More on ferrocement http://opensourceecology.org/wiki/Ferrocement
How light is light? Kilograms per sq meter? El 13/03/2012 15:18, "Alejandro Moreno" <[email protected]> escribió: > Chris, > > Polyiso boards are indeed "recyclable" in a sense. You simply repurpose > them, i.e. after you break down your yurt, you can use those very same > panels in another construction project, like a home, a toolshed, or a > chicken coop perhaps, whatever you can think of. You can even sell it to > someone else after you're done with it (I did). > > Many people get stuck in the "it has to be shreddable" thinking mode, > thinking that in order to be recyclable, there would need to be some kind > of recycling service out there that will somehow pulverize and repurpose > the transformed materials. That's not the case. The polyiso boards are > worth more intact than they are shredded or pulverized. > > I was going to use my H13 eventually for insulating a chicken coop here at > my home that we want to build. I would've done that but, someone ended up > buying my H13 from me to use at Burning Man this year (I can't go). They > said they intend to reuse it many times. Of course, their idea is to reuse > it as a yurt several times. Though there's no reason it can't eventually > end up being part of a permanent construction project some day. > > If you do choose to go with polyiso, taking into account your temperature > extremes and the length of time your yurt will be used, I would recommend > at the very least 1.5" thick panels. I used 1" thick which was fine for > BM, and/or for any short term stay. For you, definitely 1.5" at the very > least. Of course over there they might get measured in centimeters, though > since they're produced in the USA, they may come in inches anyway. > > I used the alternative H13 design which uses the Camp Danger Hinge > technique for taping the panels together (instead of having to mitre the > panels). I can't honestly say whether the bidirectional filament tape > would suffice for your purposes long-term with rain, cold, UV, heat etc., > but my gut says it's better to err on the safe side and go with Vinay's > suggestions, and use more time-consuming, solid measures to hold your > panels together. > > And if you can't get a hold of polyiso over there, just go with plywood, > Vinay has a video for this too: > http://vinay.howtolivewiki.com/blog/other/plywood-hexayurt-construction-details-1573 > > Suerte, > > -Alejandro > > > 2012/3/13 Lucas González <[email protected]> > >> Hexayurts in Spain. Hadn't seen that on the email subject! >> >> >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. >> >quick to build which I can live in for a while. >> >sustainable (or least recyclable) materials >> >durable enough to last a few years and be usable all year around - which >> I think means it needs to be insulated. >> >summer (30 degree centigrade plus), winter (down to -3 in February >> >fairly dry, with most of the 750mm of annual rainfall happening in >> winter and days of 30mm+ rain not uncommon. >> >> I've never built a real size hexayurt, just small models. >> http://imagina-canarias.blogspot.com/search?q=hexayurt >> And helped with documentation. >> http://www.appropedia.org/Hexayurt_H13_Plywood >> See if some of that helps? >> >> Maybe the "ferro" part can be cloth? >> http://www.ferrocement.com/bioFiber/y5-1x2/biofiber_y5.1.es.html >> >> My experience with supplies in the Canaries is not that good. >> Managed to find marine plywood, but not the poli-iso panels. >> Maybe I don't know what to look for, or where. So if you find them, I'd >> love to know the Spanish name for it. >> >> Gracias. >> >> Lucas >> >> >> 2012/3/13 Vinay Gupta (Hexayurt Shelter Project) <[email protected]> >> >> 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. >>> To post to this group, send email to [email protected]. >>> To unsubscribe from this group, send email to >>> [email protected]. >>> For more options, visit this group at >>> http://groups.google.com/group/hexayurt?hl=en. >>> >> >> -- >> 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 >> [email protected]. >> For more options, visit this group at >> http://groups.google.com/group/hexayurt?hl=en. >> > > > > -- > -Alejandro Moreno S. > GreenMBA, Dominican University of California > Cell (415) 578-8731 > LinkedIn <http://www.linkedin.com/in/alejandromorenos> > > -- > 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 > [email protected]. > For more options, visit this group at > http://groups.google.com/group/hexayurt?hl=en. > -- You received this message because you are subscribed to the Google Groups "hexayurt" group. 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