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According to Sidonie Carpenter, president of Green Roofs Australia, the owners of two outstanding green roofed buildings in Toronto Canada claim they enjoy a 15% premium on their rents and a 15 year waiting list for tenants. Green Roofs Australia holds its national conference in Adelaide next week. Also Alfonso Ponce Alvarez was one of the speakers at the World Green Building Council Congress in Singapore last on his work with the United Nations to develop a common carbon metric and on green building drivers in Europe. The Fifth Estate reports.
For more information on the Green Roofs Australia Conference in Adelaide go to: http://www.icebergevents.com/greenroofsconference2010/
Following is an edited transcript of the interview by Tina Perinotto in The Fifth Estate:
According to Sidonie Carpenter, president of Green Roofs Australia, the owners of two outstanding green roofed buildings in Toronto Canada claim they enjoy a 15 per cent premium on their rents and a 15 year waiting list for tenants.
A look at the websites of these two, www.401richmond.net and www.robertsonbuilding.com makes the claims seems plausible. Certainly Carpenter believes the financial case for green roofs stacks up in more ways than one.
First there is the looming carbon price and the opportunity for “some carbon payback and sequestration opportunities and we start putting a dollar value on that,” Carpenter says.
Next is the very little understood information that a green roof, instead of taking up space where the solar panels might go, will actually enhance the efficiency of photo voltaic panels – by a fairly sizeable margin, in fact.
According to Carpenter when it’s too hot on the roof you get “brown outs” and the solar energy system won’t produce anywhere near as much energy as promised because the system can’t cope with the heat. It works best at between 23-25 degrees Celsius.
“Solar panels work more efficiently over a green roof. You get 25 per cent more efficiency because it reduces the ambient temperature,” she says.
“Even in Hobart it would be over 25 degrees Celsius in summer so you get brown outs.
“In Brisbane even in winter the temperature rises to up to the 30s and on a high rise building in summertime the temperature gets to 70-90 degrees.
“Which is why countries like Germany are leading in photo voltaics. They don’t actually work in very high temperatures on the roof. You’re better off putting them on the ground.”
Carpenter says there is now a lot of research coming out of Germany that combines photo voltaics and green roof analysis because of the benefit of evaporative transpiration, [which is like the cool moist atmosphere that a rainforest creates.]
Green roofs can also help reduce the load on airconditioning of having to cool air of 70 degrees so it can be used inside a building.
So how much do green roofs cost?
To Carpenter that’s a bit like the piece-of-string question. It depends totally on what sort of green roof you want – and that’s anything from a lightweight solution to a full deep-soil garden that requires special structural support. But generally most jobs range between $60 a square metres to $100 a square metre.
There are times, of course, when the project is simply uneconomic. As in her own house, for instance, a “small domestic house, where the quote for the structural steel alone came in at $75,000.”
Did she go ahead?
“No, we did not go ahead with it. It would have meant no bathroom, no kitchen. So we just did a light weight retrofit on the existing roof.”
Another job currently underway at Balmoral in Brisbane may also not see the light of day, because of cost blowout, thanks to a steep site that is difficult to access and requires soil and all other elements to be craned in.
In this case the costs look like blowing out to $2000 a square metre for each of the 60-70 square metre roofs over each of the five dwellings,” Carpenter says. “And the budget is $200,000.”
A green wall, by the way, generally costs between $1200 to $2000. [This might seem pricey but at a recent conference that she spoke at - the 3rd International Urban Design Conference in Canberra - Carpenter expressed mild exasperation that while the cost of structures and maintenance in other parts of a building structure are rarely questioned, the costs and needs for the same in a green roof or green wall were so often viewed as onerous.]
Carpenter says the most expensive green roof in Australia is probably the one over the Victorian desalination plant at Wonthaggi, recently announced in a tender awarded to Fyto Green, at a cost of $4.3 million.
The biggest is undoubtedly over M Central in Sydney’s inner west at Pyrmont, she says.
In the US the Ford motor plant has a 24 acre (9.72 ha) green roof but elsewhere around the globe there are the beginnings of radical experiments – with high-rise farms in Harlem in New York and paddy fields in China.
Carpenter says that there is also great opportunity for large industrial sheds to lower their carbon footprint, especially when so many are occupied by high profile corporates such as Coles and Woolworths under the spotlight for their high energy use.
