SIPs - Genius Idea

Once we got planning permission, one of the first decisions we had to make was - how are we going to build our house? Only a few years ago the choice was simple, wood or brick. Now there is the option of straw bales, durisol bricks, thin joint blocks, ICF blocks, SIPs and many other even more obscure building materials. For our needs, SIPs (structural insulated panels) seemed to be ideal. They are a sandwich of wood chip board and insulation, a little less than six inches thick and produced in enormous sheets. At the factory, they are cut into sections for your house walls and roof, holes are made for windows and doors and the whole lot are wrapped up and sent on the back of a lorry to the site.

here's an offcut 

Once they arrive on site, they're glued and screwed together to make up the entire shell of your new home. From bare slab to complete shell can take as little as a couple of weeks. Whilst the speed is impressive, the most significant feature of SIPs are that you end up with a shell that is consistently and robustly insulated. The few joints that are needed to connect panels are glued and airtight. The result is a home that is easy to heat and easy to keep warm.

in a few years time, SIPs will become a significant force in UK construction

SIPs have been used for decades in Canada and some parts of Europe. Whilst they are relatively new in the UK, the market has been maturing. Early experimental homes have given way to a well established stream of new buildings. The benefit to self-builders is obvious - you can build a top spec, energy efficient house for a sensible cost and at low risk. Developers are beginning to catch on and I'm sure that in a few years time, SIPs will become a significant force in UK construction.

After talking to a number of suppliers, we chose SIPS @ Clays, who have proven to be enthusiastic and experienced. They deliver something like a house a week from their base in Skipton and take pride in the results they achieve. The houses are first drawn up in CAD, then cut and delivered for their construction team to erect. At the moment we're making the final small revisions to the CAD model and in a few weeks they'll begin to cut them up for construction this summer. Between now and then though, we need to prepare the site and lay some foundations.

Stud Locator

We're doing a little bit of re-organisation in the caravan. Will has been in a proper bed for some time and Becky is ready to do the same. They're on holiday with their mum and grandparents in Scotland right now, sharing a bedroom and loving it. They go to bed full of giggles and chatting to each other until sleep overtakes them.

I, on the other hand, am in the caravan with a bunch of 3x2", a saw and a couple of sheets of MDF. Whilst the rest of the family enjoy their holiday I'm moving bedrooms around so that the kids can share a room at home.

To help the job, and in the vague hope that I could avoid drilling through a mains cable, I bought a stud locator. So far with relatively thin caravan walls it appears to work well so I'm happy with my purchase.

Except...

Except when I got it I carefully put it away so the kids wouldn't find it and wreck it. Now I can't find it. I would see if I could buy a stud locator locator, but I'm afraid I might loose it.

Thorough Repurposing

 

We had a shed (one of many), about 6' x 4' tucked into a corner by the outside toilet. It had clearly been there a few years and was happily rotting away, roofless and sagging in the bottom.

Today's weather has been fantastic, so I've been busy with a saw and my handy bucket of nails. The shed is a shed no longer, and we have a coldframe to get our seeds off to a good start for the summer. The lid is a door from an old server cabinet. Putting it together was quicker and easier than going out and buying a shiny new one, and a lot more satisfying. If I could conjour up a greenhouse as well I'd be a happy man.

Now we've got to get on with some planting.

I Can See a Floor In These Plans

 

Above, there is clearly visible a floor that isn't there. The not-there floor affords visitors to the caravan a fine view of the ground below. It isn't there because I spent yesterday repeatedly hitting it with a big hammer. The hammer attack was very theraputic, but my mental well being (already under question) wasn't the issue.

The real reason for the vandalism was that our shower has never been entirely water tight. The escaping water has spread into the floor around the bathroom - in particular the hallway. Unfortunately, being made out of MDF the floor soaks up water as though it was in a kitchen towel advert and then starts sagging between the joists. As the job of fixing it was going to be a dirty, fiddly day of grubbing around under the caravan I must confess I put it off. After all, the carpet has been doing a fine job of taking our weight when the floor below it had given up.

 

A day later and here's the new floor. No more sags, no more unexpected bounciness to your step as you go through the hall. It's going to take a while to get used to it really.

As a welcome side effect, William now believes I'm Bob The Builder.

