valuable insights into the contaminants in your home and the importance of having a continuous ventilation system when it comes to minimising the amount of contaminants in your house.

“So the main purpose of the system, obviously, is to keep you healthy, and you keep your house well ventilated. But as a side effect, you get huge energy savings, and you get huge gains in comfort.”

Special Guest: Kara Rosemeier.

In this episode of the pro clima Podcast, Simon sits down with Hartwig Künzel, who shares his journey with Fraunhofer—from accompanying his father at the test fields as a child, through his studies in chemical engineering, to his pivotal role today at the Institute.

Hartwig dives into the critical role of understanding vapour permeability in construction, highlighting the creation and impact of the WUFI® model. He explains both the significance and complexities of working with WUFI®, along with the challenges that can arise in its calculation. Reflecting on earlier methods of hygrothermal modelling, Hartwig discusses their limitations.

Now at the forefront of construction modelling, Hartwig leads efforts in developing and refining tools to measure risks like mould and rot, and is currently advancing in post-processing models to drive even greater accuracy in building science.

“Vapour permeability is probably the most important parameter when it comes to hygrothermal simulations. The good thing about that is that is mostly pretty well known.”

Special Guest: Hartwig Künzel.

In this episode of the pro clima Podcast, Barry shares with Simon his journey from studying engineering to transitioning into airtightness testing with ATTMA (Air Tightness Testing & Measurement Association) where he has worked for 10 years.

Simon and Barry discuss the process of Blower Door testing and emphasise the importance of airtightness testing for energy efficiency, citing that homes with improved airtightness can achieve up to 35% energy savings for heating alone.

Barry talks about the future of airtightness testing, and how he predicts there to be a shift in the way we test for airtightness, instead he predicted we would be using ‘actual energy usage’ metrics rather than predictive models for evaluating building performance, leading to higher energy efficiency standards.

Throughout the podcast, he shares valuable insights into the importance of airtightness in buildings and the effects on energy efficiency in your home. He encourages others to consider the growing global importance of energy efficiency and sustainable building practices.

“You can make even a 20% reduction in the amount of energy you use. That adds up over 10 years.”

Special Guest: Barry Cope.

In this episode of the pro clima Podcast, Simon and Vlada delve into Vlada’s career as a European-trained architect and Certified Passive House Designer. Vlada, now based in Auckland, is passionate about promoting Passive House design in New Zealand. Vlada has completed multiple certified Passive House projects, as well as many other high-performance building projects throughout NZ.

During the discussion, he shares some of the main challenges he faces, particularly misconceptions around the cost of Passive House design. He highlights the need to educate clients and consultants on the numerous benefits of Passive House design, while addressing common misconceptions, such as the belief that Passive Houses are prohibitively expensive or that windows can't be opened.

Simon and Vlada also touch on the future of Smart Home Technology integration with Passive House design. Vlada sees great potential in using smart controls—like external shutters and roll blinds—to manage solar gains and air temperature, improving both performance and comfort in Passive Houses.

Throughout the podcast, Vlada emphasizes the critical balance between theoretical knowledge and practical application in house design, stressing the importance of education and raising industry standards in construction.

“It's easy to explain why Passive House is champion, because we know that it's arguably the highest possible standard in energy efficiency.”

Special Guest: Vlada Acimovic.

_Now is the time to press play on my next property development! _

This podcast conversation between Simon Cator and Murray Alcock explores Murray’s career in property development and construction, his experience with building techniques, and his current efforts to improve housing design and energy efficiency in New Zealand.

Murray is committed to building homes that do not introduce long-term problems to the buyers, emphasizing the importance of keeping the right balance between individual elements such as for example mechanical ventilation & airtightness, choice of materials, maintaining cost efficiency while meeting higher environmental and livability standards.

He aims to improve construction efficiency by standardizing designs, reducing custom elements, and using offsite manufacturing techniques. The focus is on scalable terrace housing projects designed for long-term investors, with an emphasis on reducing waste and streamlining the construction process.

"If we continue just building to code, we're actually building problems into houses for people for the future." , says Murray when talking about what triggered his interest and what is his main driver when it comes to sustainable building.

Special Guest: Murray Alcock.

In this episode of the pro clima Podcast, Steve shares his journey from living in a renovated 1860s villa in Ponsonby, Auckland, to building an off-grid Passive House in Coromandel. He recounts how the villa’s renovation revealed issues with heat retention, leading to high energy costs and discomfort. This experience, along with a desire to live more sustainably, inspired his family's move to Coromandel, where they began with minimal infrastructure, even living in a tent while constructing their new home.

Steve discusses with Simon the process of building the new passive home, emphasizing the importance of energy efficiency through careful design and the challenges of using unconventional building materials. He explains the significance of proper ventilation, airtightness, and thermal performance for a comfortable home environment and provides insights on energy modelling, cost considerations, and meeting Passive House standards. Steve also addresses the broader context of New Zealand’s housing, stressing the need for improved thermal performance and energy efficiency.

Throughout the podcast, he shares valuable lessons from his hands-on experiences and encourages others to consider sustainable building practices, whether in new constructions, smaller dwellings, or retrofitting projects.

Special Guest: Steven Hughes.

In this episode of the pro clima Podcast, Joe shares his personal journey in architecture, from his childhood in a 1890s farmhouse to pursuing a career in architecture and later moving to New Zealand for a better work-life balance. Facing unhealthy rental conditions in New Zealand, Joe and his wife decided to build their own house to ensure a healthier living environment for their family. They prioritized continuous insulation, high-quality windows, and proper ventilation while balancing budget constraints. Despite challenges, including high construction costs and bank valuation issues, Joe creatively managed to design and construct a functional, affordable, and healthy home by making various compromises.

Joe and Simon discuss building code compliance and energy modelling in New Zealand. Joe highlights the limitations of the building code in ensuring thermal performance and comfort, and argues that energy modelling is the only reliable way to assess a building's performance, as it considers all building elements and the specific site and climate. Energy modelling helps ensure building performance outcomes are met, saving money and reducing carbon. Tune in for more.

Special Guest: Joe Lyth.

Links:

• Homestar Design Guide — A practical design guide to lower carbon healthier homes
• Lower Saddle Passive House — The journey to creating a Passive House in New Zealand on a budget

In this episode of the pro clima Podcast, Simon Cator and Jon Davies speak to Building and Construction Minister Chris Penk.

The discussion revolves around the Minister’s desire to build “Simply, Cheaply and Quickly” - the recent controversial media furore regarding the government's signal to roll back the H1 insulation standards and other building and construction-related issues.

The discussion also touches on easing the regulations for granny flats, developing well-qualified construction workers and revising regulations to maintain building standards.

Special Guests: Chris Penk and Jon Davies.