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The Built Environment: Daily Summaries Delivered
by Dean Ipaviz
From homes to high rises, the Built Environment shapes everything around us. This podcast is about asking better questions about construction, design, sustainability, and how we live. Whether you're a builder, architect, homeowner, or just curious, this is a space for open, honest conversations about the future we're creating together.
Latest Episodes
The most recent episodes — sign up to get AI-powered summaries of each one.
- Mar 29, 202658 min
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 manufacturedWhy it’s considered a low-tox, low-carbon cladding optionThe shift from masonry to lightweight constructionWhat builders are starting to care about (and why)Third-party certifications and how they cut through greenwashingPrefabrication and where cladding fits in that futureInternal vs external applications and real-world durabilityThe role of timber and biogenic carbon in constructionLinks and Resources:Weathertex: weathertex.com.auWeathertex video library: weathertex.com.au/resources/videos/Global GreenTag: globalgreentag.comForest & Wood Products Australia: fwpa.com.auPrefabAUS: prefabaus.org.auHosted by Dean Ipaviz, builder & director at Verdecon, creating high-performance, low-impact homes across Australia. Follow Dean Ipaviz and @_thebuiltenvironment on Instagram and visit thebuiltenvironment.com.au
- Mar 12, 202639 min
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:What mass timber and CLT are and how they store carbonPrefabrication, speed of construction and housing supplyFire performance and structural considerations with CLTHeat pumps, electrification and reducing operational energy demandUsing solar and thermal storage to flatten peak energy loadsWhy building fabric and insulation should come firstHow low-carbon concrete reduces embodied emissionsMisconceptions around set time, cost and performanceEnvironmental Product Declarations and carbon transparencyManaging construction waste and closing material loopsThe role of policy, standards and education in industry changeLinks and Resources:Sydney Build 2026 (April 29-30): sydneybuildexpo.comHolcim EcoPact Low Carbon Concrete: holcim.com.au/ecopactXlam - Cross Laminated Timber: xlam.coSurfers for Climate: surfersforclimate.org.au/Stiebel Eltron Australia: stiebel-eltron.com.auGreen Building Council of Australia: gbca.auGBCA Transform Event (Sydney March 17th 2026): gbca.au/courses-events/major-events/transformHosted by Dean Ipaviz, builder & director at Verdecon, creating high-performance, low-impact homes across Australia. Follow Dean Ipaviz and @_thebuiltenvironment on Instagram and visit thebuiltenvironment.com.au
- Mar 10, 202644 min
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:Designing a high-performance, all-electric homeGeothermal heating, cooling and thermal storageVentilation systems and indoor air qualityThe difference between HRV and ERV systemsWhy airtight homes require controlled ventilationManaging humidity and condensation risksThe role of solar, batteries and energy management systemsHow building fabric impacts energy demandCommon misconceptions about heat pumpsThe future of heat pump technology and refrigerantsTom 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:Stiebel Eltron Australia: stiebel-eltron.com.auYour Home guide to ventilation and airtightness: yourhome.gov.au/passive-design/ventilation-airtightnessHosted by Dean Ipaviz, builder & director at Verdecon, creating high-performance, low-impact homes across Australia. Follow Dean Ipaviz and @_thebuiltenvironment on Instagram and visit thebuiltenvironment.com.au
- Mar 3, 202648 min
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:How heat pumps workWhat Coefficient of Performance (COP) meansWhy heat pumps can produce 3–4x more heat energy than the electricity they useAir-to-air, air-to-water and ground-source heat pumpsWhy Australia’s plumbing systems have traditionally relied on gasThe shift toward all-electric homesSolar PV, thermal storage and hot water as a “thermal battery”Why building fabric and insulation matter before mechanical systemsTom’s own all-electric home and how it performs in practiceLinks and Resources:Stiebel Eltron Australia: stiebel-eltron.com.auYour Home - Guide to Environmentally Sustainable Homes : yourhome.gov.auHosted by Dean Ipaviz, builder & director at Verdecon, creating high-performance, low-impact homes across Australia. Follow Dean Ipaviz and @_thebuiltenvironment on Instagram and visit thebuiltenvironment.com.au
- Feb 23, 20261h 14m
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 sustainabilityThis episode is all about understanding forestry, carbon accounting, material performance and the trade offs involved in building at scale.The conversation explores:Why native hardwoods became the benchmark for durability and aestheticsThe limits of old growth supply in a housing constrained worldThermal modification and how it changes timber performancePlantation forestry vs native forest harvestingFSC certification and set aside biodiversity landCarbon storage in timber and how it’s measuredWhy embodied carbon is an immediate impactThe limits of “carbon negative” claimsPassive House, materials selection and lifecycle thinkingWhy composite decking may not be the environmental solution many assumeLinks and Resources:Abodo: abodo.com.auFollow Abodo Wood on instagram: @abodowoodAbodo's Environmental Product Declaration: abodo.co.nz/uploads/resource/Abodo-Wood-Environmental-Product-Declaration.pdfWatch Daniel's TedX Talk on The Future of Wood: tedxauckland.com/people/daniel-gudsell/FSC - Forest Stewardship Council: fsc.org/enPEFC (Programme for the Endorsement of Forest Certification): pefc.orgGreen Building Council Australia: gbca.auHosted by Dean Ipaviz, builder & director at Verdecon, creating high-performance, low-impact homes across Australia. Follow Dean Ipaviz and @_thebuiltenvironment on Instagram and visit thebuiltenvironment.com.au
- Feb 16, 20261h 6m
Cross Laminated Timber Explained: Carbon, Cost & Construction
