Linking you up with some green building and energy stories: What could today's passive house designers learn from George Bernard Shaw's rotating hut? Treehugger
Future housing supply in Ireland — for some interesting commentary from the Ireland After Nama blog about the Construction Industry Federation's call for new house building, see here and here.
As the election approaches, where are the parties' policies on housing and planning? Ireland After Nama
The Canadian ancestry of the passive house Treehugger
Profile of a passive house in Wisconsin Metro Hippie
Modern Rwandan education centre made with local materials Inhabitat
A blower door test being conducted at Jer Rynhart's super air-tight Wicklow home — the house has an air changes per hour rate of 0.11
By Gavin O Se, NSAI certified airtightness tester, certified passive house designer and BER assessor with Greenbuild
Recent issues of Construct Ireland have featured houses that have been to the very best international standards of airtightness: eg Jer Rynhart's house in Wicklow and Tim O'Donovan's house in Cork, both of which had just a fraction of an airchange under standardised test conditions.
At the same time as these super-airtight houses are being built, the latest draft Part L of the Building Regulations is proposing to lower the air permeability rate for new dwellings from its present level of 10 m3/(hr.m2) to 7 m3/(hr.m2).
I was quite disappointed ― though unsurprised ― to learn of the new maximum airtightness level. It set in process a train of thoughts, the result of which is this article, in which I will look at:
• Where are we in terms of airtightness and airtightness testing?
• Where are we going?
• Where do we stand internationally?
Builder Dan Phillips tells a TED conference conference in Houston about the unique houses he's built with salvaged and reclaimed materials. This is funny and fascinating.
Managing and Resolving Unfinished Housing Estates is a consultation manual published by the Department of Environment late last year. It identifies unfinished housing estates and outlines the health and safety issues surrounding these unfinished developments.
The report says that the over-supply in key metropolitan areas is not extensive and should improve in the short to medium-term. However, part completed or part occupied developments in areas with a weaker housing market may prove problematic.
The main proposals outlined are to complete unfinished housing estates identified by the National Housing Development Survey, ensure compliance with health and safety legislation and identify the roles and responsibilities of key stakeholders.
The report proposes that a team from each local authority maintain an up to date register of housing developments. This is a positive step, but the key responsibilities of the team should be widened to include the environmental assessment of housing developments.
While it is a positive step by the department to ensure the health and safety of unfinished housing developments, it is important to consider the long-term sustainability and environmental impact of finishing these estates. The report’s main aim is the “delivery of sustainable communities...and sustainable development...”, however there is no definition of sustainability. The three pillars of sustainability — the environment, the society and the economy — should be outlined and used as a basis to evaluate unfinished housing estates. The environmental impact of unfinished housing developments should be considered in terms of promoting sustainable living. A review of demand for housing, the existence of adequate local public transport and the availability of jobs and amenities within a locality are key to sustainable living. No alternative solutions are proposed for sites in areas with a weaker housing market.
The site resolution plan for problematic developments in areas with a weaker housing market should be extended to include the wider environmental impact of completing these developments. For problematic sites the focus should be promoting sustainable solutions. Although the environmental cost of demolishing a development may prove high in the short-term, the long-term environmental cost of completing developments in areas with low housing demand, poor local employment and poor public transport outweighs the short-term cost. This analysis should be included in the forward planning section of the report to promote sustainable low energy communities.
The report’s proposals are based on the National Housing Development Survey (2010). This survey was crucial to identifying unfinished housing estates. However, the report should extend this survey to include technical surveys of all unfinished estates. These surveys should include a review of services, access, safety, structural defects and a review of the quality of the housing stock with a focus on energy and carbon. This survey should focus on developments in areas with a weaker housing market to determine the value and viability of completing them.
Based on the extended survey a cost-benefit analysis should be carried out. This analysis should be used to evaluate the cost of completion — including upgrading the dwellings to a low energy standard — versus demolition of these developments. The analysis should include provision of adequate local public transport, the provision of amenities and the existence of a local job industry. Demolition of sites should be carried out where sites do not satisfy this analysis.
