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My gardener wants to set 4x4" treated wooden posts in the ground to support a 6' high wooden fence.

To stop rot and make it easier to change posts, would it be OK to concrete metal post spikes into ground instead or will they corrode/rust faster than the wood posts?

I live in a mild UK climate with little frost but wet winters (Cornwall) some wind exposure.

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  • I edited the question to be a little more clear, I hope. Please be sure that it's still asking what you intended to ask, and feel free to edit it again if I missed something. Also, your use of inches & feet contradicts your living in the UK... I know your speed limits are in MPH, and you buy beer by the pint, but milk by the litre, but aren't most distance measurements in cm/m? :)
    – FreeMan
    Jan 10 at 12:57
  • @FreeMan Might be the same us older Canadians. We first learnt imperial and then metric, some still more comfortable with imperial.
    – crip659
    Jan 10 at 13:22
  • Ah, forgive me, @crip659. I'm always forgetting our friends to the north. Really stuck my foot in it wishing folks a happy Boxing Day and forgetting you folk enjoy some post-Christmas pugilistic activities as well. :)
    – FreeMan
    Jan 10 at 13:26
  • No, those are practically mailbox posts. The literature likely states 4' high fence maximum or similar.
    – MonkeyZeus
    Jan 10 at 19:47

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4x4s with a treatment for in ground use should last longer and be sturdier than any metal spike that you would place a wood post on. The posts should outlast the fence sections.

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  • I had to replace the posts (but not the fence sections) on my place a few years ago. But I don't know for sure whether the old posts were PT that eventually leached out, or just cedar. Note that either way, packing the end grain with epoxy or something like that to reduce how much water gets wicked up into the post can significantly extend its life.
    – keshlam
    Feb 9 at 15:40

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