“I think that’s where there is opportunity, for companies such as Coles and Woolworths, shipping their goods all over; their food miles are huge, and their carbon foot print is huge.
“They could start to cover their industrial buildings with very lightweight green roofs that produce carbon sequestration. We’d be looking at very shallow soil profiles – they are the ones that would really make a difference -especially with those large industrial estates, where there isn’t a blade of grass to cool the ambient temperature.”
And most, adds Carpenter, could be done for around $100 a sq m.
By Tina Perinotto
14 October 2010 – Alfonso Ponce Alvarez was one of the speakers at the World Green Building Council Congress in Singapore in September. He spoke with The Fifth Estate on his work with the United Nations to develop a common carbon metric and on green building drivers in Europe.
Following is an edited transcript of the interview.
The Fifth Estate: Please tell us what your work is about
Alfonso Ponce Alvarez: I work for the French Building Research Centre, under the authority of the huge Ministry for Sustainable Development in France, which is the result of a merger between the Ministry for Construction, Transportation and Urban Affairs, the Ministry of Environment, and the Ministry of Social Affairs. So my organisation is placed under the authority of this ministry. So we are 900 engineers, five different locations in France, one in China.
We do fundamental research on buildings and infrastructures, and we get money from the French Government for that. We do certification of building products, and we run the French National Scheme for Green Buildings, which is called HQE and stands for High Environmental Quality. It’s a government-owned scheme. This is very peculiar.
TFE: What’s peculiar about it?
APA: It is completely public. It’s public sector driven. It’s not driven by industry. We do also testing; we do publications and we help the French Government in drafting all the regulation for buildings in France. And we are heavily involved in European standardisation too. I’m also a board member of UNEP-SBCI (.The United Nations Environment Programme Sustainable Building & Construction Initiative
TFE: What is happening with green buildings in France and Europe? And what are the drivers?
APA: In Europe we have the European Commission, and we have what we call directives. So the European Commission issues directives that all member states have to comply with. But you are free to determine the path you will follow. You need to get to the point A, but you are free to choose how you get there. So there is no harmonised reality in Europe; every country is at a different stage.
I can tell you what’s happening in France. In France we have this regulation called Grenelle de l’Environnement. Basically, the commitment is all new buildings will consume 50 kilowatt hours per square metre per annum by 2012.
TFE: And what do they produce now?
APA: Today we are more or less about 120 [kwh] in new buildings. So the first piece of the regulation is 50 kilowatt hours per square metre per annum by 2012. Positive buildings by 2020.
TFE: What do they mean by positive buildings?
APA: Net zero energy. So they produce more energy than they use. In Europe we call that positive buildings. And in America they call that net zero energy buildings. The idea is they produce more energy than they consume by 2020. This is the French Government, but it’s in line with a directive called 20-20-20 Directive or Energy Package, and that’s a European regulatory framework that says that by 2020 we will reduce by 20 per cent global emissions of carbon in the European Union, and we will use 20 per cent of renewable energy to get that goal.
TFE: On the base of 1990?
APA: On the base of 1990, exactly.
TFE: With this directive, how does that compare with existing buildings?
APA: Well, regulations in Europe are very stringent, more than in the US, because we didn’t have the same attitude towards the petroleum shocks of the ’80s and ’73. So energy efficiency policies have been in place for a long time in Europe. So regulations are quite high already.
TFE: How do European buildings compare with American buildings then?
APA: There is this British report from BRE which shows how a LEED-rated building will perform in the US and in Europe against a BREEAM and…Green Star. They’re basically comparing how a LEED Gold building would perform in Europe against a BREEAM outstanding building in Europe. The result is that you get a higher certification on the LEED in Europe, so you have several buildings that are certified in Europe with LEED, even if they are just complying with the regulation. But that’s normal. It’s because LEED is referring to American standards and different targets and different calculation methodologies, and the standards in the US tend to be lower because of the way you build a building. You use more wood, you know, it’s different, it’s a different reality.
TFE: So a Platinum LEED might equate to what in France?
APA: It’s not that – what we say is – for example, energy; energy will be calculated in this manner: kilowatt hours per square metre per annum. And we will all measure that in the same way. And the same applies for indoor air quality.
TFE: Okay, so it’s not that the actual ratings will harmonise, it’s the actual methodology will be the same, for water, energy, for anything?