The report is a positive step to ensuring the health and safety compliance of occupied and part occupied unfinished housing developments. However, it would be enhanced if it examined the environmental impact of these developments. The report would also benefit from a detailed cost-benefit analysis which should include the economic, social and environmental costs of completing developments with particular focus on areas with weak housing demand.
Sadhbh Ni Hogain is a structural engineer working at EOS Future Design. She recently completed a MSc in advanced environmental and energy studies from the Centre For Alternative Technology, Wales.
William McDonough is arguably the world's most famous green architect and is the father of cradle to cradle design. Here he is describing one of his planned eco-cities in China. Keep watching until the end, it gets good. This is taken from McDonough's Ted talk. There's a longer version of it here.
Happy new year to all Construct Ireland readers. We're getting right back into the swing of things here with a new issue due out before the end of the month. Here's a few interesting stories you might have missed over the holidays.
Six green building trends to watch for 2011 Jetson Green
Ten more (slightly US-centric) trends for 2011, also from Jetson Green
This is the last in a series of blog posts by the architect Mark Stephens on going off grid. The full series can be found here.
A flooded percolation area is a serious health hazard
Welcome to this final blog post on living off gird, which focuses on the safe disposal of any wastewater from a house not connected to a public sewer.
This topic is probably the one that Ireland has the most experience with (both good and bad), due to the lack of sewerage infrastructure once you leave the main towns and cities. There are currently around 500,000 on-site wastewater treatment systems in Ireland, and many are believed to be contributing to groundwater pollution due to poor design, maintenance and lack of regulation over the years. The EU recently ruled against Ireland for this, and the mandatory inspection of such systems is expected to start within the next year.
This is also the one topic that will cause the most problems if you are looking for planning permission on a new house or more particularly the renovation of a ruin or abandoned house.
So let’s have a little look at the history of effluent disposal in modern times.
Septic tanks
The traditional septic tank would have been a concrete single chamber system — the outlet would have simply been piped out into a ditch that drained into the next field.
One problem arising with these systems is that frequently the farmer working the field would fill in the ditch, causing the effluent to start backing up. Then you could find yourself standing in a field slowly submerging in crap (this has happened to me on numerous occasions). A system like this also provides little treatment of effluent.
An article by Lenny Antonelli in issue twelve, volume four of Construct Ireland discusses precisely this problem and the bacterial hazards that are created.
The next stage on from a single-chamber septic tank was the dual chamber (again constructed in concrete). This system allows the solids to settle, with the second chamber taking the overflow which then exits the tank in a similar way. The same problem described above will also occur if the overflow effluent isn’t treated correctly. It’s therefore essential that a proper percolation or polishing filter system is designed and constructed within the curtilage of your own site.
Proprietary effluent treatment systems
A proprietary effluent treatment system utilises some form of aeration or mechanical purification/digestion before the wastewater exits the system. If properly designed for your site conditions, these systems can treat the effluent to a high standard, but consideration must still be given to what happens to wastewater when it enters the field. Most of these systems will require an electricity supply, which will add to your energy usage (and some may say goes against the off-grid ethos). One advantage of such systems is that it is possible to test and verify the quality of the effluent as most of the treatment is done in the unit itself, whereas with septic tanks more of the treatment takes places in the soil itself, making testing of final effluent difficult for these systems.
Composting toilets, reed bed systems etc
The principle of the composting toilet is straightforward — the solid waste goes into a separate section to the liquids, and the solids then dry and become first-class manure for the land. To create this compost requires a bit of time away from human contact which thereby breaks the cycle of the pathogens. Another option is rapid hot composting where usually sawdust or straw is added in order to kill all the known pathogens to humans in hours. But it will typically take about six months for compost to be available in dry conditions, longer if it is outdoors in a damp location.