Plumbing - Miserable Work

After over a year of irritation I finally got round to replacing the mixer tap in the caravan. I'm sure new washers would have drastically improved it, but it had got into the habit of turning itself on when off and off when turned on. Whichever would be the most inconvenient. Not only that, but the arm of the tap had become so stiff that moving it threatened to pull the sink from the kitchen surface. No doubt these problems could have been fixed with a complete disassembly and overhaul, but for a few pounds we could get a brand new tap from our local DIY store that had nice ceramic washers, quarter turn taps and a silky smooth arm. Even if it had worked perfectly, the old tap was a fiddly awkward thing so replacing it was an easy descision to take.

Except then I had to fit the damn thing. Half a day of crouching under kitchen tops, cutting my fingers on tortured copper, getting soaked, covered in grease and rushing to get to the main valve in time reminded me why I hate plumbing so much.

Electrics are fine. Plumbing... less so.

I don't mind wiring (though with the new regulations, it's not so much an option these days). Electrical work can be checked and is either right or wrong. At no point does the current in the wires attempt to force them apart. A simple physical inspection shows you if you've made a good job and then the connections are very unlikely to leak 'just a bit', or slowly get worse with time.

By way of contrast, you can connect up a tap and wait for a few minutes before the joint that you thought was soundly tightened goes bang and geysers water out of the cupboard that made it so hard to reach in the first place. At this point there's no convenient trip switch that switches off the water. Instead you have to do the hundred yard dash to the stopcock whilst the kitchen erupts into mayhem. Then after a bout of mopping up, it's time to make the connection again, wringing its neck with a couple of spanners hoping to find that magic point where it's tight enough but not so tight as to strip a thread or twist itself into collapse.

When we start on our house I'll happily run cables around. Might even plug a few things together if it can be inspected to pass regulations. The plumbing though - that'll be someone else's job.

How to Keep Warm in Winter

Here's a little video I've made about the hot air blower we're going to use to keep ourselves warm this winter. It's the first video I've made, so it's rather simple, but I'm pretty pleased with it.



Now that we've sucessfully made biodiesel from the oil we've been collecting, we can use it to run a heater. It's a very sophisticated device, burning the fuel like a little jet engine and using a heat exchanger to warm up nice fresh air. The heater pushes out an enormous volume of hot air and will be connected to warm our bedroom and bathroom. Though it sounds pretty noisy in the video, once it's warmed through it settles down to be much quieter. Adding a silencer and hiding it away under the caravan should let us keep it on throughout the night without disturbing our sleep.

Monkey!

 

I was going to put up a picture of the 'repairs' I've done on the shower in the caravan. The plastic it's made out of is old, yellowing and rather brittle. When the caravan was used irregularly for the previous owners' holidays it was certainly up to the job. Now that we've been showering regularly for over a year of continuous occupation, the cracks are showing.

Literally.

The disturbing sign of leakage isn't wet feet or musty smells. Instead the chipboard that the floors are made out of starts to sag where the water has penetrated them and softened the glue. These little dips that bounce as you walk over them act as a map showing where the shower has sprung yet another leak.

So, knowing that plastic like this can only be stripped out and replaced, and that a specially caravan sized shower will no doubt cost way too much, I've botched it. Fibreglass repair tape and resin used to build and repair small boats does a fantastic job of holding the edges together and keeping the water in place. It's not pretty - not even slightly - rough and browning as the resin reacts with daylight. But it works, so I'm happy.

However, having taken a photo to share online, I realised just how ugly it looks. So instead here is a picture of Monkey, one of William's favourite toys who unexpectedly got thrown into the bath and has had to be given a seat to dry out again. 

The Often Forgotten Fifth Teletubby

The shed roof is (was) corrugated asbestos. Strangely the beams that I thought were holding it up stopped six inches short of the lintels that should have been supporting them. There's no evidence the two ever met, so it seems the roof was holding up the beams, which I'm pretty certain is the wrong way round.

It's taking a while to dismantle it - dressing up like a grubby teletubby soon gets very warm the moment the sun comes out. The other sheds will (hopefully) be taken down by someone else, who can do all the messy work. In the mean time I need to sort this one out, so - after a long cold drink - it's back to the protective gear. 

Chicken House

Even if we can't build our own house just yet, we can build something for chickens to be proud of (we hope).

We're going to be getting four birds from Fenland Fowl, hopefully to give us some lovely fresh eggs. There's just time to go and buy feeders, drinkers and layers pellets, and then we'll see if the cunning chicken coop design works.

The nettles in the background are making a last stand before the strimmer gets dusted down. Try to ignore them - we do.