“Sustainable design is not just lower energy bills. It is health, comfort, moisture safety, and long-term performance.”

We sat down with Marcus Strang, Technical Lead in Passivhaus at HIP V. HYPE, to explore what sustainable building design really means in practice. With a PhD from the University of Queensland and deep expertise in building science, Marcus shares how Passive House design is helping shape healthier, more energy efficient buildings in Australia.

We unpack how Passivhaus principles go far beyond energy efficiency. This conversation covers thermal comfort, indoor air quality, moisture safety, and why high-performance homes need to respond to Australia’s diverse climate zones. Marcus explains how sustainable architecture is not about applying one formula everywhere, but about designing buildings that perform properly in their specific environment.

A major focus of the episode is hygrothermal modelling and moisture movement in engineered timber buildings, including CLT construction. Marcus shares why condensation risk, mould prevention, and long-term durability are critical parts of sustainable construction, especially in hot and humid climates. If you care about building performance, timber construction, and low-energy design, this part of the conversation is especially valuable.

We also talk about the bigger picture for the construction industry. How technical expertise, early design decisions, and better collaboration can help drive net zero carbon outcomes and more resilient buildings. If you are interested in Passive House Australia, sustainable design, building science, energy-efficient homes, and the future of high-performance construction, this episode is packed with practical insight.

👇 CHAPTER MARKERS 👇

00:00 Intro

01:58 Favourite Passive House Build

03:19 Meet Marcus Strang

04:05 What Is High Performance

07:44 Passive House In Humid Environments

12:41 ERVs And Dehumidification

14:08 Why Schools Need It

20:30 Commercial Modelling And Roles

22:52 Conflicts And Certification

23:37 Avoiding Certification Failures

25:29 Common Airtightness Mistakes

27:07 Moisture Risk in Cavities

27:29 Ventilated Brick Drainage

28:22 Photo Checklist Workflow

29:52 First Home Retrofit Plan

33:12 Low Cost Efficiency Upgrades

34:40 Step by Step Passive Retrofit

35:01 Windows and Air Quality

37:41 External Insulation Debate

42:06 Airtightness Without Intello

46:20 Apprentice Mindful Moment

48:44 Embodied Energy Tooling

50:57 EasyPH Controversy

52:14 Wrap Up and Thanks

LINKS:

Connect with Marcus:

https://hipvhype.com/our-approach/our-people?t=marcus-strang

Our Sponsors:

Pro Clima - https://mindful-builder.captivate.fm/proclima

MEGT - https://mindful-builder.captivate.fm/megt

Connect with us on Instagram: @themindfulbuilderpod

Connect with Hamish:

Instagram: @sanctumhomes

Website: www.yoursanctum.com.au/

Connect with Matt:

Instagram: @carlandconstructions

Website: www.carlandconstructions.com/

Mentioned in this episode:

Proclima Sponsor