Another popular way of percolating any waste in the ground is via a reed bed system, which is a natural solution that works ideally on a site with a fall where any effluent trickling through the reed bed is cleaned by micro-organisms living on the root system. Micro-organisms here break down the sewage in the presence of oxygen (ie aerobically). Your site will need to be physically suitable for a reed bed, and you may have difficulty convincing the planners that your system will work.
Planning
Any new effluent treatment system, either for a new house or a renovation will require planning permission. It is often thought that because a house was previously on the site (say for example, a wreck with no septic tank) you will have a better chance of obtaining planning permission. But I have seen many a dream quashed when planning is refused because the ground on site wasn’t suitable. The rules may be relaxed a little if the house already has a septic tank - a proposed upgrade may be acceptable if it improves treatment even if it doesn’t exactly meet the Environmental Protection Agency's Code of Practice. But you will find it harder to convince planners about any new system that falls outside the remit of the EPA Code of Practice.
If you're looking to install a new effluent treatment system for your new build or renovation project, start by contacting an experienced engineer or similar professional who can advise on the most appropriate system design for your site.
So that’s it, my take and discussion for living off-grid. With the country currently in economic turmoil, maybe living a simpler life not connected to electricity, water, sewerage etc doesn’t seem too mad cap after all.
Special thanks again to Nick Rosen's book How to Live Off-Grid. Mark Stephens ARB RIBA MRIAI is a UK and Ireland registered and chartered architect specialising in sustainable, unique designs.
We're getting down to the real work on the January issue of the mag now. Expect to see case study articles on the renovated architectural landmark that is the former Carroll's cigarette factory in Dundalk, and on a couple of excellent passive houses. We'll also have features on the state of the economy, and on whether it makes more sense to use electrical-based heating devices as our power supply is gradually decarbonised. For now, here's some stories that might be of interest.
Ireland helping to break logjam in climate talks Irish Times
Ireland's negotiations with the ECB and the IMF are perhaps the most important talks that this country has engaged in since Michael Collins and Arthur Griffith negotiated the Anglo-Irish Treaty with the British Prime Minister, Lloyd George, in late 1921. This time, the Irish team is led by the governor of the Central Bank, Patrick Honohan, the financial regulator, Matthew Elderfield, and the head of the National Treasury Management Agency, John Corrigan. Unless these three men insist that the following four truths are accepted by those on the other side of the table, the country will be presented with an agreement that will blight its future for at least a generation.
Truth 1. If Ireland has to pay interest on the loans being negotiated at a rate which exceeds the rate at which the economy grows over the next few years, it will make the country's situation worse, not better.
Let's look at the figures. The Greek rescue plan involved loans at 5%. If the same rate is offered to Ireland and the Irish economy shrinks by an average of only 2% a year for the next four years as a result of the tax increases and spending cuts to be introduced under the government's deficit-reduction programme, the real interest rate would be 7%. This is simply not affordable. This is not just because of the interest the country will have to pay on the new debt facility but also because it will have to pay the same rate on the €72 bn of foreign debts the state owes already and on the overseas borrowings of the banks which the state has guaranteed.
The banks' loans are put at €34bn from German banks, €31bn from British banks, €19 bn from US banks, and $16bn from French banks, a total of €100bn. If all the €85bn of additional foreign debt under the ECB/IMF facility is drawn down, the country's overseas debt would be €257bn by the end of the four-year austerity programme. As a result , Ireland's public debt to national income ratio would be over 200%, an entirely unsustainable level for a country without its own currency. The interest burden would be €18bn a year. This amounts to half the total tax revenue that can be expected in 2015 and perhaps the whole of that year's trade surplus. More frighteningly, it would be €10,000 a year for each person in employment.
It could be claimed that the banks will pay some of this interest themselves but it is far more likely that they will still be making losses because of the bad debts caused by the continuing contraction of the economy. The state may even have to inject more capital into them. If the banks can pay the interest on their borrowings in Ireland they will be doing well.