Dean sits down with Sean Bull from Xlam to unpack cross laminated timber (CLT) — how it’s made, how it performs, and whether it can play a meaningful role in reducing embodied carbon across Australian construction.Sean shares his journey from structural engineering and post-tension concrete into the mass timber space, and explains how CLT panels are manufactured, pressed and machined in Australia using radiata pine sourced from PEFC-certified forests.The conversation explores:What CLT actually is and how it’s manufacturedFire resistance levels (FRLs) and performance pathwaysAcoustic considerations in multi-residential buildsEmbodied carbon vs biogenic carbon storageEnvironmental Product Declarations (EPDs)Forestry certification and sustainable sourcingThe impact of the Black Summer bushfires on timber supplyInstallation timeframes and on-site efficienciesCost comparisons with concrete structuresReuse and circular economy potentialWhether mass timber can realistically scale to meet housing demandSean also discusses a recent Luigi Rosselli project in Sydney and what’s required to bring CLT into mainstream housing, from design decisions to stakeholder.Links & Resources:Xlam Australia: xlam.com.auEnvironmental Product Declarations (EPDs) – Xlam: xlam.co/resourcesPEFC (Programme for the Endorsement of Forest Certification): pefc.orgResponsible Wood (Australian PEFC member): responsiblewood.org.auLiving Building Challenge: living-future.org/lbcLuigi Rosselli Architects: luigirosselli.comMass Timber podcast: masstimberpodcast.comHosted by Dean Ipaviz, builder & director at Verdecon, creating high-performance, low-impact homes across Australia. Follow Dean Ipaviz and @_thebuiltenvironment on Instagram and visit thebuiltenvironment.com.au
- Feb 9, 20261h 46m
Mould, Moisture Control & Airtightness in Modern Construction
Dean sits down with former builder and Passive House tradesman now working with Pro Clima, Stewart Scholten from Scholton Group, to talk about membranes, moisture management, airtightness and the shift happening in Australian construction.Stu shares his journey from carpentry apprenticeship through high-end residential construction, working with Bellavarde, delivering the first certified Passive House in the Northern Rivers, and transitioning into building science and product education.This episode is about understanding how better detailing, better science and better collaboration can lead to longer lasting buildings.In this episode:Why WRBs and membranes have become critical under recent NCC updatesThe difference between cladding and the true waterproofing layerRisk reduction in modern buildingPassive House principles and what builders can learn from themAirtightness and why it mattersWhat a WUFI analysis is and why it’s becoming essentialThe role of mechanical ventilationNatural materials vs synthetic materials in moisture managementEducation gaps in the building industryWhy site management and collaboration matter more than everLinks & Resources:Check out the Scholten Group: https://scholtengroup.com.au/Smart Plus Academy https://smartplusacademy.comPassive House Institute https://passiv.deAustralian Passive House Association https://passivehouseaustralia.orgPro Clima – Building envelope systems https://proclima.comHosted by Dean Ipaviz, builder & director at Verdecon, creating high-performance, low-impact homes across Australia. Follow Dean Ipaviz and @_thebuiltenvironment on Instagram and visit thebuiltenvironment.com.au
- Feb 2, 20261h 27m
Passive House: Principles, Performance and Practical Application
Passive House is one of the most misunderstood concepts in residential construction... often dismissed as “too expensive,” “too European,” or “not suited to Australian climates.” In this episode, Dean sits down with Daniel Kress, founder of Smart Plus Academy, to talk about what Passive House is, how it works, and why builders need to understand it.Drawing on decades of experience across Germany, Ireland, Canada and Australia, Daniel explains the building physics behind comfort, airtightness, moisture control and energy use, and why most Australian homes still get these fundamentals wrong. The conversation also explores cost myths, window performance, the limits of NatHERS, and how better design-build integration can dramatically reduce construction risk.It’s a practical, builder-level conversation about performance, process, and why understanding Passive House principles can make you a better builder.In this episode:Daniel’s journey from German carpentry and prefab construction to Passive House educationWhy Passive House works in all climates, including AustraliaThe science of comfort: temperature, humidity, CO₂ and health outcomesAirtightness explainedThe difference between Passive House, Passive House principles, and greenwashingWhy certification existsCommon misconceptions around costReal numbers: additional cost per m² and where it’s actually absorbedWindows, condensation and why double glazing alone isn’t enoughUPVC vs aluminium vs timberWhy NatHERS misses critical performance issues in real buildingsHow builders can take control earlier through site selection and design inputWhere AI is already reshaping design, costing and performance modellingWhy Passive House forces better communication between designers and buildersThe long-term financial, health and comfort benefits of getting it rightLinks & Resources:Smart Plus Academy https://smartplusacademy.comPassive House Institute https://passiv.deAustralian Passive House Association https://passivehouseaustralia.orgPro Clima – Building envelope systems https://proclima.comNatHERS energy rating scheme https://www.nathers.gov.au/Hosted by Dean Ipaviz, builder & director at Verdecon, creating high-performance, low-impact homes across Australia. Follow Dean Ipaviz and @_thebuiltenvironment on Instagram and visit thebuiltenvironment.com.au
About The Built Environment
From homes to high rises, the Built Environment shapes everything around us. This podcast is about asking better questions about construction, design, sustainability, and how we live. Whether you're a builder, architect, homeowner, or just curious, this is a space for open, honest conversations about the future we're creating together.
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