Archive for July, 2008

Cavity wall insulation

In the midst of the chaos, one task was accomplished that was stress-free, low cost and went a long way to helping us achieve the energy efficiency we’re aiming for – cavity wall insulation. The original part of the house, dating from the 1930s, is of cavity wall construction. This means that it was built with two layers of masonry in the walls with a gap or cavity between them to stop moisture getting into the interior of the building.  This was an effective damp proof measure but it also created a ‘cold bridge’ which reduced the efficiency of home heating.  The idea to insulate the cavity began in the 1970s but did not become part of British building regs until the 1990s.  Cavity wall insulation was essential for us so that the ultra-efficiency of the extension wouldn’t be compromised by the external walls of the older part of the building.

So that’s the green criteria but low-cost and stress-free? This particular task cost us the grand sum of £110. I kid you not. When we looked for the greenest energy provider in our area, we happened upon Scottish Hydro’s Better Plan tariff.  Among the eco perks of the deal are that you pay for 100% renewable energy (although, as long as you’re linked to the national grid there is no way to isolate green energy specifically for your home; you are still sourcing from the ’pool’ of available energy); you get a free energy monitor to help you identify where you use most energy in the home so you can take steps to reduce it; you get credits for reducing energy; and – the best bit – they pay towards helping you achieve that. They give grants for cavity wall and loft insulation which are paid directly to the supplier so you only have to pay the balance. That’s how it cost us only £110. The supplier, Instafibre, called us to make the appointment, turned up and did the job with no disruption, making the whole thing probably the least stressful part of the project. We can’t recommend it highly enough, so here’s the link –  http://www.hydro.co.uk/ForYourHome/EnergyProducts/betterplan.aspx.

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When the going gets tough…

… lightweights like us don’t blog! The past week has seen communication problems as I went out of internet radar in Wexford and Donald was working as many hours as he could to get the house in a fit state for us to come home to so didn’t have time to post anything. This is a pity as we are at the point when a lot of the interesting stuff happens. Here’s a taster - to be followed by more details soon (I hope):

Windows – they’re all in, and very sexy they are too. This is one of the biggest factors for us in terms of both making the house energy efficent and keeping the costs down. The windows are Swedish-made timber-framed triple glazed, which would make most people think EXPENSIVE but Donald planned the windows for the extension around the standard sizes available off-the-shelf from the suppliers in Dundee (Rembrands) – saving us £££. We got a quote for comparison from Everest (“The Best”) who offered us uPVC ‘A-rated’ double-glazed and it still worked out cheaper to get the Rembrand windows. Sometimes it’s easy being green.

Walls – Donald has been busy stuffing the walls with hemp batts and erecting the wood fibre boards. Hemp is a wonderful insulation material – cheap, renewable and carbon-negative (meaning it stores carbon rather than releases it). I want to write loads about hemp’s thermal qualities, the u-values of our walls, how to source hemp as a material and how to construct walls with it but this will have to wait until Donald (the expert) is not actually drowning in the stuff. Anyone who fancies volunteering, he would welcome a hand with this part of the build.

Bathroom - Donald dismantled the old bathroom and moved the shower and sink (which we are reusing) into the back bedroom, which is to be our new bathroom, ready for the plumber on Thursday. Sourcing baths has been fun – the only ’green’ criteria we were able to use was air miles so we narrowed it down to Ideal Standard (formerly Armitage Shanks) and Carron (a Scottish company). Everything else has most likely been made in China and shipped around the world so we’re keeping it local. I did find some lovely mosaic tiles made from recycled glass to complete the room – more on which later. Ditto flooring.

Wall slap – The time had come to break down the wall between the old house and the extension. This was supposed to be the fun ‘boys with toys’ bit that Donald was really looking forward to. In reality, it was one of those self-build moments when you ask yourself ‘what have I let myself in for?’. It was messy, dusty, heavy work and halfway through it the saw packed up, after the hire shops had closed on Saturday, so the job couldn’t be finished until Monday. And then the lintel for the new hole in the wall proved very awkward to put into place. And the poor ladder took a battering from falling masonry. All I can say is, thank God I wasn’t there to witness.

Kitchen – the kitchen arrived from Ikea but there is nowhere to put it until after the ‘wall slap’ rubble is cleared and all the hemp has been used. So it’s sitting in boxes in the sitting room, awaiting its turn. There is now, officially, no more room. Did I mention I’m glad I’m not there?

All this and Donald also had a work deadline for a client so blogging has, for now, fallen off his list (which is admittedly rather long). The good news is that he has kept a photo diary of all the stages and we hope to share them soon.

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Watertight at last

Well here we are at last with a watertight shell.  It has seemed a long time coming but at last the rains can come if they wish.  The slater has completed the roof and done a mighty fine job of it.  All the windows are in and at last the kitchen door, which we’ve been dying to get in, is in.  It wasn’t the easiest of things to fit and the instructions were written in some obscure dialect of double dutch.  But they’re in and are absolutely lovely, very smooth operating and a gorgeous finish. 

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That’s it, I’m leaving

We knew the time would come but the situation has become untenable. Since the school holidays began the lack of access to the garden, coupled with the cramped living conditions inside, has been a big issue. Stressed parents and stir-crazy kids is never a good combination so today Gill and kids are leaving Donald for a month. Our departure coincides with the arrival of an enormous amount of hemp (and no, he is not going to smoke it all, it’s for the building).  And my last act was to order the kitchen, which will be delivered on Tuesday for him to assemble. The enormity of his task has hit just as we are about to desert him. Heh heh.

We’ll be managing the blog between us - photos from the site, text from afar to keep you updated. We fully expect to arrive home in August to a completed extension (no pressure or anything).

