Green Building Blog

low cost eco-building

Evaluating the success of an eco-house March 4, 2013

Filed under: Building materials,Notes from fieldwork,Photographs — naturalbuild @ 9:43 am

How do we judge how ‘good’ an eco-house is? By its ecological performance, what it feels like to live in it, how long it lasts, how much it cost? All of these are used, some formally in post occupancy evaluation, and others more informally in judging what worked and what hasn’t in new buildings. Post occupancy evaluation seeks the opinion of those who live (or work) in buildings, but too often eco-houses are judged just by their cost versus carbon emission savings, or how robust they are. While I am most interested in the balance between building a structure which is ecological as well as nice to live in, and thus tend to focus on people’s experiences and feelings about their homes, I know that we also need to measure the performance of buildings, especially in how they keep warmth in or not.

Recently I have been using a thermal imager, newly purchased by the Geography Department at the University of Leicester, to explore how much houses lose their heat.

IR000029  IR000076

Thermal image (at night) of a conventional house (to the left) and a straw bale eco-house (to the right)

Comparing a straw bale house (in North Yorkshire) with a more conventional house in similar freezing temperatures it was clear to see the benefits of eco-building in terms of reducing heat loss. The conventional house leaked heat – with its external wall temperature as high as 15.9C, whereas the straw bale house external wall temperature was only -2C. Both houses where heated internally and where between 18 and 20 C inside. Notably the ‘hot spots’ on the image for the conventional house where were the radiators were on the wall – the heat was literally leaking straight out of the walls and windows next to the radiators.

Of course, a thermal image only tells us so much. It cannot judge for us which is the most comfortable house to live in. We can assume that the conventional house leaking heat probably costs more in energy consumption, that it is less ecological, and that the internal temperature is more uneven. Likewise we can assume that the straw bale house has low energy costs, has an even temperature and is more ecological. But what does it feel like to live in? Does it feel warm and cosy? Which would people prefer to live in? All these are qualitative questions about feelings, emotions and expectations and cannot be measured by scientific results alone. We need to continue to develop creative ways in which to judge the success of eco-housing and not rely on measures of energy efficiency alone.

[Jenny Pickerill, March 2013]

 

LILAC, Leeds: Low Impact Living Affordable Community February 5, 2013

Filed under: Britain,Inspiring examples,Photographs — naturalbuild @ 2:36 pm

LILAC is a new co-housing eco-development in urban west Leeds (Bramley), Britain. It is particularly interesting because it is using straw bale, it is accessible (the definition of which I will return to), affordable, grassroots, collective, and (sub)urban. There are 12 flats, 8 houses and a communal house, building work is advancing at a pace and they hope to move in during spring 2013.

overview

View of the site from the road in Bramley, west Leeds

LILAC grew from many years of discussions and a desire for an eco-village type settlement in Leeds. In addition to being ecological it was important for the founders that any development was urban – enabling them to travel easily to work in the city without cars – and that it was affordable – few had the capital to invest in expensive housing. As logical as this may seem, few eco-developments have really achieved this in Britain with most new community builds tending to be in more rural spaces and despite best efforts most required a significant capital investment (or large mortgage).

flat block

Community and communal space

The community and communal aspects of living were also central; notably trying to ensure that delicate balance between providing enough privacy and enabling people to share resources, space and social lives. Hence the co-housing model was adopted whereby people have individual homes (and in this case a small outside space), but share a communal house, larger gardens, play areas, and laundry facilities. Community agreements to manage responsibility and expectations are still being developed but are likely to involve a community contribution expectation of two hours a week (with board members devoting four hours a week). This is actually very low in comparison to other projects I have visited and reflects an approach at LILAC that has carefully considered the workload implications of community living. For example, rather than plant the communal gardens with labour-intensive annals, there are plans to use lots of perennial planting (such as fruit trees) in order to reduce maintenance time and tasks.

