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steel upright sit on dirt?

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  1. #1
    Senior Member
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    Apr 2015
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    Default steel upright sit on dirt?

    Hi There,

    Can steel H channels just sit on the ground as you pour the concrete around them?
    I see on install guides on the internet that you must have at least 100-200mm concrete under the post?
    Why is this? So the upright does not slip down into the soil? So it doesn't rust?

    Also would 350mm diameter upright holes be OK for a 1m high wall????
    The landscaper doesn't have a 450mm auger and said 350mm is ok.

    Thanks.

  2. #2
    Golden Member
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    Oct 2017
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    Melbourne - Yarra Ranges
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    Default

    Why is this? So the upright does not slip down into the soil? So it doesn't rust?
    ..All of the above and as per install guides, have always had them off the bottom.


    Also would 350mm diameter upright holes be OK for a 1m high wall
    Depends of the soil, slope and how deep the holes are. As an example, generally the holes should be as deep as they are high (minium) but may be deeper depending on the site.

  3. #3
    1K Club Member Pulse's Avatar
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    Default steel upright sit on dirt?

    They can probably sit on the ground, if they were loaded from above then maybe concrete under would be more important. They won’t rust much at depth due to lack of oxygen. The diameter is less important than the depth so 350 should be ok unless the engineer plans say otherwise.

  4. #4
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    Default

    Fantastic, thanks for the replies. Depth will be 1.1m and height is 1m so seems like all is good. Landscaper was only going to go 0.8 deep but told him to use 2.1m uprights as it's a 30 plus degree slope.

  5. #5
    Senior Member DEMAK Timber's Avatar
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    Default

    Sorry to jump on the end of this thread with a product promotion, but these brackets make it so much easier to set your UC's especially if you need to allow a footing underneath.

    https://www.demak.com.au/shop/steel/...fore-concrete/

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