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== Links and videos ==
== Links and videos ==


* [[Hexayurt_Plywood|Plywood Hexayurt]]
* [[Hexayurt_Plywood|Plywood Hexayurt]] and [[Talk:Hexayurt_Plywood|more]]
* H13:
* H13:
** [http://vinay.howtolivewiki.com/blog/hexayurt/hexayurt-h13-at-the-cloughjordan-ecovillage-2536 Cloughjordan ecovillage] ((direct link to blip video))
** [http://vinay.howtolivewiki.com/blog/hexayurt/hexayurt-h13-at-the-cloughjordan-ecovillage-2536 Cloughjordan ecovillage] ((direct link to blip video))

Revision as of 19:19, 27 July 2011


THIS PAGE IS CURRENTLY UNDER CONSTRUCTION ((WITH MISSING STUFF SIGNALLED WITH DOUBLE BRAQUETS LIKE THIS)), BASICALLY BECAUSE IT'S HARDER TO UNDERSTAND RELATIVE TO, SAY, A CARDBOARD MODEL :-P. SO, EXPECT MANY CHANGES. DON'T TRUST FOR BUILDING YET. CONTRIBUTE IF YOU CAN - MAYBE IN THE DISCUSSION/TALK PAGE? LucasG 09:05, 27 July 2011 (PDT)

H13 Plywood

  • Vinay Gupta invented the basic shape in 2003. The H13 was designed by Scott Davis and Dylan Toymaker (design published in November 2010). The H13 adds one panel to the “classic” H12 hexayurt, but that one extra sheet of plywood gets an 8′ roof line and 2-3 times the walkable space inside the hexayurt.
  • The H13 has been built with polyiso panels and there's even a design to make it folding. This page describes the specificities for a H13 built with wood. This means:
    • The connectors need to be stronger than with lighter panels.
    • Fixing the hexayurt to the ground is probably needed only if there's risk of earthquakes or landslides (see the Haiti pdf below).
    • Water-proofing and insect-proofing need to be considered, asking the local experts.
    • Portability will most likely need a group of synchronised carriers (or mechanical help of some sort).

Links and videos

((We could take some snapshots from some of the videos in order to have still pictures for this wiki page.))

Before you start

Tools

If power tools are available, use them.

  • Cut some of the panels: 5 diagonals, Sri Lankan corners, trimming.
  • Cut the block: at 90 degrees, at 120 degrees and at 150 degrees.
  • Screw about ((200 number)) 2" deck screws.

Naming the pieces

  • A "panel" cut through the diagonal gives us 2 "triangles". Please refer to this chart to name the "panels" and "triangles". (By the way, you can use this chart to print it on paper, then cut and fold it, and just cello-tape the walls (1a to 2a to 3a to 3b to 2b to 1b to 1a).

H13plywood2ColorsArrows.PNG

  • The "wall" has 6 "wall sides": 1a, 2a, 3a, 1b, 2b and 3b. Each has a small triangle cut off. The triangle is a rectangle triangle: measure 6 inches for each leg of the triangle, then cut through the hypothenuse. This is called the Sri Lankan corner, because it was invented in Sri Lanka (V has the details).
  • The "wall sides" are joined together with 12 wooden blocks, 2 at each angle, which are made from 2"x4" wood, cut at a 120º angle.
  • The "roof" has 2 "classic roof sides" (4a+5a and 4b+5b), 2 "big roof sides" (6a+7a and 6b+7b), and 2 "horizontal-vertical roof sides" (8a+9a and 8b+9b). ((Not sure if the "big roof sides" are 6+7+8, and then we have "front walls" which would be 3+9. Looks simpler this way, no?))
  • There will be "blocks", cut off 2"x4" lumber: some are cut at 120º angle, others at 150º angle and others are used "flat" (signalled with different colors). The following pictures shows MOST of the blocks right. Still looking at the video (above) to find out if some are wrong! Sorry, no high visual skills! LucasG 08:38, 27 July 2011 (PDT)

H13plywoodGrayWithBlocks.PNG

Understand overlapping

Polyiso panels are used full-size with no overlapping, but plywood is different.

((The following needs to be checked visually against the video above. "With enough eyes, all bugs are shallow" - Linus Torvalds. So thanks for double-checking!))

