Ah, yes, I've been reading your web site with some interest! Could I persuade you to permanence?
We *think* that polyiso + ferrocement is the way to go - extremely durable, multi-decade buildings for very little money, fully insulated, long-term waterproof, rotentproof, sun-proof, bug-proof etc. so rather than building a temporary thing and recycling it, you build a permanent thing which is *very* light on materials (the cement is only 1cm thick or so!) while we evolve a good soy-based insulation foam (it's coming, lots of people are working on it.) Have you seen the "hexayurt for haiti" doc which describes how to lap the pieces for waterproofness, and seen Dylan Toymaker's insulated panel H13? Vinay On Tue, Mar 13, 2012 at 3:41 AM, Christopher Fraser <[email protected]> wrote: > Hello, > > I'm part of a group developing an permaculture / Open Source Ecology > project in Extremadura, Spain. > > http://openeland.org/en/ > > We're organising a two week summer camp where we will have a number of > workshops etc and I'm planning on moving to the site for a few months to > get the site ready. > > So, I'm wanting to build a structure which will be quick to build which I > can live in for a while. It it works out I may be some more for the camp. I > want to use sustainable (or least recyclable) materials as much as possible > and want to structure to be durable enough to last a few years and be > usable all year around - which I think means it needs to be insulated. > > The site is fairly hot during summer (30 degree centigrade plus), but gets > cold over the winter (down to -3 in February when we were camping there!). > It's general fairly dry, with most of the 750mm of annual rainfall > happening in winter and days of 30mm+ rain not uncommon. > > I've also been looking at small building designs like these: > > http://www.countryplans.com/**jshow.com/y2k/listings/3.html<http://www.countryplans.com/jshow.com/y2k/listings/3.html> > http://www.simplesolarhomes.**com/steps-for-building-a-**small-solar-home/<http://www.simplesolarhomes.com/steps-for-building-a-small-solar-home/> > > I'm also thinking about a Hexyurt, but concerned about getting the weather > proofing and insulation right. > > One options is to build insulated panels for the roof and walls. Help, > wood, or cellulose is probably the preferred insulation to be sandwitched > between the OSB on the outside and some other interior board (probably more > OSB), but rockwool is currently about 10% the cost here at the moment (and > is apparently partially made from recycled materials and itself recyclable). > > I can visualise how the panel construction for the walls, with vertical 60 > degree wedges between the panels sealed with silicone. I'm not completely > sure how the roof would work and would be interested to hear ideas. > > One thought is that a good quality of seal between the top of the walls > and the roof could be achieved by a layer of foam that compresses when the > roof is put on. > > My main concern is water getting in the roof seams. I was thinking I could > cover the whole structure in tar paper, but I don't seem to be able to > source it in the UK or Spain. The plastic membrane equivalents are only UV > stable for a few months. > > My next idea is the membrane could go under the OSB. It would be quite a > complicated construction but the only way I can see it working is there's a > strip of plastic under each edge seam, which is allowed to fold into a bit > of a valley and is secured on the inside by two pieces of batten (which > would also form the cavity for the insulation - will be complete pain to > cut and fill with rockwool type insulation). > > I'm not sure if a H13 form roof construction would make this easier by > only having two angled roof edges or harder by introducing a horizontal > seam. > > Compressible foam could also be used between the roof triangles to improve > air tightness. I am thinking about passive heating and cooling ventilation > like this: > > http://www.simplesolarhomes.**com/category/passive-cooling-**and-heating/<http://www.simplesolarhomes.com/category/passive-cooling-and-heating/> > > Anyway, I'm interested to hear ideas. I realise polyisocyanurate > insulation boards would be much more straight forward, but I am keen to > avoid it as it's not widely used or recycled (in Europe at least, as far as > I know). > > Christopher. > > -- > You received this message because you are subscribed to the Google Groups > "hexayurt" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to hexayurt+unsubscribe@** > googlegroups.com <hexayurt%[email protected]>. > For more options, visit this group at http://groups.google.com/** > group/hexayurt?hl=en <http://groups.google.com/group/hexayurt?hl=en>. > > -- Vinay Gupta Free Science and Engineering in the Global Public Interest http://bit.ly/gupta_arc <http://bit.ly/gupta_arc%20>- the Gupta State Failure Management Archive http://bit.ly/gupta_ark - or see it directly on Archive.org http://hexayurt.com - free/open next generation human sheltering http://hexayurt.com/plan - the whole systems, big picture vision "In the midst of winter, I finally learned that there was in me an invincible summer" - Albert Camus Twitter/Skype/Gizmo/Gtalk/AIM: hexayurt UK Cell : +44 (0) 7500 895568 / USA VOIP (+1) 775-743-1851 -- You received this message because you are subscribed to the Google Groups "hexayurt" group. 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