Their community house is also much bigger than other examples I have seen, it has a large light meeting area, a nice kitchen, a couple of office spaces, large film showing space, bathroom and shower. Crucially it has been built on the edge of the site so that it is directly accessible from the street and forms a welcoming way into the community. Given its size and location it is likely to become the hub of this new community and it is easy to see the potential for other local groups to use it as a meeting place too.

Building design and function

The buildings are designed by the architects White Design and it is the first residential building to use the Modcell approach. The method involved building wooden frames and packing them full of straw bale. All this is done in a local ‘flying factory’ (a temporary local space where the panels are assembled) and then joined together onsite (a bit like flat pack building). It creates straight block walls and most of the windows are floor to ceiling – giving huge views and a range of light inside.

Modcell have tested this approach and already proved its high ecological credentials, so I have little doubt that the development will achieve its aims of low carbon emissions, low energy bills, low embedded carbon and a long-lasting build. What has yet to be seen is how it will feel to live in the buildings. They could be likened to office buildings; very angular, straight and boxy. It is an interesting aesthetic which is very hard to judge at this stage without occupancy or landscaping, and could be considerably softened by both. Moreover, how furniture, storage and people fit into the space is yet to be seen.

render inside

Rendering the straw bale panel walls and inside an almost completed house with floor to ceiling windows

There is also an interesting disjuncture between what makes a building ecological and what makes it pleasant to live in. For example, in the communal house, there is an office on the north side of the building. Because it is on the north side there are very few windows, in fact most are up high and thus difficult to look out from. When I visited with some residents they immediately worried that the room was going to be too dark. But if they added in windows it would change the ecological performance of the building. So is the office missing a window or is the office in the wrong part of the building?

As with all new builds some parts of the design are really inspiring. They have used the hall space in the apartment buildings for spare rooms. It is a really interesting idea. It is a tiny space, just enough for a double bed, but it is private and cosy and is clearly going to be really useful. At the same time, I wonder how other, really small things, might work. There are some interesting problematic locations of window latches. In the upstairs bedrooms (whole, floor to ceiling length windows), two sections open, but I would struggle to reach the top one, despite being tall (5ft 10 inches). In the bathrooms there is a row of windows right at the top of the wall – I could not reach the latches. Not only will this make it inconvenient to use, but will probably reduce people’s use of them and reduce the airing of the building, which in turn could lead to mould issues. However, I am sure there is a simple solution and it is perhaps no more problematic than when I installed ceiling windows that only opened using a turning mechanism – impossible to do from a 10ft distance! In other words, it is always so easy to come in and critique someone else’s building.

Accessibility

LILAC have thought quite a lot about accessibility in all its forms – encouraging a diverse range of residents, ensuring disabled access, designing in affordability, choosing a suburban location (and inviting local residents to engage with eco-housing), and thinking about how the community will run on a very practical level. It is really nice to see a project where there are clearly many different people of all ages going to be living there. The houses and flats are all different sizes, catering for single occupants with one bedroom flats up to families with four bedrooms.

construction

First foor of houses being built

Disability has also been planned for. All the doors are disabled access and will have flush and smooth entrances (low thresholds). Thus all ground floor flats have disabled access. The community house has a lift, which means that they can access all areas, including a shower and bathroom area. However, there is no lift in the apartment blocks, so there is no disabled access to the spare rooms or higher flats. This might all seem logical and certainly many new developments employ the standards of Lifetime Homes to ensure accessibility, but all too often eco-developments abandon accessible designs due to cost and many eco-developments remain the preserve of the young and able-bodied, with little consideration for how people will remain in their homes as they age.