Ireland is therefore totally unable to pay any interest on any new loans unless the rate of interest is no greater than its growth rate. If its growth is negative, the interest rate needs to be negative too. What is therefore needed is not a loan but a bailout – either a grant or a loan with an interest rate based on the economy's future economic performance.
Truth 2. Any grant or loan to Ireland will only buy time for the eurozone to come up with a cure for the whole sick system. Ireland should not be asked to bear more than its proportionate share of the cost of gaining this time which is for the benefit of every euro user.
Without exception, every eurozone country is running a budget deficit bigger than the Stability and Growth Pact allows and only five small countries have debt-GDP ratios below the 60% ceiling. As a result, all are planning budget cuts which, because they are being implemented simultaneously, could make matters worse by reducing national incomes at a time when national debts are still going up. In other words, the whole eurozone system is sick and Ireland and Greece are just bad cases of a disease which everyone shares. A collective cure needs to be found and it makes no sense for Ireland to make sacrifices unless such a cure is being planned. Part of any agreement between Ireland and the ECB/IMF team should therefore be an assurance that the eurozone is going to be transformed. Preventing governments running large budget deficits should not be part of that transformation since such deficits are a symptom that something is wrong rather than the prime cause. States need to be able to act counter-cyclically to protect their economies and, in any case, Ireland's problems are largely due to its banks.
The cost Ireland will bear for helping to stabilise the euro until an overall solution can be introduced is not just a matter of money. In fact, money would be the least part of the cost and it can always be repaid later. The greater part would be social — the poverty, the unemployment and the forced emigration — and the lives blighted as a result can never be fully restored. The transition to the new basis for the eurozone should therefore be quick and Ireland and other troubled countries should be supported by their less-sick partners while it is coming about.
Another element of the cost could be that Ireland will be asked to sell its national investments in companies like the ESB and CIE. This would raise very little money — recent estimates by Siobhan Creaton put their total market value at about €12bn — but would end the possibility of having these companies play a national developmental role. Under private ownership, immediate short-term profits would be the primary goal. The privatisation of Eircom is an awful warning. The company was loaded with debt by a succession of private owners and, as a result, did not have the resources to roll out broadband as quickly as happened in other countries. No-one will ever know how much income the country lost because of this failure.
Truth 3. The ECB bears a large share of the responsibility for the regulatory failure which led to the property bubble.
Since the eurozone was set up, the Irish Central Bank has been the local office of the ECB. The Central Bank knew the extent to which the commercial banks were going in for excessive property-based lending and gave details each month in its publications. These showed that Irish debts were increasing at an excessive rate in relation to the rate of income growth. For example, over at least three years between 2004 and the end of 2006, private sector debts to Irish banks grew at an average rate of just under 30% a year. This meant that the amount households and firms owed more than doubled in that short period. Tbe Central Bank also knew that most of this excessive lending – over 60% of it in some years - was to do with property. Some loans were for mortgages, others to finance construction companies and developers, and some to people who wished to borrow against their real estate assets. It sent all this information back to head office but it is not clear whether the ECB tried to persuade the Financial Regulator and the government of the dangers the country was running. If it did, it was ineffective. The ECB must pay a share of the cost for this failure.
Truth 4. There is a Plan B. Ireland doesn't have to take anything that is offered. It can leave the euro quickly and easily.
If the deal offered by the ECB/IMF negotiators is unsatisfactory, the Irish government can simply announce that, when the banks open the following morning, the accounts in them will be in a new currency – let's call it the harp - and all wages, rents, debts and other payments are to be paid in harp with immediate effect. (Cash payments would have to be made in euro notes and coins until harp ones could be introduced). After the announcement the government would issue itself with the new currency on a debt-free basis so that it no longer needed to borrow to cover its budget deficit. External debts in euros would be negotiated down to an affordable level. The devaluation brought about by the switch would make the country very competitive and any inflation the new money caused would provide the higher incomes needed to pay harp debts and support harp asset values, and thus strengthen the banking system.
