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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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General: Digging up floor, does it need to be underpinned?

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    Posted recently about digging up a victorian floor.
    We've dug some small holes to investigate the depth/extent of the foundations.
    Was intending on digging down 250mm, which is approximately where the foundations end. If we don't actually dig below the foundation, so that they are still supported vertically do they need to be underpinned? Or is there a risk of lateral movement?

    Any advice appreciated.
    Thanks
    • CommentAuthortony
    • CommentTimeOct 16th 2017
     
    No risk unless heavy shrinkable clay, best not dig below bottom of them or if you do leave 45 degree line from bottom corner outwards and down alone.

    You will be ok is the real situiation
    • CommentAuthorgyrogear
    • CommentTimeOct 16th 2017
     
    Posted By: tonyYou will be ok in the real situiation


    +1

    provided you don't expose too much cut at a given time, you can actually dig a staggered series of pits that you fill with dense concrete. The thing to avoid, is to have your footings (if any...) sitting for long periods on load-bearing soil of different bearing capacity. I am currently doing this in busted schist, you get less stressed as time goes by...
    Still, bear in mind that you just "might" be playing with fire... It all depends on how much you are wedded to you project. One thing is for sure, if things go wrong, your insurance company will not give a toss, you will be on your OWN !

    good luck, stay safe,

    gg

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