timber and passive house

The Sustainable Match: Timber and Passive House Collaboration

Foreword by Ian Thompson, Editor

The Future of Sustainable Living: An In-depth Look at Passive House

Today, we’ll be delving into a topic that resonates with many of us – the increasing costs of energy and how we can make our homes more energy-efficient, but importantly, also healthier for our families.

We’re all familiar with the feeling of frustration when we pull into the petrol station and see the prices on the rise. It’s a pain point for most of us, and yes, even for those of us on motorbikes – like me.

In this video, we’ll be talking about the present situation with escalating energy prices and speculating on their future trajectory. The focal point of our discussion will be the passive house building standard, a solution that could help us save money and contribute positively to the environment by reducing energy consumption.

We’ve talked about net zero in the past, and it’s important to clarify that it’s not the same thing as passive house. Net zero simply means that you’re generating the same amount of energy that you’re using, whereas the passive house standard aims to make your house as energy efficient as possible, creating an optimal thermal building envelope in combination with low energy requirements to create a healthy and comfortable environment for you and your family, with minimal running costs.

Our speaker, Daniel Kress of the Smart Plus Academy, will help demystify the concept of passive houses. He’ll delve into their origins, how they can be adapted, the economics of building passive houses and debunk common misconceptions about their costs. He’ll also dive into the technical aspects of passive houses, such as standard requirements, ideal wall structures, and why steel framing might not be the best option.

Daniel will also touch on the broader implications of our energy consumption and its contribution to global warming, emphasizing the urgent need for immediate and profound emission reductions across all sectors.

There’s no doubt that the Passive House movement is growing in popularity, but it’s also important not to get caught up in the hype that some organizations will market because, like everything, there are gotchas. I’ve seen horrendous price gouging with clients getting taken advantage of, just because they want better. So, as always, research your needs, and shop around. Designing and building a passive house (or near standard) doesn’t need to be difficult or expensive. It’s all about adopting a simple design, choosing the right building system, and specifying the right sustainable products – something that’s important to our ABA community.”

So, let’s get started on this journey to understand how we can make our homes more energy-efficient, and healthier, with passive houses.

Video Transcript

Who hates it in a moment to go to the petrol station and pay for your petrol and feels this pain? Please put a warning toward the chat if that is the case if you’re having that. If you have that pain as well going to the petrol station, yeah, especially if it’s a ute or something like that, super super annoying.

So please use the chat for communication with me as the speaker so I see that you’re still there and not just talking to the wall if that is not a pain point for you in the moment. Uh, you’re lucky, you might be just using a bicycle. But our prices definitely went up over the last, over the last year and we never know where it is going over the next few years.

So let us talk, like in my presentation. I first will talk a bit about the situation that we’re facing right now, uh, that already started to talk about right now. Then I will speak a bit about passive house, uh, and where passive house comes from. I bring it then to Australia, and then we look to Australia how it is actually impacting Australia and how, um, how the, uh, how economical it is actually in Australia to build, uh, build passive houses because sometimes that’s something there’s always a discussion and how much does a passive house cost?

After that, I explained you a bit the standard. And after the standard, we go into uh, detailing and build ups of wall structures that are suitable for us here in Australia, obviously in Timber CLT and framing. I give you as well some ammunition regarding steel framing, um, so why we shouldn’t go down the steel framing route at one point. And then after that, I give you a little bit a goodie regarding our offers that we have that you can then get. So at the end of the presentation, I’ll give you a little bit something you could use, okay, perfect.

So let us start. So Timber and passive house, the solution for a better future. I think we can agree that Timber is really a good product we want to use, um, then what’s the situation right now? Energy prices are going through the roof, uh, as well here in Australia, luckily it’s not uh hitting us as hard as Europe with that Russian war that we’re having right right now.

So we’re having more the situation here that fuel prices are going up a bit, the rest of your energy is going up a bit. But if you look to uh, the UK for example, the gas prices went up by five volts. So if you had your heating bill and it was a thousand dollars, uh, it’s now five thousand dollars, painful. And that’s what we try to avoid, so um, the fuel prices are going up to the roof.

Question, would you like to, uh, would you like to cut your petrol, uh, Petrol in your car by tenfold? So if you’re cutting your petrol, cause a petrol need by by 10, so ditch a digit. How would that be for you? Please, if you would like that, uh, please put in there a one into the chart.

Please use the chart if you’re allowed to use the chart to, now I’ve seen only a good solution, maybe now I’m not sure if that is working for you guys. Can somebody try to use the chat and see if that is working or is the chat switched Off? Uh, it’s only, okay, it’s only in the Q in the only q a is working for you, okay, fair enough.

So uh, in that case, I just go through it and uh, I let I ask the questions but you probably can’t engage with me. And now, now you can engage with me, perfect, cool. So thank you. So if you would like to cut your petrol prices, like your petrol needs, uh, by a digit, uh, that would be great, thank you, uh, now let us go to the second part, um, so instead of 10 liters per 100 kilometers, one liter per hundred kilometers.