The Irish negotiating team must make it very clear to the Commission and the ECB that Ireland would prefer to take this road and undergo an acute but brief crisis rather than accept a deal that entails an indefinite period of national penury with no guarantee that, eventually, its debts can be cleared. It is imperative that the ECB/IMF team understand that unless Ireland is offered a real road out of its present situation within the eurozone, the country will retrieve its national sovereignty and opt out.
Conclusion
Ireland's bank guarantee was a bluff which the government prayed would never be called because it knew that the country would be unable to honour it if it was. Well, now it has. The day it dreaded has come and the government needs to admit that Ireland cannot honour its guarantees without grants towards their cost from its EU partners. Loans will not suffice. Unless it gets this help, Ireland has no alternative but to renege on the guarantees and to build itself a future within the EU but outside the eurozone.
Richard Douthwaite is an economist and writer with a special interest in climate and energy issues and local economic development. His new book is Fleeing Vesuvius.
Here's a few stories that might distract you somewhat from the economic doom that surrounds us. Actually though, if you want to be totally distracted, maybe ignore the first two.
This is the fourth in a series of blog posts by the architect Mark Stephens on going off grid. The full series can be found here.
As we’re approaching the end of my guest blog posts, it’s lucky that the last two topics are probably the easiest for Ireland to handle — this post on how to get water and food, and the final blog post on the safe disposal of effluent. The reason these two are the easiest for Ireland to manage is due to effectively the complete lack of water delivery infrastructure once you get outside the major cities and towns.
Water
Let’s therefore deal with how we get water to our site, using a rural house as an example. The previous articles have dealt with shelter and providing heat and power. As long as you have the means to make a fire and put a cover over your head you can live pretty much anywhere, but it’s essential that you have a source of water in order to survive. The requirement for water divides neatly into two areas: the water to drink and the water to cook and wash with. So let’s look at ways you can obtain water from your site without being connected to a mains water supply. We’ll firstly discuss how you obtain your own source of water.
Wells & Boreholes
A new-traditional type of well is quite expensive to construct; instead a borehole is drilled to obtain water at a much smaller diameter. Normally about 150-300mm in diameter and drilled down to at least 50m, the resulting hole is lined with a steel or plastic tube and has a pump at the surface to pressurise the water into your house.
With so many variables (land, contours, geology etc) it’s difficult to give exact costs without one of the specialist firms that conduct the drilling visiting the site. A very approximate cost is somewhere in the region of €3000 to 6000.
Springs
A spring is water that percolates through porous earth until it reaches an impervious layer on which it collects. If the water bed is U-shaped then water is forced up resulting in a gush or trickle.
Streams and rivers
It is possible to obtain water directly from a stream or river, but there’s no guarantee of its cleanliness (which I will discuss in a moment). However, I have completed a few planning applications for new houses where the water is obtained from a stream.
In order for your water to be drinkable (or 'potable') then it will need to meet European safety standards; it is therefore essential for all of the methods described above to have a sample of your water tested and if required, to fit a purification system to purify the water further. Some councils in fact insist upon this sample water test as part of a planning application.
Let’s not discount one of the biggest sources of water available — rain. If they were careful, two adults and two children could theoretically manage for water solely on collected rainwater. What all of us can do however is implement a rainwater harvesting system, even if it’s only a basic collection system such as a water storage butt which can then be used for greywater in the house (flushing toilets etc) A more sophisticated system (ie a full rainwater harvesting system) could involve large underground storage tanks, physical and ultraviolet filters and delivery pumps / pipes. With water charges rising and metered costs likely to be introduced, some form of rainwater management is essential.