Affordability has also always been central to the plans for LILAC and they have achieved this by developing a model whereby regardless of which size accommodation you live in you pay 35% of your net income for your home. This is paid as a form of rent, but actually residents are slowly buying their home through share purchase (or equity stakes). Once they have bought it their payments reduce and the money is used for communal good. In an era of high house prices, rising rents and falling incomes, this ratio of accommodation costs seems particularly appealing. It has taken LILAC considerable work to develop this system and ensure that it is financially robust and allows for residents to leave and join the community. It still requires a deposit and still enables those with more money to afford bigger properties, but it is one of the few eco-developments to take the issue of affordability seriously, further details are available at: http://www.lilac.coop/concept/affordable.html.

LILAC has yet to be completed but has already generated significant media and political interest. It is certainly a ground-breaking project and they are hopeful that others will be inspired and adopt some of the approaches (such as the affordability model) that they have developed. They are also conducting post occupancy research and have already run workshops to share what they have learnt with others. I have no doubt that LILAC will become not just a great place to live, but a role model for community eco-building for years to come.

For more information about LILAC see their great website: http://www.lilac.coop/, also Paul Chatterton, one of the founders of the project, has recently published an academic journal article on LILAC; Chatterton, P (2013) Towards an agenda for post-carbon cities: Lessons from LILAC, the UK’s first ecological, affordable, cohousing community. International Journal for Urban and Regional Research . ISSN 0309-1317.

[Written by Jenny Pickerill (February 2013) using information based on a site visit in November 2012 and informal discussions with founders of LILAC]

 

Building a Green Economy – Experiences from Germany Sought. Nachhaltinger Bauens in Deutschland – ein Übergang zu einer nachhaltigen Lebensweise? December 17, 2012

Filed under: Building and environmental campaigns,Germany,Politics of building — naturalbuild @ 2:14 pm

[This is a short request for contacts in Germany from a fellow researcher, please contact Kirstie directly ...]

Germany is frequently cited as being a world leader in green building (along with parts of Scandinavia), often inspiring action in other parts of the world.  To understand why Germany has developed green or more sustainable building practices in advance of other countries, I will visit Germany in February 2013 to investigate this issue through research interviews with green building businesses and policy makers involved in encouraging green building.  I am particularly interested in whether green building practices are being incorporated by the mainstream construction industry.  This research follows on from an extensive study that I have been involved with in the UK, examining green building businesses, many of whom referred to German products or practices which had inspired them.

Green building is an important component of a low carbon economy, and a critical element in helping to meet climate change targets in the UK. By using Germany as a case study I intend to explore how and why Germany’s green building sector is more advanced than in the UK, and to identify how the UK could benefit from Germany’s experience.

If you have suggestions of businesses which it would be useful to contact as part of my research, then I would really like to hear from you.

Kirstie O’Neill

Research Associate

Department of geography, Environment and Earth Sciences

University of Hull

k.oneill@hull.ac.uk

01482 465922

 

Best books on eco-housing August 29, 2012

The Birth of an EcovillageZero-carbon Homes: A Road MapGreen Architecture: The Art of Architecture in the Age of Ecology (Architecture & Design)Local Sustainable Homes: How to Make Them Happen in Your Community

Having just spent the last two months reading about eco-housing I have compiled a list of what I consider to be the best books about housing, home and eco-housing. These books encompass a broad interest in the physical architectural design of an eco-house, alongside the important social elements of how people live together and communities function.

 

Follow a journey through worldwide eco-projects August 23, 2012

Filed under: Inspiring examples,Photographs — naturalbuild @ 10:11 am

I have just come across a great site (IM)PERMANACE: global solutions for perninial living, which is documenting a families trip around the world visiting and teaching permaculture projects. Some of the places they are visiting overlap with places I have posted here, but there are so many more as well.

Their “Mission is to travel 40 000 miles overland through 40 countries, creating a free online documentary series about all aspects of truly abundant, healthy and integrative ways of living, farming and meeting our needs locally to share with you and the world in this time of great transition! (IM)PERMANENCE is a co- created film project realising open source learning resources for the world- from the people to the people!”

Their site is packed full of amazing commentary and photographs. I recommend a visit.