That would be pretty amazing, um, who would, who would be willing to spend another three thousand dollars on a thirty thousand dollar car? Please put a two into your into the charts then, number two, if you were, if you’re willing to spend an additional three thousand dollars on your car to actually getting that cut off your running costs by 90 percent, okay, perfect.

So what would, would it be if it’s just cutting your petrol costs by half? Yeah, so if you’re cutting it only to half, would you still be willing to spend the three thousand dollars? Uh, please put a three into the chart if you’re still willing to spend an additional three thousand dollars on the thirty thousand dollar card to cardio petrol costs by two, half, perfect, uh, that is exactly what passive house is offering, yeah, passive house is reducing uh the energy demand for heating and cooling by a tenfold.

That’s only Heating and Cooling or a cut. So it’s uh, it’s uh, it’s ditching a digit at the end, uh, you only need 10 or for an additional investment of 10. So on a 30 000 car, three thousand dollars is that ten percent, um, the overall domestic fuel that means as well your lighting, your fridge, your cooking, uh, your uh, all these devices together, and this circumstances passive house. Cuts your domestic fuel to have.

And that’s the reason I ask once for a 90 reduction, three thousand dollars, yes. But that is only Heating and Cooling, but when we’re looking over the overall energy consumption of a building, it cuts it to half and people are still willing to uh, to uh, pay another ten percent if it’s the car, yeah.

So what’s the situation right now in the in the moment, uh, like we we just have cop 2020 27 running in Egypt. And when the last report came out earlier this year, they were saying it is now or never. If you want to limit global warming to 1.5 degrees without the immediate, immediate and deep emission reduction across all sector, it will be impossible to achieve that 1.5 degrees.

Let us be honest, I think the 1.5 degrees is most likely not happening. If you want to achieve it, we would have to come to the pivot point in 778 days, or like less than 779 days, to pick our seo2 emissions. And from that day, it needs to go strongly, strongly, download, like a really steep downhill, um, I don’t see that happening. So maybe it’s going up to 1.6789, we will see where it goes. But every little thing counts, yeah, so I think that’s important.

When we look to the global, global emissions, buildings are responsible to afford 21 of global uh, uh, global climate change, uh, emissions. It’s not just CO2, uh, it’s uh, it’s CO2 equivalent in this calculation. And that’s 21 percent is coming from buildings, yeah, we can make a difference with that, yeah, um, in Australia, no, in the world, when we look to the world, um, uh, CO2 emissions, just CO2, not all methane, all the other gases that we are meeting.

Then the building industry, uh, plus the use of buildings is 39 of the overall. So about 40 percent is the CO2 missions, with 17 is the residential side, 11 is the commercial side, and 11 is the industry on its own. So that means building the houses, but as well infrastructure, um, so that’s the situation that we’re in.

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How could we with our industry make a difference? You’re already making uh the right choice by the material if you’re building this timber because Timber is, uh, is a CO2 uh, or like a carbon capturing way that we can use. So let us look to passive house. So what is passive house? Password files are normal buildings built better, that’s all what’s it about, yeah, uh, passive house is the foundation for healthy and sustainable buildings that are economical.

I always say passive house is an economical optimization tool for my project because we are applying uh, we are applying the science and we’re going back to the roots to really what is happening and applying now the science on top of that. And then we can make economical Decisions by our results, not like with The Nutters assessment. We don’t know what another NASA assessment is really changing like we see how the nut assessment is changing but we can’t really tell by the result of the nut assessment how much the heating bill or cooling bill is in fact impacted by that.

So passive house is just imply buying the laws of physics and economics. So what is passive house doing? Passive house separates the indoor environment from the outer environment, while the outer environment is changing, the indoor condition stays between 20 and 25 degrees the whole year route. So in other words, the indoor environment is inert to the outer environment or the indoor environment is hardly impacted by the outer environments.

So that’s that’s what passive house is achieving. So certified passive houses if you want to find them there’s this passive house Darton Bank database where you can find all the passive houses. And here on this graph you see how uh the numbers of passive houses since 1998 are going up to 2021. We see it here just the beginning of the hockey stick. I think this is going steeper and steeper and steeper and uh we will have an exponential growth on passive houses because it is the foundation for uh better buildings, for future buildings of the future.

I don’t think that passive house is the best way we can build. I think it’s the worst worst worst way we can build but we always can build better. Yeah passive house is the lower standard that we should achieve but we can always do more. I show you a little bit today why that is my belief. There is some short like some places where you could do a little bit less than passive powers. But normally passive the passive house standard is your really safe way to make sure that your clients have a healthy home. That you do something for the environment and it stays affordable.

