Wanting to being able to quickly cover various things from the rain I have investigatedcanvastarpaulins and bought a flax tarpaulin (March 2017). (July 2019 bought two more :~ see comment 3)

UPDATE April 13th 2019 As I've ordered wood for the base and wanting to cover it as it is being built I have got around to using the tarpaulin. I started tooil the canvas,in situ, and noticed the brass rings had stains, I became concerned they were plated steel but a magnet check shows they are not.

UPDATE April 18th Came back two days after rain to find puddles on tarpaulin showing the level of proofing when new.

UPDATE April 21st Finished coating with linseed oil. Used approx 12Lt linseed oil and 10.5 Lt of Turpentine and Stockholm tar (9:1.5)

UPDATE April 24th A night of rain and a) the oil is being washed away and b) the remaining oil is not encouraging puddling, the canvas 'looks' wet. So maybe the oiling was a bit of a questionable action

See next page for detail on issues of
a) Use: Permeability to light and rain, Strength and Durability
b) Manufacturing and
c) Disposal.

Info on synthetics :: Page 3

Pages: 1· 2· 3

Geodesic domes commonly built of triangle that have are built with various different size triangles. The simplest, more suited to smaller domes, uses 30 isosceles triangles. The sides of which can be calculated below for a given final dome diameter. Check out geo-dome.co.uk

The 2 strut dome is made of six pentagons each of five triangles as shown highlighted in the image. The clear spaces are those formed when the pentagons are 'pulled' together

 

The individual triangles are all the same size.
Ratio of struts A :: B is 1 :: 1.13

All the triangles are the same and five are used to make each pentagon as shown in the adjacent image.

To calculate struts for other dome widths use the calculator below, but note that larger versions needing longer struts will have to use substantially more robust struts and the covering will also have to match.

All links below open a new tab
2 strut and 3 strutwith connection numbers  | Building Guidlines
For details on wind loading and more:- geo-dome.co.uk
View or download geodesic.pdf by geometer.org

The two piece design consisting of a circular lattice wall (kana), commonly some 4 to 5 feet high, to surround an area some16 feet across, with a sloping radial roof.

The kana's length will be the circumference of a circle who's width is know. The kana is usually made of section for convenience or handling and storage.

The parameters in constructing a kana are dependent upon the spacing which in turn is dependent upon the strength of individual slats.

The formulae below shoes the relativity of the horizontal length of the kana, which is a multiple of B relative to the distance between the cross-over distance in each strut (A)

If (A = 30cm)

B^{^2} = A^{^2} + A^{^2} = (a x a + a x a) = a(a + a) = a x 2a = 2a²

B = √ ( 2a²) = √2 x √a² = √2 x a = 1.414a

Then (B = 30 *2^{^ 0.5} = 30 x 1.414 = 42.42cm

A yurt with a 4 metre diameter (approx 13.5ft.) will need a kana of 4 x Pi = 4 x 3.14159 = 12.6 Metres. (circumference)

42.42 x 30 = 12.726 :: close to 12.6 Metres needs 2 x 30 or 60 poles at some length.

Height = 1^{^ 0.5} x (length of battens) i.e. .707 x (length of battens)
Tableof Tie Distances and Batten length to give approximate height and diameter of erected kana.