Food
So we have got water into our off-grid house, the next aspect in survival is providing enough food to survive. According to the excellent website A Self Sufficient Life http://www.aselfsufficientlife.com, approximately sixty square meters is enough land to feed a family of four for the year. As someone who’s dabbled in growing his own vegetables, it’s important to point out that a) It’s bloody hard work and b) it takes a lot of time. There is however nothing that replaces the taste of your own veg.
As well as growing vegetables, fruit, herbs etc. it is also possible for you to keep animals for milk and meat. It’s not impossible to keep a single cow or a few pigs, sheep or goats on a small piece of land, but as seen in the incredible upsurge in poultry sales, there are many people now keeping hens for eggs (myself included). A small group of hens (say six to ten) will constantly keep a family in eggs with a few to spare. Don’t forget that ducks and geese can also be kept for eggs and slaughter; interestingly the profitable life of a goose is six times as long as that of a chicken. Also, don’t forget that you could even keep a few hives of bees for honey.
When you have sown your seeds, tended your crops and reaped your vegetables, the key steps are that you should firstly eat seasonal food and then preserve and store food for eating later. There are stacks of books available on salting, drying, smoking, bottling and potting your meat, vegetables and fruit. And if the thought of becoming self-sufficient is turning you off then don’t forget that you could even brew your own wine, beer or cider from apples grown on your land.
The next and concluding article will deal with how to dispose of the effluent that you and your family produces, another area that Ireland has had to become self-sufficient in due to the lack of sewage infrastructure when you venture outside cities and towns. I’ll also be discussing the problems associated with every household pumping out their own effluent into the Irish countryside in poorly designed and constructed septic tanks.
I've just returned from Plan Expo, where we spent two days flogging the new and past issues of Construct Ireland. There was a steady enough crowd over the two days, and I spent most of yesterday morning at the Rebuilding Ireland conference on the second floor of the Convention Centre (here's a pic of the view from up there). I tweeted some of the speeches — you can find all our Twitter coverage here. Tomorrow morning, I'll be covering US energy secretary Dr Steven Chu's appearance in Dublin. Anyway, here's some interesting stories you may or may not have seen:
Ireland's greenhouse gas emissions drop Irish Times
In the UK, landlords to face fines for energy inefficient properties Guardian
Electric Toyota Prius's coming to Ireland Dept of Energy
This is the third in a series of blog posts by the architect Mark Stephens on going off grid. The first post was a general introduction to the series, while the second focused on the building envelope.
Photovoltaic (PV) panels can convert sunlight directly into electricity and are a well established way of generating off-grid power. Photo by Charlie Vinz. The next requirement after we’ve found a suitable place to live off-grid is to provide power; we’ve already introduced the concept of going passive as a way forward in order to have minimal heat demand, but we will still need to provide power to lighting and other electrical appliances.
We can divide our power demand into two areas: 1) power for lighting/electrical items and 2) power for hot water and heating
Power for lighting/electrical items
We therefore need to generate our electricity through a self-contained, renewable method — this leaves us with three options:
Wind
The concept of micro-wind generators is well established to generate electricity; the problem is that to power a serious amount of power requires a pretty big wind turbine. But the thrust of this blog post is being more aware of our electricity consumption — we will be relying less on electrical/electronic gadgets and getting back to a more simpler life where when it gets cold we add another sweater rather than increasing the heating an extra degree. Another problem is that wind turbines are notoriously temperamental over where they are located — they won’t work as effectively in built-up urban areas and even in rural locations they require minimal obstructions that cause fluctuations and disturbances in wind speed.
Water
Again the concept of a water or hydro turbine is well established; obviously they key thing here is that you need to be next to either a fast flowing stream/river or have access to a large drop on a large body of water (head) in order to turn the hydro turbine. You will obviously need to ensure that you have a legal right to use the water.