Good.  So over 30 000 units are built and I think now it’s over a 3 million square meter of treated floor area.  So conditioned space, so passive house is really looking at the energy consumption of the building over the lifetime of the building.  However the embodied energy is something we need to look at as well. Yeah so the embodied energy we normally say here in Australia. 

The pivot point where the embodied energy and the use of the building energy is coming to a balance.  So it’s 50 50. Is at a 20 years time yeah so after 20 years the embodied energy in the building and the use of the building is the same amount of energy.  We want to build for a century not just for 20 years. That’s the reason why the the use of the building is so much more important than actually the embodied energy.

But we need to tackle it as well because of the energy reduction pacifiers. I would say it’s at least 30 years not 20 years where we could come to um to this balance. Generally speaking I’m saying we’re having 20 imported in 80 Percent use of the building. If you’re building a durable building that stays there for a century, that’s where we are at, and the most sustainable energy is the energy that we don’t use.

Like I said before, you are already using timber. Timber is a renewable material. The timber carbon content is 50, so 50% of your dry timber content is carbon. If you translate it into CO2, that is actually more than a kilogram. It’s between 1.65 and 1.8 kilograms of CO2 stored in timber because we’re storing the carbon. We’re not storing the oxygen. That means this timber, we can store more carbon that is actually the weight of the timber itself. So that’s something good to know.

Then, it’s a durable building method we have here, the OG temple in Japan that was built in 711. After that, so that’s like over a thousand years ago, we can build timber structures that can easily maintain for 100 years, 200 years, 300 years. And then the global wood production trade has increased by 143% since 1990 to like in a 20-year timeframe.

That shows that timber is a good material. The evaluation or the depreciation of timber is going up, and I think it will go up more and more because it’s such a great material to work with. It’s warm, it’s sustainable, it’s easy to fix, it’s easy to create things out of it, and it has a big variety of uses from structural to finish, even making tools out of it. But I don’t need to tell you about timber. TimberView world, I’m a chippy as well, so I’ve worked for 10 years with timber, so I know this part.

Now, let us look to passive house in Australia. So passive house movement started in 2013 with the first passive house, and that was actually a concrete block construction. So the first build was concrete. The second building that wasn’t a new build, that was an existing timber structure that was retrofitted in Victoria.

Then, in 2017, we got the first apartment block in concrete structure, The Fern in Sydney. Then we had a steel construction in 2020, the first university building in steel. Like not it’s a university building, we had as well the, what’s it called, Gillies Hall that was CLT in a similar timeframe, just before this one, I think it was 2019.

That was as well my cover picture I used at Skilly’s Hall in Victoria. And that was a CLT building, amazing result with that one. And now the major developer got on board in 2021, I think of us Fraser if I remember right. In Australia, we have over 50 certified passive house projects so far that you can find.

It’s far more than that, but not everybody wants to let people know that they’re building passive house, so that’s the reason I have to keep it smaller. We’re probably closer to 100, I would say. We realized a lot of projects below $2500 per square meter treated floor area, even right now one in Victoria is just about above that, even in this climate with 2550.

And then passive house does not need to be expensive. It’s something that a lot of people think it’s not need to be expensive, and I want to show you later why. And it’s ideal for social housing and affordable housing because running costs are pretty much cut to half for the operation, and in affordable housing, the heating and cooling are normally higher because they spend more time at home, so that has even a bigger impact. So passive house is really if you want to be social, it’s the right place as well.

And we want to be fair. So how energy efficient is a passive house? So from a systems perspective, we allow 10 watts per square meter heating and cooling at your location. It doesn’t matter where you are at your location. You’re allowed to use 10 watts. So that means a 1.5-kilowatt split system. That’s super, super small. You normally don’t get such small split systems. The bitter smallest normally start about 2.998.40 kilowatt. You can already condition 150 square meter house.

So what does that mean in Melbourne? Yeah, where we have minus 2.5 degrees as the lowest temperature that we can have over there. We can maintain the temperature between 20 and 25 degrees with a thermal insulation thickness of 140 millimeters for a 150 square meter house with one split system. Yeah, that’s now Melbourne minus 2.5.

If you’re going to Charlotte Pass in New South Wales with minus 23 degrees, there we want to maintain the same temperature, 20 to 25 degrees. And here we need now 340 millimeters of insulation to achieve that. And then we again need only a split system of 1.5 kilowatt for the 150 square meter house.

How energy efficient is that? That’s now also Western Australia with the highest temperature ever measured, with 50.7 degrees, January 2022. That’s the highest temperature measured in a village or town. We want to maintain the temperature as well between 20 to 25 degrees.

Now we need 250 millimeters of insulation because we want to keep the heat out. Thermal insulation doesn’t know where the inside or outside is, so it protects us from the heat and from the cold. So here we need now 250 millimeters against the heat. And now the split system that we need is again 1.5 kilowatt hours for the 150 square meter home.

