Pro Clima Podcast

Jessica and Simon discuss how thoughtful design, natural materials, and high-performance technologies can create healthier, more energy-efficient homes. Jessica also discusses the challenges of retrofitting existing buildings, the importance of moisture management and ventilation, and why New Zealand needs stronger building standards to improve building performance.

Special Guest: Jessica Winter.

Simon and Johann discuss the gap between design and manufacture—and how bridging this gap unlocks greater productivity in construction. Johann explores why simply investing in bigger factories or new technology isn't the answer, and why modern high-performance buildings need to be designed with manufacture and assembly in mind from the outset.

They discuss the potential of panelised prefabrication and Design for Manufacture and Assembly (DfMA) to improve productivity, quality and on-site efficiency, as well as the role of [OSM3604®](www.osm3604.nz) in supporting a more consistent approach to high-performance timber construction in New Zealand. Johann als...

Drawing on his own experience building and living in a SIPS Passive House, Toby highlights how construction decisions can improve comfort, energy efficiency and indoor health. He also discusses why builders should look beyond minimum building code requirements when delivering better-performing homes. Toby emphasises the value of collaboration between builders, architects and clients in achieving successful high-performance construction outcomes.

Special Guest: Toby Tilsley.

In this episode, Jeff explains why even small changes to inspection processes can have significant impacts and discusses the factors driving higher inspection failure rates during periods of rapid construction growth.

He also explores the role of technology in improving quality assurance, including the benefits of remote inspections and digital tools such as the BRANZ Artisan app. The conversation touches on both the opportunities and challenges of modular construction in New Zealand, before highlighting the importance of ongoing education, compliance, and raising standards across the building industry.

Special Guest: Jeff Fahrensohn.

Together with Elizabeth, Everett designed and built a straw bale home that combines natural materials with high-performance building principles, including triple-glazed windows and mechanical heat recovery ventilation. Everett discusses the lessons learned throughout the build, from managing costs and navigating design decisions to balancing sustainability, comfort, and performance. He explains why low-toxicity materials and low embodied energy were key priorities, and how these choices have contributed to a remarkably comfortable home that remains warm, quiet, and healthy year-round. Despite winter conditions, the house has yet to require any active heating, demonstrating the potential of thoughtful design and natural building...

Jason Quinn, founder of Sustainable Engineering Limited, shares insights from his upcoming book on deep energy retrofits in New Zealand and explains why improving existing buildings is critical for creating healthier, more energy-efficient homes.

In the episode, Jason discusses the importance of taking “performance snapshots” to properly assess a building before beginning retrofit work, along with the benefits of prioritising the building fabric before relying on mechanical systems. He highlights a standout retrofit project that reduced energy consumption from 370 kWh/m²/year to just 58 kWh/m²/year, demonstrating what’s possible with the right approach.

Jason al...

Chris Laumer-Giddens shares his journey into architecture and why airtight building envelopes are critical for preventing moisture and mould. Drawing on a Passive House project that achieved zero air leakage, he highlights what’s possible with the right approach.
Chris also advocates for simpler, more durable design, challenges over-complicated solutions like spray foam, and explains why ERVs can outperform HRVs when it comes to moisture control — all while keeping long-term comfort and building performance front of mind.

Special Guest: Chris Laumer-Giddens.

Kim Aitken shares her journey from Ireland to Scotland and into a diverse career spanning time with the British Army, Product Design Engineering, and Structural Engineering in Canada. She introduces Truss House™ - an innovative system using roof trusses as the primary structure to deliver faster, more efficient builds. Despite early hurdles, including a Dragon’s Den appearance and COVID-19 disruptions, the concept has gained strong traction in New Zealand through partnerships with Pryda and Bunnings Trade, with current plans on the drawing board for everything from modular to multi-storey housing.

Special Guest: Kim Aitkin.

In this episode of the Pro Clima Podcast, Simon Cator talks with Auckland-based (but Toronto born and raised) building enclosure engineer Peter Raimondo about adapting building science principles from Canada to New Zealand. Raimondo discusses challenges in local construction practices, the importance of airtightness and ventilation, and how controlled airflow prevents condensation and energy loss. He also shares insights from blower door testing, international best practice, and his role as MC for the upcoming Building Science Summit, focused on industry collaboration and knowledge sharing.

Special Guest: Peter Raimondo.

Simon Wandsborough joins the pro clima Podcast to discuss his journey from outdoor instructor to eco-conscious builder and the thinking behind his business, Third Little Pig. He shares how growing up in New Zealand and completing an adult apprenticeship shaped his focus on building better, more comfortable, and energy-efficient homes.
The conversation explores high-performance building principles such as passive solar design, insulation, airtightness, and quality windows, alongside the need for better education and early collaboration between clients, architects, and builders. Simon also reflects on the limitations of New Zealand’s building code, common misconceptions around cost and airtightness, an...

