Vinay, Instead of Reflectix, I recommend ProDex, which I have used. It has many advantages over Reflectix.
Samarpan PRODEX Total Insulation: <http://www.insulation4less.com/prodex_ffmf.asp>This is the ultimate energy saving product. It is ICC-ES Recognized *AND* ENERGY STAR qualified. Eligible for the 2009 Tax Credit<http://www.insulation4less.com/tax_credit_summary.asp>. This 21.10 R-value product (double layer, 15.67 (single layer) - details<http://www.insulation4less.com/prodex_ffmf.asp>, reflects 97% of radiant heat (the primary source of heat flow). Prodex works well in HOT and COLD climates. It serves as a thermal break and vapor barrier. Ozone friendly and safe to work with, Prodex is used in homes, commercial buildings and pole barns. It eliminates condensation, provides 19db sound proofing, and is easy to install. It contains no asbestos or toxic vapors in case of fire. Unlike fiberglass insulation, Prodex contains no itchy fibers to breathe or cause skin irritation. Unlike fiberglass insulation, Prodex is unaffected by humidity or water and does not mildew or promote fungus growth. Built for consistency in performance, it handles punctures and temperature extremes better than bubble wraps. Two layers of reflective aluminum foil surrounding a 1/4-inch closed-cell polyethylene foam center. On Mon, Jul 13, 2009 at 2:09 AM, Vinay Gupta <[email protected]> wrote: > > So, for people having trouble sourcing Thermax HD, let me suggest an > alternative route: Plywood covered with Reflectix. > Reflectix is that foil-coated bubble wrap stuff. It's about 25 cents a > square foot, so say a hundred dollars to cover a Hexayurt. (might be more > than that, I'm going from memory.) > > High R-value, mirror finish shiny, excellent on the outside of a hexayurt. > You'd probably hold it in place with staples or tape. Staples probably. > > For the plywood hexayurt, there's a few approaches. One that I'm confident > of is wooden or metal brackets and screws/bolts. You need 120 degree and 150 > degree pieces. If you lap the plywood, you get one effect - slightly smaller > but possibly *quite* tight. If you don't lap them you'll get tiny cracks > between boards. > > The one we did at the ecovillage in London was really just a warm up. The > next one will be properly documented and I'll publish plans too. > > One other point: the Sleepbreeze cooler is a 12V case fan running off a > solar panel with a duct. I think it'd be a good idea to make a piece that > fitted at the point of the roof, perhaps that the boards slotted into, with > a fan set to blow out of the Hexayurt (furnace filter!) taking hot, stale > air out of the top. You could run it direct drive off a solar panel. You > could also wire in some 12V lighting (might need a voltage regulator, panels > kick out up to 19V) and/or batteries. In a developing world application, I'd > stick on a DC-DC voltage regulator and a mini-USB port to do phone charging > too, sort of like a "utility node" at the top of the hexayurt. > > I've been talking about that stuff for several years, since I left America > in fact. One of the folks I've been discussing it with sells an *excellent* > (and I've tested it) cooling device that's ideal for Burning Man: > http://sleepbreeze.co.uk > > I'll have some video of that on the vblog later, but it's an excellent > piece of kit. My friend Andy makes them, and they work as described. > > Anyway, Andy and I have been scheming since I left the US about doing a > proper roof cone electronics package for the Hexayurt, and while the > Sleepbreeze isn't all that I'd want in that top node, it's a start. If the > box had mini-USB out running off the same voltage regs as handle the fans, > and some LED lights, it'd be damn near perfect. > > Vinay > > > > -- > Vinay Gupta > Free Science and Engineering in the Global Public Interest > > http://bit.ly/flucode - please follow the Flu Code > if you are in a flu-effected area. It protects us all. > > http://guptaoption.com/map - social project connection map > > http://hexayurt.com - free/open next generation human sheltering > http://hexayurt.com/plan - the whole systems, big picture vision > > Gizmo Project VOIP : (USA) 775-743-1851 > Skype/Gizmo/Gtalk/AIM: hexayurt > Twitter: @hexayurt http://twitter.com/hexayurt > UK Cell : +44 (0) 0795 425 3533 / USA VOIP (+1) 775-743-1851 > > "If it doesn't fit, force it." > > > > > --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
