Fence Posts Bolted To Retaining Wall

Discussion in 'Wood / Woodwork / Carpentry' started by dannymassive, 12 May 2020.

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  1. dannymassive

    dannymassive

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    Hi Guys,
    I want to attach a new fence to a new block retaining wall (blocks laid flat). The wall is 70 cm tall and therefore the posts would be bolted to the wall to the full height of 70cm. Would this be sufficient to support a 1.65 metre tall feather board fence on top? I would be using thunderbolts to attach the fence posts (4x4) to the wall face.
    Thanks in advance!
     

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  3. bernardgreen

    bernardgreen

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    You need to consider the increase in wind force created by the fence.

    This extra force will act horizontally and may, in strong winds, be enough to topple the wall.
     
  4. Tigercubrider

    Tigercubrider

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    Could you use a hit and miss fence? Or trellis type ?
     
  5. JohnD

    JohnD

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    No.
     
  6. dannymassive

    dannymassive

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    The fence will only be for privacy so providing this is achievable then yes. does hit and miss not leave gaps between so people could see through though?
     
  7. dannymassive

    dannymassive

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    I should also ask then, if it is not suitable, what other options do I have? I can not dig down below the wall as the 9 inch thick footings are 20cm below ground so could dig a hole to not cement posts. All ideas appreciated
     
  8. dannymassive

    dannymassive

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    Oh the irony! Have just googled it and the picture I used to describe the fence posts on the wall is actually hit and miss - I didn't even notice! So, yes, I could use Hit & Miss although wouldn't that be heavier than a feather board fence?
     
  9. JohnD

    JohnD

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    you could drill into the footings and insert a spike or bolts.

    But consider the leverage of an 8-foot post. If you wanted to wrench some bolts out, or push a wall over, a long lever is just exactly the tool you'd choose.

    looking on the bright side, after the fence has pushed the wall over, you'll only need to clear away the rubble before rebuilding.
     
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  11. foxhole

    foxhole

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    Total height would breach most planning regs for perimeter fence.
     
  12. Tigercubrider

    Tigercubrider

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    Hit and miss can be peered through but not casually looked through.
    Are you nude sunbathing?

    Most hit and miss are sturdy but could be made with lightweight material.
    Have you. Thought about screening material?

    https://www.ebay.co.uk/i/2541792803...GgpaXw7llomKGVCWaV1k0Yig6ExAkUVBoCgv4QAvD_BwE

    Maybe a stupid idea but you might be able to mitigate wind damage by introducing a weak point in the verticals, so something gives before the wall falls over.
    Posts in the ground and independant of the wall would save a rebuild.
     
  13. JohnD

    JohnD

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    Hedge.
     
  14. dannymassive

    dannymassive

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    Definitely not nude sunbathing!!! Am definitely open to the hit and miss, I only initially swayed towards feather board as that is what most of the neighbours have put up.

    I'm currently unavailable to see how they have affixed their posts due to the drop on the other side of the wall.
     
  15. dannymassive

    dannymassive

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    Hedge would be too much maintenance for me and as it's only a small garden would take up too much space width wise.
     
  16. JobAndKnock

    JobAndKnock

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    Hit and miss allows wind to pass through albeit much slowed, and withstands high winds far better than solid fencing wit minimal maintenance. Locally I have a 6ft high hit and miss fence that I installed nearly 20 years back - it faces down a small valley into the teeth of the winter gales (which here in the Pennines can often reach 60 to 70mph) but to date it hasn't failed, despite successive owners of the house doing zero maintenance on it in so far as I can see
     
  17. DIYnot Local

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