I said it now already multiple times here, that’s what passive house is doing. Passive house cuts the energy consumption to half. So this is what passive house is doing as a basic figure. If you’re not going over the top, we just achieved the basics of passive house. You can always optimize it further and probably cut it to a quarter.

So we’re taking 75% away from our running costs. But let us be pessimistic from a passive house perspective and say we only cut it in half. So we’re able to save about $1400 a year. That’s the calculations, that’s the amount that I’m using for my economical calculation in a few slides later. So passive house is comfort with clear conscience.

So in other words, you can live in a really comfortable house that is always warm in the winter and it’s always cool in the summer, and you don’t have to worry about how you achieve that because you’re living in a passive house. You are not contributing too much to global warming or not at all.

Like I said before, passive houses are normal houses just built better. The additional investment costs in Australia are between $250 and $750 per square meter. This equalizes to 5% to 20% in residential buildings and can be as little as 1% from commercial buildings because they’re bigger projects, then everything gets cheaper.

As well, the Russia used area internally and building envelope gets more favorable. That’s the reason it works. Now we look at our spa home. So that’s 120 square meter, 125 square meter home. That’s the house that we’re modeling in our certification course, in the designer course. And now we’re looking at the cost of this house. So if you say the square meter rate costs for the house, low quality $2500, then it’s 15%. If you say it’s $5000, it’s 8%. If you say we’re spending $7500 per square meter, then it’s 5%.

And then we see the costs of construction for this building. These are realistic figures in Sydney, I would say in Perth we could even drop that further a little bit. To the layout of the house, we have three bedrooms, one bathroom, a WC, a laundry, a kitchen, a lounge, dining, and a dining area. We have no leisure area in this building, but it’s, I think, already a really good building, really typical European layout of the whole thing.

Here it shows us the additional costs. It’s $48,000 for their passive house components. Yeah, that’s the additional costs we have to spend in Sydney in March 2022. I got a quote for the windows for this project. It was less than $10,000 to supply all pacifiers Quality Windows. No problem. So now what we’re doing, we’re changing the building to a long single-story building to avoid single-story building and to a terraced house.

Yeah. Here, upper and lower floor are behind each other up on lower floor next to each other. And now it’s still that two-story building but is now a terraced house in the middle of a row. So how is that impacting our economics? So keep in mind, the freestanding 125 square meter house is an additional $48,000. That’s the reason we have that sticky note on here. Now the long single-story building is now coming to an additional cost of $64,000. So that’s another $16,000 just because we’re going single-story behind each other.

If you’re going for the wider option, we bring it up to $59,000 additional costs. And if you go for a mid-terraced house, it’s an additional $26 instead of $48. Why is that? Where is that coming from? It’s really simple. Here we have to add the same amount like we have to double the amount of roof and we have to double the amount of concrete slab. And this is the area where the energy can escape and that’s the reason why this one needs more energy similar to this one.

It’s just a bit more ideal because the long side of the building is now connected to each other instead of the short side and that’s the reason why this one is a little bit cheaper when we put it next to each other. And here it’s less because these long sides of the building, they are not protected by the other buildings and that’s the reason why we don’t need the thermal performance there.

That’s the reason why terraced houses are cheaper. So you can get the same outcome of the building for $26 as a terraced house, $48 as a freestanding one, a two-story build long single-story build for $64, or white building for $59. Yeah. Choosing the shape of your building wisely has a massive impact on your clients regarding the costs, yeah, not just for Passive House but in particular Passive House because Passive House is telling you how much better you have to build this amount of walls because you’re having a bigger envelope area to the same internal condition space.

It’s a bit much but I want to show you what that is. I would normally spend more time on that if it would do the whole presentation. There’s like a Passive House in Australia. Is it too expensive? It’s a webinar on our website that you can buy as well with CPDs if you want to know more about this. Here’s just an example of a typical Australian house as we know it. Yeah, 320, 328 square meter house total envelope area. The additional cost is now $1300 to make that Passive House.

But yeah, pretty roughly calculated the additional simply if you know simplifying the shape by putting getting that into that simple shape then we’re saving already $40,000 and if you’re now looking to the additional cost with the savings from the conventional building included then we’re saving $100,000 because of the simpler shape. So we’re saving $40,000 for the Passive House, $60,000 for the conventional building. And now the additional cost for this big house is $30,000.

How does that look now for the different finishes, two and a half, five and seven normal building? Here, it’s that’s our costs. 15% is Passive House, 18% and 5% if you’re not changing the shape. If you’re changing the shape, the additional Passive House cost is 10%, 15%, 23.46% and 3.6%. If you’re keeping, if you’re including the savings for the conventional part, it’s only 1.2% additional costs.

So Passive House doesn’t need to be expensive. We have to be smart about how we are designing it. And now when we are comparing the 120 square meter house to the 328 square meter house, the spa home to that conventional Australian build, this additional 200 square meters are giving you one bedroom, one bathroom and one additional toilet and a leisure room. So in other words, for four additional rooms, you need another 200 square meters. Something is wrong with our designing.