APA: Exactly. So the metrics that we will be using will be the same.
TFE: Is there a move to make it the same rating systems so everyone understands what a Five Star is?
APA: Well, that’s more of a political movement. Not today.
TFE: How does it help the fund manager, though? Because the fund manager wants to know that his or her portfolio of buildings in four different countries with four different rating system, is the same standard. Does this really help them?
APA: Yeah, it does. It does, because what this guy wants is to actually establish baselines, benchmark his portfolio, the performance of his portfolio with his competitors, and monetarised indicators.
TFE: So he’ll know that a level three on one scale is the same as a level four somewhere else?
APA: Exactly.
TFE: But the market doesn’t understand that?
APA: The market might not understand. It’s a first step, it’s a first step.
TFE: Okay, first step, you’re not going to stop there?
APA: No. It’s a technical step so that this guy will know, will be able to compare the energy performance of his portfolio, even if he has buildings in France, Germany and the UK, because for energy he will know that we are using the same metric.
TFE: How are you organising that?
APA: We decided to partner with the Working Building Council and UNEP-SBCI – United Nations Environment Program – Sustainable Building and Climate Change Initiative. So these people basically took one of the metrics we defined, the carbon metric - the way we calculate the carbon emissions from buildings. We worked with them, so we worked the metric a little bit, and they endorsed that metric. And that metric was presented by UNEP’s spokesman, Nick Nuttall at the latest COP, COP 15 in Denmark, in Copenhagen. What we’re planning to do now is to extend that collaboration to other metrics. So we have to find six metrics and we’ll want to extend that cooperation to the rest of the metrics that we have to find.
TFE: Can you tell us more about the European and French situation with green buildings?.
APA: Well, you know, France is in a very funny spot, because the involvement of the French Government is huge because of the French traditions. So for example, the HQE rating system is mandatory in several parts of the country, in what we call… business districts, for example. So if you want to build a skyscraper, for example, in Paris, in La Défense, you have to comply to the HQE scheme. It’s mandatory. It’s the High Environmental Quality. It’s the equivalent of Green Star. Insurance companies are giving premiums if you use it where it’s not mandatory.
TFE: Why is this?
APA: Because from their perspective it presents a risk-reduction factor. It anticipates regulation, so it’s a way for them to reduce their risk exposure. So they give premiums. You get also an acceleration of your working premium or tax rebates if you use it. So these are the things that the government …it’s highly, highly incentivised.
TFE: What other incentives are there?
APA: The public policies include tax rebates, and the acceleration of the working permits, so you get your working permit more quickly.
TFE: To start development?
APA: Yes.
TFE: And what about the tenants, the premium tenants, do they want it?
APA: Yes, landlords because of [the incentive] and tenants because…they would like to display the results.
TFE: What about existing stock?
APA: I am not really familiar with existing stock. What I know from existing stock is the problem we have with existing stock is we don’t really know if certification is the right tool to incentivise this sector. I mean, certification as a third party verified system. It’s probably more a simple assessment that we need, and what we need is to collect that data from the stock. So physical, functional data, but also financial data. And put that into a database. But the problem is, who owns that database? How can you make sure that the data is confidential
In all the European territory, you have a directive called the Etiquette- the European Etiquette for Energy, and you have the DPCs…so this is basically that you have to disclose the energy..for all buildings when you sell it and when you rent. And that’s mandatory.
TFE: There’s no minimum performance, or saying you have to improve it?
APA: No. This Energy Etiquette is not really having an impact in the marketplace actually.
The reality in the European Union [on energy] is so diverse. For example, a country like France, people don’t really care about carbon because 85 per cent of our energy comes from nuclear power. So it’s carbon neutral.
TFE: So why are they making restrictions for new buildings, then?
APA: To be in line with European directives. But carbon is not an issue in France. Water is an issue in Spain, but it’s not an issue in Finland. It’s very… very …like that.
TFE: So what are the big drivers then in France? Just the European directives, then?
APA: The big drivers in France are, yes, the directives [which are market drivers] just for a segment, the leaders, the 20 per cent more advanced. And that’s pretty much it.
TFE: Alfonso, thank you for that.
The Fifth Estate travelled to Singapore to cover the World Green Building Council Congress, as a guest of the Green Building Council of Australia
Source: http://www.thefifthestate.com.au
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