Special Guest: Freidrich Strey.

In this episode, industrial designer Andre Heller shares how his diverse background, from boat building to underground station construction, has shaped his fresh approach to prefabricated housing. Through his company, Flexi House, Andre is redefining offsite manufacturing by prioritising speed, efficiency, and consistent quality. Their lightweight timber frame system, complete with continuous insulation and air barriers, delivers a minimum 46% boost in thermal performance over standard New Zealand homes with the potential to reach Passive House levels, making high-performance building more attainable. Andre also dives into his vision for making offsite construction as simple and accessible as ordering from an...

In this episode, Sharon Robinson, architectural designer, certified Passive House and Homestar designer - shares how her company Smart Living Spaces, is redefining housing accessibility through its innovative Small, Smart Spaces concept. By combining the benefits of group housing, bespoke design, and offsite construction, Sharon is helping make high-performance homes achievable for more New Zealanders. She also explores how Homestar-rated homes can impact energy bills by up to 50% improvement in health and comfort with the same or lower power bills people are used to paying and unlock better mortgage rates, while emphasizing the power of collaboration between designers, builders...

Dr. Antony Pelosi, a researcher and educator at Victoria University, discusses his journey from building science to architecture, including his time at the University of California, Berkeley. He shares his PhD on spatial comprehension in BIM models and the early use of AI for pathfinding. Pelosi is currently designing and building a $300,000 passive house, emphasising cost-effective materials and energy efficiency. He explores AI's role in architecture, highlighting its use in text generation, image rendering, and 3D modelling. Pelosi also discusses the potential of AI in construction, sustainability analysis, and the need for reimagining design and delivery processes to improve...

In this episode, Casper Valintin shares his journey from a childhood split between Brunei and Scotland to careers in horticulture and IT — and ultimately, to a deep passion for high-performance building. After constructing his first ICF block home in Hamilton, New Zealand, Casper became a strong advocate for Passive House principles. He talks through the features of his own home, including 400mm of roof insulation, continuous slab insulation, and a Zehnder ground-source ventilation system. With sensors tracking performance, he’s fine-tuned the house to maintain a consistent 20°C indoors — proving how smart design, insulation, and ventilation can deliver lasting comfort...

In this episode, building scientist Dr. Allison Bailes shares his journey from physics academia to the world of building science. He discusses the importance of airtightness in homes, explaining how it directly impacts indoor air quality, comfort, energy efficiency, and moisture control. Bailes challenges the myth that houses need to “breathe,” advocating instead for air-tight construction combined with well-designed ventilation systems.

Special Guest: Allison Bailles .

In this episode of the pro clima Podcast, Simon Cator and Jon Davies sit down with Arena Williams, MP for Manurewa, for a conversation on housing, policy, and the future of building in Aotearoa.
They discuss the overseas building products register, unconsented granny flats, and Arena’s vision for her time in parliament. She also highlights the urgent need to modernise New Zealand’s building code—calling out issues like moisture management and fire safety—and the vital role cross-party collaboration and industry input must play in shaping future reforms.

Special Guest: Arena Williams.

In this episode of the pro clima Podcast, architect Sian Taylor shares her journey from growing up in Wales to designing and living in a Passive House in Queenstown. She reflects on the contrasts between UK and New Zealand building standards, highlighting the superior comfort and energy efficiency of Passive House design.
Sian also critiques the current New Zealand building code, calling out its shortcomings and advocating for stronger regulations, especially the need for mandatory energy modelling to address issues like overheating.

Special Guest: Sian Taylor.

In this episode of the pro clima Podcast, Simon Cator sits down with Mark Anderson of MA Building, a Wanaka-based builder, as he shares how an apprenticeship alongside his father led to his journey into building high-performance homes, focusing on health and comfort. He reflects on his commitment to energy efficiency and how it drives his focus on Passive house standards and smarter building methods.
He discusses his role in community initiatives like the Better Building Working Group, his plans for a low-energy home, and the small design decisions that make a big impact on comfort, cost, and...

In this episode of the pro clima Podcast, host Simon sits down with Jason Quinn, the Director of Sustainable Engineering, as they discuss overheating in homes and how to design to prevent it from happening.
Jason explains the balance between reducing heat gain in the summer and losing some solar gain in the winter, and the importance of good glass specification.
He also goes over the importance of understanding building performance through modelling and making design changes early in the process to avoid any problems in the future.

Special Guest: Jason Quinn.

In this episode of the pro clima Podcast, host Simon Cator sits down with Bronwyn Barry, Principal at PassiveHouseBB, for an insightful conversation about Passive House design.
Bronwyn talks about a pre-fabricated panel solution that is really cost-effective while still having a really high insulation value. She also shares her perspective on an often-overlooked advantage of Passive House design, superior acoustic comfort.