Yeah, something is not right. So maybe we can improve our design practices in general to make a building more economical as well covered in that webinar that I just spoke about. So if you now look to this additional financial burden per day, so this is now that that’s the building cost we spoke about, this $48,000. Yeah, that’s the amount of money we have to have available during construction cost.

But what is now the additional financial burden? What’s what’s the limitation of my lifestyle because I’m going for Passive House and I have now more mortgage to pay? Yeah, that’s what we’re doing here with this financial burden because I invested that $48,000 but my running costs are going down, and now the question is: what’s the impact to me as the end user? And that’s what we’re showing here.

So, the financial burden in the first year is a coffee a day. So, one takeaway coffee a day is your financial burden. So, if you reduce your coffee intake or change your habit from having a coffee outside to having a coffee at home, then you’re already able to finance your passive house.

After 10 years, it’s a 7-Eleven coffee, yeah, it’s only $2.77 now and it’s a large one, so that’s what you’re having. After 19 years, we come to financial pivot points. So, at this point, we have no additional financial burden to the user and then the loan is paid off after 30 years. We’re getting every single day a free lunch of fifteen dollars, yes, so this is why passive house is economical and why passive house is creating a return of investment.

And you’re spending that money upfront to secure your future. You don’t know how your energy prices are developing. They could go up by another 100, another thousand percent, or they could drop down to 50. We don’t know, but it’s more likely that at least over the next two, three decades that the energy prices are going up.

I think in 50 years they start to pivot down again because renewable energies will be so cheap, but that’s another story. Cool, so that’s the economical calculation, what I showed you. Now, in the economics, you can do that in the passive house. Passive house in Australia, is it too expensive? That webinar will give you a really good overview of that. But let me now explain how the passive house standard works.

So, passive house has a really clear outcome, yeah. So, what we want to achieve is a thermal comfort zone between 20 and 25 degrees and a relative humidity level inside the building from 30 to 60 percent. That’s the comfort. There’s far more things that we’re trying to achieve but simplified, that’s what we try to do.

On the environment, we try to have it mold-free and for this, we have to make sure that our surfaces have a relative humidity below 80 percent. So, a cold spot is a mold spot. So, when we have a thermal bridge, we could have the temperature dropping that far that the relative humidity on that area is now 80 and now we have mold growth.

So, you always see the more growth in your corners if you’re in a cool-tempered climate. If you’re in a hot climate, it’s probably rather on the condition, it’s rather behind your internal walls when you have like a picture hanging there, then you see mold there. But in cold-tempered climate Sydney and coal then it’s normally in your corners, cold spots, and mold spots. And that’s normally external walls when they are meeting or when your floors meet the external walls. So, that’s what we try to achieve.

Then air quality, we want to make sure that the CO2 levels in the building are below 1000 parts per million (PPM). Naturally, we have about 300-400 parts per million in the air, now it’s already 450. So, we allow that to go up to 1000 parts per million, usually it goes up to 1500-2000-3000 in a building if it’s not properly ventilated.

And to achieve this outcome, we have always the same allowance, yeah, we allow exactly the same heating demand. So, how much energy are we allowed to use is 15 kilowatt hours per square meter, a heating load that’s now the size of our system. So, that’s our split system in the example from before, the same on the cooling side.

And then we have our primary energy demand or primal renewable energy demand, that’s the energy. So, if you say we’re using coal, yeah, that’s the coal still in the ground, that’s the amount of energy that we’re allowed to use. The 120 kilowatt hours, so that coal in the ground now, we take it out, it loses a little bit of energy, now we have to transport it, loses energy, now it needs to be burned, it loses energy, it needs to be transported to the house, it loses energy, and then it is delivered to the house.

So, this is the primary energy, yeah, where it comes from. So, if you’re using coal, it’s a coal still in the ground and all the energy needed to extract the coal and use the coal is included in this one.

And then we have our quality control, we test for air tightness, we do a heat recovery ventilation commissioning report, we have a project documentation, the thermal bridge analysis, and then certification process of the passive house standard.

Cool. So, um, how much energy does that mean? Like if you have a 24 square meter living room, so it’s a normal-sized living room, we could have four tea light bulbs running with 60 watts, so the old ones, then we could have a small radiator running, we could have eight tea lights switched on and they maintain the temperature on the coldest they ever recorded, or we have a hair dryer running, or we have a supply air.

So, we have our supply air supply at 50 degrees, so it’s supplier heating. It’s a passive house thing. So, this is how we could actually do it with these five different methods. Eighty lights is enough to maintain the temperature on the coldest day of the year, uh, heating with select direct electricity is obviously not wanted for thermal comfort.

So, if you know a bit about thermal comfort, we have this ISO 7730, we have this less comfortable, that’s the lighter yellow that we’re having here, less comfortable survival zone more or less, and then we have this darker yellow that’s the normal comfort zone defined by this standard. But passive house goes further.

