Sydney Build Panel: How Builders Can Cut Carbon: Timber, Heat Pumps & Low-Carbon Concrete

Lightweight Cladding and the Shift Away from Brick

Jason O’Hagan from Weathertex joins Dean to break down one of the more widely used alternative cladding products in Australia. This conversation looks at how Weathertex is made, where it fits in the shift toward lightweight construction, and why more builders are starting to question the materials they use for performance, and also the health and environmental impact. There’s also a broader discussion around prefabrication, carbon, and what actually changes in the industry when materials, methods, and expectations all start moving at once. In this episode: * What Weathertex is made from and how it’s manufactured * Why it’s considered a low-tox, low-carbon cladding option * The shift from masonry to lightweight construction * What builders are starting to care about (and why) * Third-party certifications and how they cut through greenwashing * Prefabrication and where cladding fits in that future * Internal vs external applications and real-world durability * The role of timber and biogenic carbon in construction Links and Resources: * Weathertex: weathertex.com.au [https://weathertex.com.au] * Weathertex video library: weathertex.com.au/resources/videos/ [https://weathertex.com.au/resources/videos/] * Global GreenTag: globalgreentag.com [https://www.globalgreentag.com] * Forest & Wood Products Australia: fwpa.com.au [https://www.fwpa.com.au] * PrefabAUS: prefabaus.org.au [https://www.prefabaus.org.au] Hosted by Dean Ipaviz, builder & director at Verdecon, creating high-performance, low-impact homes across Australia. Follow Dean Ipaviz [https://www.instagram.com/deanipa/] and @_thebuiltenvironment [https://_thebuiltenvironment/] on Instagram and visit thebuiltenvironment.com.au [https://www.thebuiltenvironment.com.au/]

Sydney Build Panel: How Builders Can Cut Carbon: Timber, Heat Pumps & Low-Carbon Concrete

Recorded live at Sydney Build, Dean is joined by Sean Bull (Xlam), Zac Kerr (Stiebel Eltron) and Dylan Viviers (Holcim) to explore how construction can meaningfully reduce carbon emissions. The panel unpacks the difference between embodied carbon and operational carbon, and where builders, designers and suppliers can take practical action today. From mass timber and prefabrication to heat pumps, solar integration and low-carbon concrete, the discussion focuses on collaboration, education and systems thinking over single silver bullet style solutions. In this episode: 1. What mass timber and CLT are and how they store carbon 2. Prefabrication, speed of construction and housing supply 3. Fire performance and structural considerations with CLT 4. Heat pumps, electrification and reducing operational energy demand 5. Using solar and thermal storage to flatten peak energy loads 6. Why building fabric and insulation should come first 7. How low-carbon concrete reduces embodied emissions 8. Misconceptions around set time, cost and performance 9. Environmental Product Declarations and carbon transparency 10. Managing construction waste and closing material loops 11. The role of policy, standards and education in industry change Links and Resources: 1. Sydney Build 2026 (April 29-30): sydneybuildexpo.com [https://www.sydneybuildexpo.com/] 2. Holcim EcoPact Low Carbon Concrete: holcim.com.au/ecopact [https://www.holcim.com.au/ecopact] 3. Xlam - Cross Laminated Timber: xlam.co [https://xlam.co/] 4. Surfers for Climate: surfersforclimate.org.au/ [https://surfersforclimate.org.au/] 5. Stiebel Eltron Australia: stiebel-eltron.com.au [https://www.stiebel-eltron.com.au] 6. Green Building Council of Australia: gbca.au [https://www.gbca.au/] 7. GBCA Transform Event (Sydney March 17th 2026): gbca.au/courses-events/major-events/transform [https://www.gbca.au/courses-events/major-events/transform] Hosted by Dean Ipaviz, builder & director at Verdecon, creating high-performance, low-impact homes across Australia. Follow Dean Ipaviz [https://www.instagram.com/deanipa/] and @_thebuiltenvironment [https://_thebuiltenvironment/] on Instagram and visit thebuiltenvironment.com.au [https://www.thebuiltenvironment.com.au/]

