As the ground slopes, pillars are used to support a frame for a platform. The top soil below the platform is being removed now the support pillars are finished.
The primary reason for removing the soil is it's biological value for growing: secondly it removes habitat for rodents and other creatures alien to the wooden structure and thirdly it allows greater air flow to degrade the environment for fungal and bacterial growth that could precipitate decay.
It also allows for better access to the underside initially for fastening an underfloor to the joists and smoking the underneath for pest and fungus deterrent.
And last but not least storage room for tools, wood and *)&^.
The soil is used to regenerate trashed areas of the vegetable and fruit growing vicinity. Although much of the debris, plastic string, bags and fillers have been removed, some remains at depth and there is considerable concrete and metal debris. See http://calstock.org.uk/elf.php/2016/01/17/plum-pears-peach?page=2
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 first beam (northern most)
Page 4: Placing second beam (southern most)
Page 5: All beams in place.
Comment 1, below, has sources for hard wax and varnish. Carnauba wax seems to be the hardest. I bought 500g fromcornelissen.com
Using a double boiler I heated the carnauba wax and linseed oil. Comparing the end product tohumblebeeandme.com/quick-guide-carnauba-wax . . the mix was probably 1:8 wax to oil. I did directly heat the container for short periods to speed up the melting.
To apply I diluted 1 part of this soft wax with 2 parts turpentine and brushed it onthe three main beamsonce they were in situ.
- Flax tarpaulin £283.85
- Sand and cement for beam support. £60
- Sand and cement for beam support. July 2018£26
- Sand and cement for beam support. Oct/Nov 2018£32
- 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) + £21.24 (Carauba Wax)
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
Basic preparations of site and purchase of basic materials
- Clear site: Move tree, dig trench, collect stones and rocks
- Buy Preservatives
- Buy cement sand and gravel
- Buy Tarpaulin
- Buy 10mm copper rod for beam to pillar and joist to beam location pins (44 x 125mm = 5.5m) + 500mm earthing rod
- Buy wood for beams and treat with borax multiple times
- Build 3 pillars, mid one being 300mm long./Use beam and level to ensure P1 and P2 are horizontal and in the same plane before drilling 10mm holes for pins:
Mark out rectangle for other outer row of pillars
Continue with other outer row of pillars and ensure parallel at 4.75m
- 2nd Jan 2019 Bought carnauba wax
- Jan 6th 2019 Lay final beam
- Level and cement final beams/pyramids to pillars
- Buy wood for T&G for underfloor, Joists and battens and fastenings
- Finalise cabin design and order
- Treat T&G floor and joists with tar and oil etc.
- Buy cork ????
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
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