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 also shares his perspective on what it will take to make high-performance housing more scalable, more mainstream and more cost-competitive.

Special Guest: Johann Betz.

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 techniques.

Special Guest: Everett Norris.

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 also explores the role of mechanical ventilation in improving occupant health and comfort, the advantages of external retrofitting methods, and why practical, high-performance solutions are becoming increasingly important in New Zealand. Supported by the New Zealand Green Building Council and EECA, his book aims to provide designers, architects, and builders with a clear pathway toward achieving the best possible retrofit projects.

Special Guest: Jason Quinn.

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.