Passive house is stricter. It says from 20 to 25 degrees and from 30 to 60 relative humidity. Why is passive house doing that? It’s pretty simple. If you go drier, the air is too dry and we get dry skin and then the membranes are cracking in our skin or in our throat and then we’re getting sick, yeah, it gives us pathways for bacteria and viruses.

If it’s higher, then we have the risk of mold growth. And if you go higher than 25 degrees, then we are not sleeping that well any longer. So, above 25 degrees, sleep is really not good. That’s the reason why we say we are sleeping in the place as well. It’s not just for activity. That’s the reason we say, um, the passive house standard goes only to 25 degrees.

Then we have three different standards. So, we have the new build standard, that’s the passive house standard like everybody talks about, then with the inner fit standard, that’s for renovations, so it’s not as strict as the standard itself, and then we have the low energy building standard. I call it the PD plug because you’re getting this if you’re not achieving either of them, mainly missing the 0.6 at tightness mark.

You’re allowed to have one air exchange in the low energy building, so, um, this is still really good compared to conventional buildings but it is not a passive house. It’s a low energy building as defined by the passive house institute. So, I need to point that out because a few people selling that now is passive house. This is a real passive house. This is a retrofitted pass a thousand. That’s a low energy building standard by the passive house definitions.

Then we have these criteria for these three standards. It’s transparent, it’s clear defined in a clear defined requirements. It’s defined by the passive house institute. It’s precise, required, must be fulfilled. It’s freely available. Anyone can build it, anyone can design it. You don’t need to do the courses but you need to fulfill the standards and you need to go through the certification process if you want to have a certified passive house.

And it’s legally, it gives you a legal certainty for an outcome and it’s legally binding. So, if you’re somebody that stays for quality and he’s always getting annoyed when your quotes are underpriced because they’re tricking the client by giving them less than you would love passive hours because you can’t underprice the passive house. You have to deliver a passive house.

Obviously, you can still do that with the finishes but the performance of the building they can’t make compromises. So, if you’re somebody that stays for quality, then passive house is your secret weapon because nobody can underprice you if they have to deliver a passive house because that’s the quality that is required.

And you can now deliver quality and be sure that nobody can underprice you because they’re binded by that law of the regulation. And then it’s certified, currently valid, and you can find the current value variation. So, the certification process is really, really rigid. There’s like a certifier, they need to be certified, certified for passive houses to check all your work, they help you to achieve it as well and say, hey, there is something maybe you want to look at that again to improve it.

So, it’s as well a learning process for the people that are going through that certification process. So, you’re learning visit and you’re delivering something better. Now that was the standard. Two things I would like to point out is air tightness and thermal bridging because these are things that are always coming up. So, I want to just put it into my presentation that you hear about it no more leaky buildings would be lovely to see that.

So, air tightness systems need to be continuous, they need to be structural, they need to have a structural integrity, yeah, they can’t be just floppy and not installed properly. They need to have a durability and then it, uh, they can’t be in, um, can’t be inflated by air.

So, it needs to be air permeability needs to be zero. Now we have two types of leaks. We have an energy leak, yeah, that means the hole is so big that there’s so much air going through that we’re losing a lot of energy. And then we’re having our moisture leak. Now we have a smaller hole often as well going in the structure, moving through the structure somewhere and then coming out at a completely different area.

This is now emotional because the air is now moving through destruction has enough time to cool down and now we have condensation in the structure. This is the old standard. This is where the standard is moving to in the moment, yeah. So, from a structurally sound construction that was using that that used a lot of energy to maintain a comfortable indoor environment that can’t even be achieved because air gets dry in the winter.

They’re now moving to this structure that is not structurally sound any longer because we have now rot, we have now problems in the structure. It’s a half measure. And now air tightness will get a bad name because modern buildings will be more moldy and will have more moisture problems and mold problems because of doing half measures, yeah. It’s like air tightness is a little bit like pregnancy, you do it or you don’t do it.

Yes, so you can’t be half pregnant. That’s a little bit like the air tightness, please, please, please, if you do air tightness, bring it at least under three air exchanges, it’s the bare minimum, but really try to bring it below the one air exchanges if it’s a new build, it’s not a problem with a little bit of detail and thinking, uh, it can always be achieved super, super easy. 

The 0.6 for an experience, the airtightness installer, 0.6 is as well apiece of cake, uh Soum when the industry is a bit more ready, then everybody can achieve the 0.6 in a moment. I think one would be really good, um, three is the bare bear minimum, never ever do more than three, uh, it’s only, uh, asking for problems.

Otherwise, build your glorified 10 with air exchanges above 10 exchanges. Um, air tightness here we have just diffusion in an airtight structure. Yeah, 140 millimeter of thermal insulation, uh, it’s, uh, 0.5 grams of moisture are getting into the structure just by diffusion not by air, air leakage. Now we are cutting a one millimeter Gap over one meter length, so that’s fugit, that’s a gap over one Milli uh, over one meter. This one millimeter Gap is now causing 800 grams of water getting into my structure every single day, yeah, because of the air moving in there.

