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How deep should my deck post holes be?

Discussion in 'In the Garden' started by RyanW8, 9 Jul 2021.

  1. RyanW8

    RyanW8

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    I've read a lot online that deck posts should be a minimum of 750mm deep to be below the frost line to prevent movement in freeze/thaw cycles. I'm planning on using 2 bags of postcrete on each post but 750mm deep seems quite overkill to me. Is postcrete affected the same way as normal concrete when frozen?
     
  2. mikeey84

    mikeey84

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    That's more of an issue in the US, where frost heave occurs as it gets much colder than here in Blighty

    400mm should be fine, depending on ground conditions
     
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  4. RyanW8

    RyanW8

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    yeah I did think so. So far I’ve managed to get 300mm down but it seems there is solid rock below that so might just stick with 300mm. Spoke with my uncle who’s a builder and he said it’s plenty. Houses are built on 800m deep foundations so 300 is plenty
     
  5. mikeey84

    mikeey84

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    Sounds like a good plan
     
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