 

The Triangle Housing Project, Swindon, UK June 28, 2012

Filed under: Britain,Inspiring examples — naturalbuild @ 3:20 pm

The Triangle Housing Project (Swindon UK) was designed by Glenn Howells Architects  and was the vision of Kevin McCloud of Grand Designs fame. His aim was to build beautiful, contemporary, affordable, sustainable homes and still make money. He wanted to put into practice his ideology that housing should be a combination of Happiness, Architecture and Beauty (HAB Housing). In order to make it affordable McCloud worked with a housing Association (GreenSquare) who intended to sell some properties and retain others for rental.

 

The Triangle is a 42-home development with a variety of properties from one bedroom to four bedrooms. Completed 2011 its progress and ambitions were documented for ‘Kevin’s Grand Design TV series’ on Channel 4 (in the UK). In other words, this was a developer-led project aiming to incorporate many approaches already tested in more radical self-built housing, but rarely in large-scale British developments.

The project tried to do many things differently to a standard British housing development: it tried to make well-built eco-houses affordable; implemented novel design features to ‘mass’ housing (ventilation chimneys); used new materials (hempcrete); made the houses very small and open plan; and built large communal space. The hempcrete was grown locally and used for the external walls, and rooms were given higher ceilings to enable more light to flood small rooms and make then feel bigger. Individual gardens were small but a large communal garden was put into community trust ownership and people encouraged to grow food collectively. Overall, 50% of land is for sharing. Overall, the aim of this development was to build low-impact, low-carbon, and high-value houses.

Did it work? Maybe it is still too early to tell but the results are a bit mixed so far. This is not to say there is still not a great deal of inspiration to be taken from this project and its novelties were always bound to attract the critics. It is definitely a test case. On the one hand the design has certainly won lots of awards. On the other hand plans to sell the properties had to be put on hold because they would not have been able to sell them at a price low enough to have been considered affordable, in other words, they ultimately cost more than Kevin McCloud had hoped. According to reports so far many residents (all rental) really like it. However, some were mistakes were made. In the TV series following the development it became obvious that no one from the design team had thought to consult potential residents on what they needed or wanted. One new resident said to McCloud that he ‘had needed a woman’s perspective’ to point out that they had failed to design in any space for storage, which with lots of children was proving problematic. Neighbours were also not convinced by the higher-than-average height of the new houses which consequently towered over their existing homes.

The main problem appears to be the lack of quality building work. In a recent BBC Online article ‘Defects at Grand Designs presenter Kevin McCloud’s homes‘, residents complained of water leaks, cracked walls and ceilings, and broken rainwater harvesters. The architects are putting the blame squarely at the door of the builders describing their work as ‘bad building. There are hardly any design issues there, it’s to do with the quality of the building works’. That said McCloud himself had been shocked at the low budget allocated for each kitchen. At just £900 per kitchen he had worried that the kitchens had looked and felt too cheap. As to whether these are teething problems that all buildings go through, or a more fundamental problem is not yet clear. However, the situation does highlight the expectation and, I would argue, the need for eco-houses especially to be well constructed. Without good seals and well-fit windows, for example, the design features of houses such as this are easily undermined.

For more information about the development there is an interesting review in  The Architects Journal about Triangle, and a brochure about the project.

[June 2012]

 

Volunteers needed for green build project in Mozambique June 12, 2012

Filed under: Inspiring examples — naturalbuild @ 11:59 am

small environmental education and marine research association in Zavora, southern Mozambique are seeking to build a new centre using eco-friendly techniques with limited financial resources. They are going to use earth bricks, glass bottles and cocconut wood. They are looking for volunteers, peferably with some experience or expertise in eco-building, to help them complete the project. They are looking for volunteers to spend at least a month between now and November later this year. Please pass onto other lists or sites as appropriate.

[Click the image for a larger view]

Background information about the project

Volunteer application form

[12th June 2012]

 

 
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