It’s a small Gap, it’s a one millimeter Gap, that means now the air is moving through slowly in the back of that Gap and then we have condensation, 800 grams of water, that’s more than a normal pint of water, so that’s what you’re drinking in the night, one of those things, you know, purine, in every square meter of your building envelope, not good to throw, our performance goes down by 4.8 times, so that 140 millimeters need to be now 700 millimeters to come to the same performance, what is cheaper, upgrading your thermal insulation from 140 to 700 or putting a little bit of foil on,

I think it’s a no-brainer, um, again where is the position of our air tightness system, it’s really important, we have to stop the hot air getting in getting cold because the hot air is able to transport more moisture soon it cools down relative humidity goes up and then we have condensation so we need to stop it on the hot side, cool tempered climate or as well Sydney or Melbourne it’s normally on the inside of your building, yeah, so it’s the external wall on the inside in a hot climate it’s sweeping it around so if you go diving then it would be on the other side, um, that’s just a little bit of moisture risks now.

Timber and air tightness, airtight but careful with cracks so Timber itself is airtight we can use timber for our airtight in the system, rough Timber difficult to join spray or spray on may work so if you use spray on, uh, air tightness membranes,

They could work as well if it cracks a little bit that membranes are staying flexible normally so that could work or you put a lot of primer on and then you tape it, uh, dressed or like a planed Timber is okay, uh, retrofitted all Timbers usually don’t crack any longer they have done all their cracking if the timber looks like this you can be sure that stays like it is then um, it’s actually as well pretty safe to use that for your air tightness make sure that the joint is good summer bridging uh what is causing thermal Bridges.

There’s three causes of thermal Bridges change of Direction, Change of material or change of stiffness even this change of sickness is well, uh, change of material change of Direction, um, but we wanted to show that as well because it came up some multiple times so the cause of a thermal bridge is heavy. Change of Direction. Heavy change of material and every change of thickness of a build up is causing a thermal Bridge. So in other words as well your winter and summer lines in the timber yeah the window a winter wood in the Summer Wood that’s already a thermal Bridge.

Theoretically obviously it’s not relevant because it’s so small similar to Staples uh we don’t uh don’t mind Staples in our Timber. As well so such a small impact that we don’t allow for it how to make the decision if it’s a slower bridge that we need to address or we don’t need to address. That’s what we’re recovering in our designer course uh then we have two types of thermal Bridges.

We have Point thermal ridges that could be like a balcony, uh, fixing when we’re fixing a balcony to a structure and then linear uh linear thermal Bridges when you are just letting your concrete slab run through external wall. Then this is our typical thermal bridge. Now the ammunition I want to show you for steel framing yeah if, uh, like metal frame to a timber frame don’t go down the metal frame route.

It’s only asking for trouble if you use an insulated thermal grid like insulated metal frame. The performance reduction is 58 so the therm insulation I put in there gets only a performance of 42 percent yeah and that’s because the model is metal is such a good conductor of heat that the energy flow through here is, uh, is accounting for pretty much like 48 of the energy going through here.

So an insulated metal frame is not much better than uninsulated metal frame if you put in our external insulation to our metal frame that works no problem, uh, this could be your, your service cavity. Now okay soon you do a combination of insulating the metal frame and having an external insulation on top of it. Then you’re losing to 23 percent of your performance or in other words the 58 of your metal frame is lost so that works as well but obviously you need to use far more thumb insulation to achieve the same performance than if you would use a Timber uh timber frame.

So please stay with timber timber is definitely better than metal framing. Good. Let us move into, uh, build ups um only 10 minutes okay um a passive house is doing creates maintains the internal temperature between 20 and 25 degrees. We have 15 kilowatt hours of energy consumption and 10 per square meter for our system.

We went through that already before the results is a sick build up in a harsh climate a thin build up in a mild climate. I think that’s important position of airtight in the system. I just want to repeat that in a cold climate the air tightness and the vapor tightness is normally internally it’s often one system and then now on the outside we have our weather tightness system.

Adidas and Vapor control should be on the warm side of the thermal insulation in a hot climate on the inside is nothing. Everything is on the outside so airtime is vapor tightness and better tightness could all be one system on the outside. Okay so the thermal envelope uh when we’re coming out from the outside uh that’s just an eyes.

I value that’s a resistance not so important that’s our external finish then we have our weather tightness. Then with our thermal insulation then we have our structural components. Then we have our air tightness and then we have our Vapor tightness and we have our internal finish. This is when we’re having like the external finish and the weather tightness is pretty much the same system.