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View from the top

Our slater is brilliant. He arrives every morning at 8 and works through ’til 5pm. Sometimes we even remember to offer him a cup of tea. And we’re really seeing the progress he’s making. This is the view from the scaffolding (very wobbly when you’re on the top floor!). We now have two velux windows in as well so we’re very nearly water tight. Just as well, as the insulation materials are arriving and we don’t want them gettting wet, despite the Scottish weather’s best efforts.

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Inspiration

Eco building, Findhorn style

Eco building, Findhorn style

We spent the weekend with friends in Forres in northern Scotland, which is just down the road from Findhorn. Findhorn is the original eco village – see www.findhorn.org – and we took a stroll around for inspiration. There were eco houses of all shapes and sizes, from stone ‘hobbit’ houses with grass roofs to luxury timber clad houses with solar panels – and everything in between.

The vibe was really lovely although community living is something you would really have to commit to. It would be nice if that sense of community and oneness with your surroundings was the norm and not something you have to take yourself out of society in order to achieve. But we came away inspired and, having had so much fun this weekend, sorely tempted to move further north! Just have to finish this eco house before we can move on to the next one : )

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Movin’ on up

Scaffolding erected

Scaffolding erected

Yesterday morning we were awakened by the sound of clinking and clanging. It was the scaffolders and they were early! On possibly the first summer’s day of the actual summer they worked away, putting together what looked like a giant meccano set. With the joiners also working full tilt, to get the roof ready for the slater, it felt like a proper building site. When the slates were delivered, a mixture a Welsh and Spanish to add to the reclaimed ones from the old roof, the street was lined with white vans – much to the chagrin of our neighbour. 

The highlight of the day was when one of the scaffolders hopped over the neighbour’s fence to fix the scaffold from her side, causing quite a flutter when she glanced out her window and saw a semi-clad (it was hot!) tattoed bloke smilling back at her. Sorry ladies, no photos : )

One of the great things about scaffolding is that it is re-used many times over its lifetime and the steel it’s made from is easily recycled after that.

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Dilemmas – kitchens

One of the things you learn very quickly is that there is never one obvious eco-friendly choice, there are just greater or less than desirable options for you to deliberate on. Even on green building forums there is no consensus about ‘definitive’ eco materials. There are so many factors that have to be considered and how do you compare one against the other? There are those that argue in favour of concrete – it may be carbon-heavy in production but then you have a highly thermal efficient building which will ’payback’ that carbon in heat savings over its lifespan, which may be hundreds of years. Anti-concrete arguments include the fact that its production is one of the biggest sources of carbon emissions (some estimates put it at 10% worldwide) and that this isn’t acceptable, whatever its lifetime analysis. It’s also not reusable or biodegradable at the end of the building’s lifetime. So who is ‘right’? It comes down to informing yourself and then making the best choices you can with the resources you have. Any effort towards sustainability and energy efficiency should be welcomed.

This post is about a typical ‘more questions than answers’ scenario. We’ve been trying to source our kitchen and finding sustainability isn’t even on the radar. Only one manufacturer (Magnet) is working towards developing a sustainable unit ’soon’. Ikea, on the other hand, at least have a sustainability policy (and an agreement with the Woodland Trust to plant trees). But Ikea don’t manufacture their kitchens locally. To keep prices down they have factories in countries with low labour costs which transport the kitchens around the world. So, do we go for sustainable kitchen units with a lot of air miles attached or do we buy British-made units with no traceable source for materials? 

Another issue, when you’re on a tight budget, is cost. Comparing the kitchen we want (including appliances) from Ikea to a similar one from Magnet, the difference is about €3,000 – even with Magnet’s very generous sale prices. Presumably what you get from Magnet is better quality workmanship so it should last longer – and longevity is important. But Ikea offers a 25 year guarantee on their units compared to Magnet’s 15. 

Magnet only fit ultra-efficient appliances such as AEG and NEFF, while Ikea offer A-rated Whirlpool appliances. But what appliances to go for? The choice for cooking comes down to gas or induction hobs. Gas is more efficient than regular hobs (we can find figures for that) and induction hobs are more efficient than regular hobs (we can find figures for that too) but how to you compare gas and induction? 

We know that grid electricity is hopelessly inefficient (for every 100 units of energy produced, only 22 are actually utilised by the end user) so do we go for gas, which is more efficient but is a non-renewable resource? Gas is also cleaner than electricity – 1kw of gas emits 0.194kg of CO2 versus an average 0.568kg per 1kw of electricity (depending on the source). But, what if you are signed up to a green energy tariff or supplier (as we are), making our electricity greener than gas? That would make induction seem a better option. Again, cost is a factor – the induction hob would cost around £500 more.

And what about future-proofing your supply? If gas and energy prices continue to rise and finite resources such as oil and gas run out, what will they be replaced with? We have already decided to stay on-grid as it is impossible, with our resources, to make a suburban semi self-sufficient in energy needs. Micro-renewables such as wind turbines and solar panels are not suitable for our setting – in a natural dip with little south-facing roof space in a fairly dark part of the world. There is much debate about whether it is an efficient use of resources to invest in ‘micro-renewables’ for individual households rather than in vastly more efficient wind farms or decentralised community-based energy schemes. We’re also hoping that biogas becomes a viable alternative to natural gas without disruption to the supply network. 

Only one thing we know for sure and that’s what counter top we’re going for. Imported granite and timber from non-sustainable sources are obvious no-nos but what’s the alternative? We sourced a very funky counter top made from recycled glass. Not that this is a cheap option, despite it being made from a very cheap raw material, but this is one of the luxuries we’ve allowed for in the budget. It will be the centre-piece of the kitchen and boost our green credentials, whatever else we decide.

At the moment, we’re leaning towards Ikea and still debating the gas / induction issue. We would welcome some feedback on this - please do send us your tuppence worth.

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