Base & Sub-floor DesignUpdated: April 7th, 2018
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
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1. 12 x 4.8m joists: 47 x 150
2. 2 x 4.8m joists: 100 x 150
3. 5 x 3.0m noggins: 47 x 75 (30 @ 500mm)
4. 1 x 80.0m battens: 25 x 35 to support cork
5. 4 x 3.6m covers: 25 x 150 (Outer edges of joists)
a) 3 x 7.2m
b) 6 x 3.6m
c) 3 x (4.8 + 2.4)m
With a) beams will have a copper pins at each pillar i.e. a total of nine with either b) or c) options there will be twelve pins.
With option c) positioning of 2.4 beam will be as follows, from inner end - in mm
100(25 + 50) for first location pin and 25 for the rest of the 50mm joist
2150 (500,50,500,50,500,50,500) to the outer joist/beam of
50mm out of cabin footprint.
For the lower floor that covers the 3 beams. If each plank has a useable width of 150mm it will require 48 planks to cover the 7.2m beams.
Each will be fastened by screws to each beam so 144 screws plus a possible 28 extra to fix to the overlying joists. 172 (200)
50mm x 4mm ??