Special Guest: Bronwyn Barry.

Join Simon Cator as he sits down with Denise Martin, Director at BEO, for an insightful discussion on building science and insulation practices in New Zealand.
Denise explores the unique challenges of insulating concrete structures and explains the advantages of exterior insulation. She also highlights how proper insulation and airtightness can lead to significant energy savings, ultimately reducing your power bill. Throughout the conversation, Denise shares expert insights on the relationship between airtightness and energy performance, as well as the crucial role of ventilation and moisture management in creating a healthier home environment. Tune in for valuable knowledge...

In this episode of the pro clima Podcast, host Simon Cator sits down with Graham Finch, Principal Science Specialist at RDH Building Science, for an in-depth discussion on rain screen walls—their function, importance, and the key differences between open and closed rain screens. Graham shares his expert insights on how different cladding systems impact not only the performance of a building but also its longevity, highlighting critical considerations for architects, builders, and designers. Whether you're a construction professional or simply interested in the science behind moisture management in buildings, this episode is packed with valuable knowledge you won’t wa...

Join Simon Cator in conversation with Dan Saunders as they explore New Zealand’s H1 building code changes and discuss how we can promote higher standards. This engaging discussion dives into the challenges and opportunities of creating homes that are not only durable but also better suited for Kiwi lifestyles.
Dan shares expert advice on selecting the right building materials, debunks common myths about constructing high-performance homes, and offers practical steps for achieving better results. Whether you’re a homeowner, builder, or simply interested in the future of housing in New Zealand, this is a conversation you won’t want...

Join Simon Cator as he interviews Architect Bob Burnett to explore the transformative work behind the Christchurch Earthquake rebuild, the origins of the Superhome Movement, and how to select the perfect architect for your dream home.

In this insightful episode, Bob shares the guiding principles of the Superhome Movement, including airtight designs, low-carbon materials, and the importance of responsibly sourced resources. He reflects on how witnessing the Christchurch rebuild and the prevalence of substandard housing across New Zealand inspired his mission to design healthier, more sustainable homes.

Special Guest: Bob Burnett.

In this episode of the Pro Clima Podcast, host Simon Cator is joined by Nick Gaites from Reveal Building Consultants for an insightful discussion on one of New Zealand’s pressing housing challenges—overheating. Together, they explore how energy modelling, fixed shading, reduced glass areas, and improved insulation can transform building performance and elevate comfort levels.
Nick also shares valuable strategies for retrofitting existing homes to enhance their performance. From starting with energy modelling to assess current conditions, to implementing practical solutions, this conversation provides a roadmap for creating healthier, more energy-efficient housing in New Zealand.

Spec...

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.
Throughout the podcast, Matthew shares insights about the assumptions surrounding new builds meeting healthy living standards and explains the differences between the three methods for calculating energy or insulation values for homes: the modeling method, the schedule method, and the calculation method. He also examines the...

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 mea...

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...

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...

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...

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 ad...

_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.

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 en...

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...

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.

"I hope we'll see a change in the outcome for renovation work which has energy modelling and predicted energy demand for that building - for any building - in play during the design process; and then just put some minimums around that."

In this podcast, Jon discusses his transition from teaching to the building industry where tangible results were more easily visible. He talks about a home renovation project, emphasizing the importance of creating a comfortable living environment by addressing common issues like drafts and poor insulation. Jon describes his Masters thesis - the use of Parka...

"Ask yourself, what is your house going to be worth in 2030. A certified Passive House is on the operating levels, energy-wise, of where we're going in 2030. So do you consider your house an investment? I think we put more consideration into the performance of the cars that we buy than we put into the houses that we are creating, and our homes are the largest financial investment that we make in our lives."

In this podcast, Sharon advises homeowners to research the Passive House principles via the Passive House Institute of New Zealand (PHINZ) website, focusing on...

Dr. Straube explains the importance of the critical elements of the building structure, balancing insulation values with good airtightness levels and high-performance windows: "It's a rule of physics that you need to be able to match those three components of typical houses to get the value out of each one of those components."

In this episode of the pro clima Podcast, John Straube emphasizes the importance of balancing components such as insulation, airtightness, windows and ventilation in building design to achieve optimal energy efficiency and indoor air quality. He explains that airtightness is often misunderstood but is...

"We moved into a brand new house in Taupo, it was double-glazed and looked good, but it was blimmin' cold. I couldn’t understand why people would put up with it. Because of this environment, we decided we wanted to live in a more comfortable house."

In this episode of the pro clima Podcast, Simon Cator interviews Kim Feldborg, a builder from Denmark who moved to New Zealand in 2007. Shocked by the cold temperatures in his rental home, Kim decided to design and build a Passive House, which he and his family have been living in for ov...