Ventilation Explained: Heat Recovery Systems & Airtight Homes

This is Part 2 of Dean’s conversation with Tom Stephenson from Stiebel Eltron. If you haven’t listened to Part 1, start there first. In this episode the conversation moves beyond heat pumps to the broader systems that make high-performance homes work — ventilation, airtightness, building fabric and energy management. Tom walks through the design of his own all-electric home, explaining how geothermal heating, ventilation with heat recovery, thermal storage and solar generation work together to reduce energy demand while improving comfort. The discussion also explores the practical realities of high-performance construction, including humidity management, cooling strategies and the role of smart controls in optimising energy use. In this episode: 1. Designing a high-performance, all-electric home 2. Geothermal heating, cooling and thermal storage 3. Ventilation systems and indoor air quality 4. The difference between HRV and ERV systems 5. Why airtight homes require controlled ventilation 6. Managing humidity and condensation risks 7. The role of solar, batteries and energy management systems 8. How building fabric impacts energy demand 9. Common misconceptions about heat pumps 10. The future of heat pump technology and refrigerants Tom also reflects on what he learned from building his own home, and why comfort, health and long-term performance often matter more than simple return-on-investment calculations. Links and Resources: 1. Stiebel Eltron Australia: stiebel-eltron.com.au [https://www.stiebel-eltron.com.au] 2. Your Home guide to ventilation and airtightness: yourhome.gov.au/passive-design/ventilation-airtightness [https://www.yourhome.gov.au/passive-design/ventilation-airtightness] Hosted by Dean Ipaviz, builder & director at Verdecon, creating high-performance, low-impact homes across Australia. Follow Dean Ipaviz [https://www.instagram.com/deanipa/] and @_thebuiltenvironment [https://_thebuiltenvironment/] on Instagram and visit thebuiltenvironment.com.au [https://www.thebuiltenvironment.com.au/]

Heat Pumps Explained: Efficient Hot Water, Heating & the All-Electric Home (Part 1)

Dean sits down with Tom Stephenson from Stiebel Eltron to unpack heat pump technology and the role it plays in electrifying modern homes. Tom explains how heat pumps work, why they’re significantly more efficient than gas systems, and how pairing them with solar PV changes the way homes consume and store energy. They explore why improving building fabric should come before adding mechanical systems, and how architects, builders and developers are starting to rethink energy systems in residential construction. The conversation explores: 1. How heat pumps work 2. What Coefficient of Performance (COP) means 3. Why heat pumps can produce 3–4x more heat energy than the electricity they use 4. Air-to-air, air-to-water and ground-source heat pumps 5. Why Australia’s plumbing systems have traditionally relied on gas 6. The shift toward all-electric homes 7. Solar PV, thermal storage and hot water as a “thermal battery” 8. Why building fabric and insulation matter before mechanical systems 9. Tom’s own all-electric home and how it performs in practice Links and Resources: 1. Stiebel Eltron Australia: stiebel-eltron.com.au [https://www.stiebel-eltron.com.au] 2. Your Home - Guide to Environmentally Sustainable Homes : yourhome.gov.au [https://www.yourhome.gov.au/] Hosted by Dean Ipaviz, builder & director at Verdecon, creating high-performance, low-impact homes across Australia. Follow Dean Ipaviz [https://www.instagram.com/deanipa/] and @_thebuiltenvironment [https://_thebuiltenvironment/] on Instagram and visit thebuiltenvironment.com.au [https://www.thebuiltenvironment.com.au/]

Embodied Carbon & Timber: The Case for Plantation Forestry

Dean sits down with Daniel Gudsell from Abodo to unpack timber, forestry and embodied carbon, and how material choices shape the long term impact of what we build. Daniel shares the origin story of Abodo, from exporting timber into the Pacific Islands to developing thermally modified radiata pine as an alternative to old growth hardwoods. Daniel also breaks down how fast growing plantation timber can store carbon more rapidly than slow growing species, and why the discussion needs to move beyond single issue sustainability This episode is all about understanding forestry, carbon accounting, material performance and the trade offs involved in building at scale. The conversation explores: 1. Why native hardwoods became the benchmark for durability and aesthetics 2. The limits of old growth supply in a housing constrained world 3. Thermal modification and how it changes timber performance 4. Plantation forestry vs native forest harvesting 5. FSC certification and set aside biodiversity land 6. Carbon storage in timber and how it’s measured 7. Why embodied carbon is an immediate impact 8. The limits of “carbon negative” claims 9. Passive House, materials selection and lifecycle thinking 10. Why composite decking may not be the environmental solution many assume Links and Resources: 1. Abodo: abodo.com.au [https://www.abodo.com.au/] 2. Follow Abodo Wood on instagram: @abodowood [https://www.instagram.com/abodowood/] 3. Abodo's Environmental Product Declaration: abodo.co.nz/uploads/resource/Abodo-Wood-Environmental-Product-Declaration.pdf [abodo.co.nz/uploads/resource/Abodo-Wood-Environmental-Product-Declaration.pdf] 4. Watch Daniel's TedX Talk on The Future of Wood: tedxauckland.com/people/daniel-gudsell/ [https://tedxauckland.com/people/daniel-gudsell/] 5. FSC - Forest Stewardship Council: fsc.org/en [https://fsc.org/en] 6. PEFC (Programme for the Endorsement of Forest Certification): pefc.org 7. Green Building Council Australia: gbca.au [https://www.gbca.au/] Hosted by Dean Ipaviz, builder & director at Verdecon, creating high-performance, low-impact homes across Australia. Follow Dean Ipaviz [https://www.instagram.com/deanipa/] and @_thebuiltenvironment [https://_thebuiltenvironment/] on Instagram and visit thebuiltenvironment.com.au [https://www.thebuiltenvironment.com.au/]