Solar
Photovoltaic (PV) panels can convert sunlight directly into electricity and are again a well established (if costly) way of generating off-grid power. Continuing the theme of reducing our electricity consumption you can obtain a small solar panel kit that provides 150 Watts of power; the key then is to run low voltage LED lights to provide your lighting. In order to power larger items such as a standard TV that work off 240V you will need an inverter.
With all of these technologies you will come unstuck if a. there’s no wind b. the water runs dry in summer and c. there’s no sun! To get round this problem you will need a bank of batteries to store the electricity you’ve generated. The batteries will need to be quite large and ‘off-gridders’ recommend the use of submarine batteries that can store and release enough electricity for a small home. Some ‘off-gridders’ use the PV panels to charge the standard AA rechargeable batteries that are then used in LED head lamps so that you can move around after sunset without bumping into things.
Power for hot water and heating
The next form of power we will require is to provide heat for cooking, heating and hot water. As discussed, by following passive house principles we will drastically reduce our space heating requirement — a certified passive house will require less than 15 kWh/m2/yr — but we will still require hot water for showers, washing etc. A solar collector (evacuated tube or flat plate collectors for example) can provide a large percentage of your hot water requirements (60-75%), the problem occurs obviously when there is less sun during the winter months and hot water is still required. The unfortunate reality is that something will still have to be burnt in order to fulfil this shortfall. A well installed and efficient wood pellet burning stove can provide hot water and heating but the more obvious example would be a simple wood burning stove with a back boiler that can provide heating to radiators, hot water and a method of cooking food. The only draw-back is that the fire needs to be lit whenever hot water is required. Again, we need a drastic rethinking over how we live our lives and to readjust to not having a source of constant hot water. It is important to note that although wood doesn’t provide as much energy as oil or gas for example when burned (therefore you will need more of it), the CO2 emissions are over 10 x better (0.025Kg CO2 per kWh for wood compared to 0.272 CO2 per kWh for oil). The obvious place therefore to be placed to be self sufficient in wood is next to a sustainable, managed forest as Ben Law did in the Woodsman’s Cottage episode of Grand Designs.
The next guest blog post takes us onto how we become more self sufficient in terms of water and food.
As always, comments welcome.
Mark Stephens RIBA MRIAI is a UK and Ireland trained chartered architect, based in Foxford, County Mayo, Ireland. He specialises in one-off, residential houses, extensions, restorations and refurbishments. His slant is a modernist approach using traditional forms and materials; his work also combines a contemporary architecture with an ecological and sustainable soundness.
This is the second in a series of blog posts by the architect Mark Stephens on taking a traditional Irish cottage off grid. The first post is here.
OK, so here's the first main blog post - where are we going to do it? I'm going to concentrate on an actual built structure rather than the other forms of off-grid living such as yurts, camper vans etc which are discussed in Nick Rosen's excellent book How to Live Off-Grid .
The first form of structure I'll be looking at is the derelict, traditional small cottage which would have been prevalent across the whole of Ireland, though most are now are disintegrating through decay because of exposure to the elements.
There are two stages in making such a structure habitable before we even consider how we then get that dwelling off-grid:
1. Increasing the size. Although we don't want to return to the McMansion sizes of the Celtic Tiger days, we will still need to increase the floor area to make it a more practicable solution for the family of today. Normally the biggest 'traditional cottage' size would have been a single room either side of a communal eating, living/sleeping space. So unless you are a very small family you will need to increase the house by at least another bedroom, and frequently these derelict cottages were without bathrooms, so a new bathroom will also need to be included.
Some older cottages would have been even smaller — I am currently restoring two cottages that were just single rooms where entire families were raised!
I'm not going to discuss here the problems associated with planning for converting properties of this type into habitable dwellings; for more details on this visit my website .
2. Upgrading the buildings fabric to a current standard.
The standard I would suggest trying to achieve is the passive house standard, devised by the Passive House Institute in Germany. Again going into depth on this standard is beyond the scope of this blog post but we can have a look at typical insulation standards that will need to be achieved in order to get close.
