height of arris rails

30 Mar 2015
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United Kingdom
I am installing a feather edge fence where the posts do not have cut outs and am wondering what height I should place the two arris rails at.
The "slats" are 4.5ft high and I have gravel boards at the bottom. Therefore the finished height will be 5ft.

Where should the lower and upper arris rails go?

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I would go for about 9'' down from the top of the boards and 9'' up from the bottom
Perfect. Thanks.
To be clear, that's 9 inch from the top of the gravel board as opposed to the ground?
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Its really just a matter of opinion. It has little bearing on strength but I prefer them quite near the ends as it stops the boards twisting at the top where they hang above the rail.
I've gone with 9inch. Will the capping help prevent the boards from twisting at top?

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