Home Style Green

I'm joined again by Sharon Robinson and Glenn Harley for a chat about the possibility of builder self-certification and MBIE's updated weather files. 

Wao Summit 2024 is happening next week, 29th October - 2nd November. Speakers include John Bell, Monique Kelly, Dr. Jim Salinger, Alec Tang, Jane Lloyd, Dr. Greg Bodeker, Sam Gibson, Paul Spoonley and more! Tickets and information https://www.wao.co.nz/summit2024

I caught up with Glenn Harley and Joseph Lyth to talk about the recent Passive House conference in Wellington, and other building issues in Aotearoa. 

https://www.resilienz.co.nz/

Notes from RMBA's Constructive Industry Forum. 

Wao is a collective dedicated to a regenerative future. I caught up with co-founder Monique Kelly to discuss why she does what she does, and their upcoming Summit.  For more information check out https://www.wao.co.nz/summit2024 

99 Waiwai Drive, Milldale north of Auckland looks like a regular new house in a regular new subdivision, but around 30 people visited the site mid-build to see why it's different. This showhome will be one of the Platinum Homes high-performance range. It's a SIP (structural insulation panel) construction and achieved a near Passive House level of airtightness.  I caught up with Sam Watt, the General Manager of Platinum Homes, Rodney.  https://www.platinumhomes.co.nz/our-homes/house-and-land-packages/99-waiwai-drive-milldale/ https://formance.co.nz/

Kirsty Merriman is a property developer who is conscious about the type of homes she delivers. She's interested in sharing her knowledge about profitable and responsible project management. https://kirstymerriman.com/

In this episode of Build Aotearoa, I explore the concept of building circularity and its impact on the construction industry. Learn about deconstruction vs. demolition and reflect on the reduce-reuse-recycle hierarchy. I also discuss the role of polystyrene pods and alternative fillers in concrete slabs.  Be sure to check out recent episodes of the Passive House Podcast from the Passive House Accelerator for more on building cicularity.

The New Zealand Building Code does not guarantee performance in all areas that many homeowners might expect. Fortunately, Homestar is available to close the performance gaps. Homestar Headline Benefits •    Fresh air •    Dry •    Comfort •    Carbon   Homestar Design Checklist This is a summary of the basic requirements over and above basic building code compliance for achieving 6 Homestar v5. Inclusion of everything here does not guarantee compliance but is a starting point for what should be considered. Homestar Designer: This can be someone within the project team or an external consultant. Engage them in the process as early as possible. Energy model: Homestar v5 uses predicted performance criteria rather than a schedule of allowable insulation levels. The performance criteria include estimated energy consumption, winter and summer internal temperature and likely carbon emissions and these can be calculated using the Energy and Carbon Calculator for Homes (ECCHO). Energy modelling used to be a highly specialised process and expensive process. ECCHO makes energy modelling accessible to Homestar Designers Continuous mechanical ventilation: Internal moisture is a significant problem for New Zealand homes and there is adequate evidence that the building code requirements of openable windows is not reliable for providing enough fresh air and removing dampness. There are simple solutions available for 6 Homestar that are nearly silent, cost very little to run and will provide much more reliable benefits to homeowners. Thermally broken windows: Pay attention to the window frames, not just the glass. Slab edge insulation OR above slab insulation: Junctions such as the connection between walls and floors are risk areas for condensation. Some additional insulation detail can help prevent this and can be easily incorporated when considered early. Water efficient fittings: These are commonly available. Select the best WELS rated products.  For more, visit https://nzgbc.org.nz/introduction-to-homestar

Scott Fisher is the CEO of Offsite NZ. I caught up with him to discuss the history, current practice and future opportunities of offsite manufacturing in the building industry in Aotearoa.  https://www.offsitenz.com/

While researching a presentation to open the NZGBC 2024 Housing Summit, I looked into the climate initiatives of Europe and the US.  In Europe, over €83b has been recently been committed by the European Parliament as part of the Energy Performance of Buildings Directive. The ultimate goal is that the building sector will be climate neutral by 2050. Importantly, there are interim goals for 2030 and 2040, which encompass both new buildings and retrofitting existing buildings.  https://energy.ec.europa.eu/topics/energy-efficiency/energy-efficient-buildings/energy-performance-buildings-directive_en Over in the US, there is the Inflation Reduction Act which will see a staggering $783b invested into energy security and climate change initiatives.  https://www.whitehouse.gov/cleanenergy/inflation-reduction-act-guidebook/ Back here in Aotearoa, aside from recently updating H1 Energy Efficiency in our building code, MBIE has laid out a programme called Building for Climate Change.  https://www.building.govt.nz/getting-started/building-for-climate-change The implementation plan for BfCC has reporting requirements suggested for 2025. 

This week I attended a BRANZ seminar titled 'Building for our changing climate'. Tāmaki Makaurau Auckland was the last stop on the BRANZ seminar tour of the country and it's encouraging to think that rooms of designers, builders, product suppliers, building officials and others, were interested enough in this topic to take four hours out of their week.  A key takeaway is that we're not prepared. We're already handicapped by having insufficient standards in our building code to deal with our current climate. With the forecast being 'warmer and wetter', the situation is set to get worse. https://homestylegreen.com/?p=5936

Steve Penny is the founder and director at Honoris, a building services consultancy in Christchurch, New Zealand. He is also the host of his own podcast, A Penny for Your Thoughts.

Many people might be surprised to know that the New Zealand Building Code does not require any consideration of overheating in homes. The energy efficiency requirements in our code are based only on the ability of buildings to keep warm without excessive heat loss. There is nothing to prevent homes from being designed with large areas of unshaded north or west-facing glass. Siân Taylor is an Architect and Passive House Designer based in Queenstown. She has experience creating homes that are designed to perform well all year round, in some of the most challenging and spectacular locations. Follow Siân on Instagram and check out Team Green Architect's latest work at https://www.teamgreenarchitects.co.nz/.

Stärke has been in the window industry in New Zealand since the 80s. They were at the forefront of supplying aluminium frames to the building industry but have recently made some big changes. With a focus on building performance, Benjy Simmons describes the new direction of Stärke as a 'once-in-fifty-year' change. While the company has a long legacy, they've experienced rapid change over the last few years.  Benjy credits some of the openness to change to him being from outside the industry. He's come in with a different perspective. "We're beginning to see ourselves as a building performance company not just a window and door company", says Benjy.  Check out the full range of Stärke products along with their education pages and other resources.

More is not always better, especially regarding the amount of timber in the frame of a house. The more timber there is, the less space there is for insulation. The way this is measured is called timber fraction. Most homes in Aotearoa are designed using the assumption that timber will make up around 14% - 18% of the area in a wall. A 2020 BRANZ research study found that in reality, the average timber fraction is closer to 40%. This means there is considerably less space available for insulation. Unfortunately, this is not always picked up during the consenting or pre-lining inspection process. H1 Energy Efficiency calculations are checked at the design stage, usually using the much lower default timber fraction assumption. The result of all this is that many consumers are effectively getting less insulation than they're paying for, and much more thermal bridging.  PlaceMakers has recently launched a new service providing a detailed report of the actual timber content for any wall frame and roof truss they supply. This accurate figure can then be used to provide true H1 calculations. Alternatively, a designer might choose to adapt their plan to reduce the thermal bridging and increase the amount of insulation. National Technical Resource Manager, Pete Hammond explains how Framology works. We also discuss the option of using external insulating products like RigidRAP-XT from IBS to eliminate thermal bridges.