Most picket fences are constructed with the gap between the palings of 50 per cent of the paling width.
Therefore with an 80 mm paling the gap would be 40 mm – total 120 mm
To decide on how many palings will be required measure the total length of the proposed fence and divide that by 120 mm.
Therefore a 6 m run of fence would require 50 palings
Decreasing the spacing to 31 mm would require 9 palings per metre
At a spacing of 45 mm would require 8 palings per metre
Increasing the spacing to 62 mm would require 7 palings per metre
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