The roof should be the most straightforward area as typically the roof will have to be reconstructed anew with new rafters, slates etc. This is generally because the increased weight of slating the roof (frequently the roof would have been metal sheeting that would have replaced thatch) requires the rafters to be increased in size; larger sections of timber would have been impossible to obtain when the house was originally constructed.
This means that we can create a roof with the desired level of insulation. The u-value for a certified passive house is less than 0.15 W/(m2K), which could be achieved with a warm-roof construction with sufficient insulation between the rafters, and then further insulation under them to prevent cold bridging. The amount of insulation needed will vary depending on the type used.
The walls of the cottage will be more problematic. A typical U-value for a 2' stone wall is over 2 W/m2K; to achieve 0.15W/m2K will require a rendered external insulation of around 200mm of EPS (expanded polystyrene). The good news is that cottages of this type would have been normally been rendered with a lime render and white lime wash which is not a million miles from a modern white, mono-couche external render.
As well as calculating the U-values you should also take care to avoid the risk of condensation; the correct way to do this is with a dew point graph which graphically shows the area in any construction build-up where condensation can occur. A condensation analysis can be carried out using simulation software such as WUFI, which is based on EN 15026, a European standard for simulating condensation risk.
Any new structure that extends the existing cottage will be easier to insulate to a high standard as we are constructing anew as per the roof.
The next logical step in thinking is to jump from the derelict cottages that are dotted throughout the country to the derelict houses in the ghost estates throughout every county. Theoretically they should be easier to upgrade to a better standard than the older cottages but their poor location and lack of infrastructure will remain an issue.
So, we have somewhere to live in to conduct our off-grid experiment — the next step is obtaining heat and power to the house. Trying to obtain passive house standards will drastically reduce the heat requirement for the house but it will not eliminate it entirely. The next blog post therefore will address this key aspect of off-grid living.
A quick round up of interesting stories you or may not have seen:
According to SEAI, the organisation is approving 1,000 Home Energy Saving scheme grants a week, at an average of €2,900. Press release and full report (down the bottom) are here.
More than a thousand applications for Home Energy Savings (HES) scheme grants are being approved every week and 98.5% percent of recipients say they would recommend the scheme to others, according to the Sustainable Energy Authority of Ireland (SEAI). The survey also revealed that over 68,000 grants have been awarded since the scheme began in April 2009.
Conference season is upon us — I attended See the Light 2010, the joint SEAI / RIAI passive house conference last week, and was impressed to see how far knowledge and expertise of the passive house standard has come in just a few years. There were discussions on planned passive-certified schools, excellent low energy housing projects and on the importance of accurate climate data when planning and certifying passive houses (and any building, really). Hopefully it's a sign that overall knowledge of low energy design is spreading — what's vital now is that associated knowledge of making sure low energy buildings are healthy, properly ventilated and built with minimal risk of condensation grows too.
Speaking of conferences, there's a few more ahead. Later this week, the Institute of International and European Affairs hosts one on the energy upgrade of buildings — details here. I'm hoping to get along to blog about some of the sessions — the afternoon ones that focus on international experience of retrofit programmes look interesting, and our own Jeff Colley will be chairing one of thse.
The Sustainable Building Show on October 7-9 in Dublin will also host a diverse series of seminars, and the details of Rebuilding Ireland 2010 at Plan Expo Green, to be held the first week of November in the new National Convention Centre, will be announced soon.
In other news this week (and there's a lot of it):
That's all for now — I should be back with more at the aforementioned IIEA conference this Friday. I'd love to hear your thoughts on any of the above stories.
In May we profiled the Nottingham House, an entry into Solar Decathlon Europe designed by a team from the University of Nottingham that featured an insulation system from Isover Ireland. The Solar Decathlon challenges university teams to design and build homes that maximise the sun's energy. This was the first year of the European competition - the US version is well established.
Anyway, here's a video from the University of Nottingham documenting the build process.