As for the normal roof cone - obey the normal order, until you get to panel 7. 7a and 7b both go *over* 6a and 6b, then 8a and 8b go over 7a and 7b. At the top, along the roof line, 6a-7a-8a extend over 6b-7b-8b.

If the boards are trimmed, a little slot taken out of 7b and 8b, the whole thing should fit tightly at the roof line. The slot is analogous to the roof cone trimming. Let me try to explain.

Basicaly, where 6a overlaps 7a, there's a section where the wood is two layers thick. 7b is pressed against 7a, but at that point of overlap, 6a gets in the way. 7b is trimmed so that 6a doesn't get in the way. You wind up cutting a piece the thickness of one piece of plywood, and as wide as that overlap, out of the top right corner of 7b so that 7b can fit tight against 7a, basically.

This will probably make sense in a model if you overlap the pieces in the model.

Buy

Wood

  • 13 panels of plywood or OSB3. Each is 4" by 8".
  • 2" by 4" lumber. ((how much))
  • Also ... no, that's it regarding wood.

Screws

((number)) 2" deck screws. Any head is fine. Non-countersinking screws are better because they don't weaken the plywood wood where the screw is by crushing it or cutting into it. "Wafer head" seems to be the name for these, but I (V) have never found them locally, so I use regular deck screws!

Other stuff

  • Glue. ((how much))
  • See insulation, door, etc.

Cost

Very local, but let's say it's ... ((18.9€ or less buys a 10 mm thick panel of "Chinese plywood" in a location placed at the very end of many supply lines.))

Build it

Cut wood

Sri Lankan corners: cut off one 6-inch corner of each of the 6 panels that will make the walls. This is called the "Sri Lankan corner" because it was invented in Sri Lanka. ((picture))

If you want to cut a window or two in one of the panels, this is when you do it, but make sure you don't cut through the edge of the panel, so that structural integrity is retained.

Cut triangles: 5 panels, through the diagonal.

Trim off the point of each (?) of the 10 triangles. This is done cutting 2 small triangles off the point. The first ... and the second ... See the figure ((Haiti pdf)).

Trim panels. ((see below))

Cut blocks with different angles:

  • flat/straight ((number)) ((size)) ((method))
  • 120º ((number)) ((size)) ((method))
  • 150º ((number)) ((size)) ((method))

Prepare the building site

Place the walls as an hexagon. To do this, you start by marking the hexagon with a string: place a peg at the center and draw a circle that's 7.5 feet radius, then use the radius from one point in the circle to mark the six corners of the hexagon. Each wall doesn't begin where the previous one ends, but 6 inches before (see figure).

Maybe place blocks and make sure they are aligned with the horizontal plane, with communicating vessels?

Make walls

Start with 6 panels, each 4'x8' (120 cm by 240 cm).

Start with 2-inch by 4-inch wood and cut 12 blocks. Each of the blocks has a 120º angle. There will be 2 blocks in each corner, one near the ground and the other near the roof.

Screw the blocks to join the walls together. ((XXX-number)) of 2" deck screws are needed for each block.

Make roof

The roof is built from the back forwards.

Because we have the nice vertical boards, 5b goes in last, and can be screwed into place from the outside, so nobody is left stuck inside of the hexayurt in the same way as you get with the normal roof cone construction. This is very important and it's a much easier build because we don't have the same problems getting to the last two boards.

When the roof is lifted and put on the walls, however, 5a/5b tends to fall over 8a/8b because, well, there's nothing to stop it! On the rest of the sides, the roof cannot fall past the walls because the roof is at an angle. But these two wall pieces are both vertical, so it falls straight past. I think the answer is to put an 8' high 2x4 piece inside the roof, wedged up against the point to hold it up while the walls are lined up, then screw 5b/8b and so on (ah, that will be 3 more flat blocks each), and then screw the 8' 2x4 piece of wood into the vertical part to hold the point of the roof stable.

This is just my (V's) best guess, of course, we're going to need to build a few more before we're completely sure! But the key is that it's actually easier than the regular version.

Also we haven't figured out the best way to do a door yet.

Put roof on top

Gang carry! ((see video of H12 in EWB))

Beyond the very basics

Door and windows

Insulation

Permanent H13 (ferrocement)

Toilet etc

Help improving the documentation

  • raw footage
  • pictures ((from video, or taken specifically to show each roof part from outside and from outside - someone in Cloughjordan? (hint, hint)))
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