The pillars will be in two pieces, a) the base of some 20" (60cm) square rising to 8" (20cm) square and b) a preformed truncated pyramid of base 6" (150mm) sq; the top 4" (100mm) sq. with 100mm of copper rod protruding some 50mm.
Example: Pillar 1 Base
The mix is 1 bag sand, 1 shovel of OPC, 1 shovel of pea gravel, 1/2 shovel of hydrated lime.
All things considered with no levelling it seems reasonable, one of the small top, truncated pyramids was also fashioned.
Truncated Pyramid Top
Top 100mm square :: Height 100m :: Base 150mm square
Copper Rod of 100mm, 50 mm protruding from top
Given beam widths of 100mm the corner pins are:
length 6500-(2x50)mm or 6400mm | width 4800-(2x50) or 4700mm
diagonal is 7940.4mm (7940)
(6400 x 2350) diagonal is 5685.9mm (5686)
(3200 x 2350) diagonal is 3970.2mm. (3970)
Can do 3:4:5 or 5:12:13
It is easier using a camera so here are two images. It appears as though the hose on the first image is above the bricks upon which the pyramid stands, assuming the water reaches the top of each, which is doesn't. So will adjust.
Second pillar finished though levelling seeming accurate at setting, top now seems some 6mm higher. I have a continuing problem in that the water levels are inconsistent ?? Still 6mm over 6.4m is less than 0.1° slope. There are also slight level differences in the north~south vane. All these can be corrected either by grinding away the cement or using lead or copper shims once the beam has been fashioned to fit.
22nd August 7.4m larch beams (200x100) were awaiting my return. Apparently they were delivered earlier this morning.
On of them has quite a bit of sapwood so I'm going to plane that one down and then prepare it for use as the middle beam, away from rain and damp?
3rd Sept The main, longitudinal, beams have been planed and treatment is in progress. The beams are in order of laying from north to south. The topsides have been coloured with red-ochre stone and all have had three coats of borax; the middle beam has had 7 and the sappy side 8.
The beams have been cut to 6992mm. This was to remove rough ends, splits and some sapwood etc. I decided to make them the same length.
4th Sept All beams now treated with at least 6 applications of borax to the side and a dozen times to the ends. See also http://calstock.org.uk/index.php/cabin/preservatives?page=2
Page 2: Treatment of beams
Page 3: Placing beams (See also comment 1)
Wood type, Sizes, Sources
Wood type:Not using tanalised or commercially treated timber. (see comment 1)
Douglas Fir : likely candidate, Larch if possible
Ash: A mast yard treated with oil, has shown to last some 20 years, albeit under a cover (bender so not that dry).
- Beams: 7.4m 3 off (100x200) (5.226571ft3 each) £ 246.71
- Cover boards 2 off 3.6m and 2 off 3m (22x170)
- Cross beam flooring: T&G 51 off (4.8m 25 x 150) useable width -140mm £771+
- Joists @ 4.8m x 175
- 13 off 50 (47) £246+
- 4 off 100 £154+
- Insulation battens 64 off 2.4m x 25x25 £96+
Tavistock: Total Inc VAT £1714
Tavistock Woodlands: 832452 or 834383
All beams and floor will be soaked in borax solution before being tarred and oiled.
Oil: 1 Litre will cover 1 sq metre to a depth of 1mm, though wood's solidity may give 4 times that coverage. Calculations for cost do not account for absorption, so will see how my initial £640 purchase goes. See comment 1
External and base: Stockholm tar and linseed oil 3 coats min: turpentine for absorption on base and outer faces of walls. 1 coat with Linseed Oil too. (minimum on build, more to follow)
Internal and roof: 3 coats min of linseed oil 2 coats with turpentine primarily to dilute for absorption. See: http://calstock.org.uk/index.php/cabin/timber-for-base#c125
For info on commercial 'Teak Oil' see comment 4 & Flag Teak Oil
Borax: water based. Soak all timber.
The mode of action is not fully understood, but borates appear to disrupt the digestive process of the insect, causing it to starve. For fungi, borates are generally thought to work by preventing enzymic activity at the cellular level of the organism. A broad range of insects and fungi are inhibited by relatively low levels of sodium borate (approximately 0.2% by weight) in wood products. http://cwc.ca/wp-content/uploads/durabilitybytreatment-BorateTreatedWood.pdf
For supplier: see comment 2
See Page 2 for effect of borax
Pages: 1· 2
Plan is to lay three wooden girders on which to lay floor joists. As the ground slopes and I have no intention of levelling it, the girders will be supported on posts made from stone that has been salvaged from working the land previously.
Given beam thickness of 100mm the corner pins are 6400mm (length 6500-(2x50) | width-wise is 4750mm (width 4850-(2x50))
Used middle of beam with distance of 3200 and 4750 to get diagonal of 5,727.347
Given the cabin length of 6.5m the corner pins are at 6.4m (length 6500-(2x50) | width-wise is 4700mm (width 4800-(2x50))
(3200^2 + 4700^2)^0.5 Use middle of beam with distance of 3200 and centres of outer beams (4700) to get diagonal of 5685.9
Pages: 1· 2
- Flax tarpaulin £283.85
- Sand and cement for beam support. £60
- Sand and cement for beam support. July 2018£26
- 2 tape measures £32
- 180mm level £90
- 10mm copper rod for location pins £120
- 0.5mm copper sheeting for pillar isolation and base preservation £102
- Beams: ££ 246.71
- Underfloor T&G £800
- Fastening for T&G £100
- Preservatives for beams, base and topsides £640 (oils & turps) + £52(borax)
Fastenings for joists
- 4 off (100x150)mm from Tuai £160
- Travis Perkins (47 x 150)mm £22.08
- Tavistock Woodlands (2 x 6)" £17
- Timberclick (47 x 150) x14 £245 inc VAT and £48 delivery plus
4 of (75 x 150) Total £322.54
- 4 off (100x150)mm from Tuai £160
- battons and fastenings