There’s no ventilated cavity uh so external finish is a part of the thermal envelope. That’s our build up in the case we’re having a thermal envelope. We have an external finish then we have a ventilated cavity then we have our weather tightness same layer of the fence. I call it as well thermal therm insulation, structure component airtightness, paper tightness and your internal finish.

Now your thermal envelope is from weather tightness to internal finish. The ventilated cavity and the external finish are not a part of your of your thermal envelope. Just wanted to point that out um so if you’re having a structure and you you have a ventilated foam board hanging in front of your house that’s pretty much a waste of money and time and resources.

Now a bit about how to read the details that I show you in a second yeah so you could have fixed showing in Orange like fixings are shown in Orange. Sheeting is shown in solids and membranes are shown in dashed in dashed lines whether tightness is always blue.

Airtightness is always green orange is always fixing so that gives a bit an idea when you’re now reading this. These details uh we show a lot of membranes in there but it doesn’t mean you need to use membranes I personally rather use a sheeting like an OSP sheeting for my airtightness system.

Then using a membrane um it’s my personal preference but we show it with membranes because it’s the main thing that is done here in Australia.

Here CLT construction that’s our thermal envelope so if you’re having a temperature from 0 to 45 degrees a 75 millimeter of therm insulation is enough on our CLT construction to achieve. Our temperature so Sydney 75 millimeter with the CO2 structure could be enough if we go to -15 to plus 60 degrees then uh we need 150 millimeters of insulation on top of it and if you’re going to the totally extreme minus 45 degrees up to Plus 90 degrees.

So we have nearly boiling water so we don’t want to live there anyway but it’s theoretical then we need a 300 millimeter of insulation on our on our CLT yeah so that’s only theory for you. In this case we need to make sure that our external uh weather tightness is vapor open. It can’t be something vapor tight so metal sheeting or something external is always a risk in cold climates um then Timber framing.

We’ve Got Fabulous tender wrap this up pretty quick. Thank you pan we’ll have to wrap this up pretty quick do the outro soon just to give you that fair warning. Thank you yeah no worries uh if you’re having now a timber frame we need not 70 millimeters, we need 90 millimeters.

We need a bit more because the CLT was helping us with the thermal performance uh here goes then up again up again and then there’s the point where making the frame wider is not any longer economical then we go back to our structural Integrity.

The 90 millimeter frame plus external insulation cool so let me fly through this now uh roof is exactly the same just a bit thicker because of the sunlight hitting it directly or the sky radiation uh floor structures here as well showing you the detailing for floor structure with the air tightness so our floor sheeting could become the air tighten the system.

I think that’s all clear this is the one I really want to show you so please start to use California Corners so that you designing your Corners like this like below here and not this typical framing like we do it in Australia with that Gap in here because when we put the weather tightness on. This is never getting firmly insulated and then this is empty. Please move away from this detail and move to this detail structural Integrity is given uh get your engineer to sign it off.

This is no problem at all this will save you a lot of troubles in your buildings. So that’s important um that’s now a separating floor level we don’t have the time for it so we let us flow through it this is all covered normally in our courses as well. So we are the passive house provider here in Australia the main provider um if you’re interested in our courses we have now the option as a live course where that’s our premium supported course where you are where you’re with the teacher.

You have 100 certification guarantee and you get twice your money back if you’re not passing your certification uh that’s five thousand dollars the self-paced is a Q and R supported so the teacher is not with you during the modules but during the Q R sessions uh 100 certification guarantee one times money back and that is four thousand and then with the bootcamp you’re on your own.

You have one month’s time to complete it you have a fixed exam date and that’s normally three thousand dollars if you’re interested in that you can now get out your phone and scan this QR code and register your interest as well here maybe make a picture of this uh right now as well uh here wood chip dollar 300 100 that is your discount for 300.

If you’re booking any of the courses it’s only available until the end of this week so uh here that’s your discount you get that’s for the designer course if you scan that you register your interest uh remember wood chip uh dollar 300 you get a 300 discount if you’re booking it until the end of the week um or if you register for your interest you can talk with us and let us know that you uh that you were in this presentation and then we can give you that discount as well.

The same we have for the trading um cool yeah thank you very much for joining us today Daniel really really appreciate it just as a reminder for everyone the timber design award uh award ceremony tickets are on sale the event is only eight percent right in person in Sydney.

First time in two years we’re having it in person so come along it’s gonna be a great evening um we also have a Australian massive full-scale test burn program that we are running.

So if you’re interested in getting involved in that please do let us know um and next in our wood Solutions wood Solutions webinar series is Tuesday between 29th of November of November at 11 AM by Dr Philip Christopher on the seven ways to achieve Seven Stars being meeting between two NTC Energy Efficiency Energy Efficiency profusions for Australian homes which would be if you’re not going for Passive house standard um so that’s going to be any helpful week so thank you very much for that and we’ll see you in the next webinar thank you all ciao [Music] thank you

Watch Us Build a Passive House in New Zealand – Episode 3

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