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Concrete garage floor hole

Discussion in 'Building' started by beege, 17 Jul 2019.

  1. beege

    beege

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    Evening all, hope this is in the right forum.

    I’m hoping someone could give me some advice on my garage floor. It’s a concrete floor but near the door there is a dip in the concrete. When it rains the water runs under the door and collects in the dip.
    What’s the best way of filling it in to avoid this happening (not bothered about it looking great). I’ve read something about epoxy mortar; would this be suitable?

    Apologies the photos aren’t the clearest.

    Thanks in advance
    Beege
     

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  3. Nozzle

    Nozzle

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    Self levelling compound

    Nozzle
     
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  4. Harry Bloomfield

    Harry Bloomfield

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    It looks as if the concrete base has completely broken up there, so levelling compound on such a poor surface would also break up. It needs to be dug out to 3" and filled with concrete to level.
     
  5. beege

    beege

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    Thanks Harry, is this something that could be attempted by a DIYer that’s never done anything like this before?
     
  6. Harry Bloomfield

    Harry Bloomfield

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    Yes, just carefully dig it out so as to minimise disturbing the parts you will not be relaying, then mix up some concrete and drop it in the hole. By volume use a small bucket - 1x cement, 3x sharp sand, 3x aggregate (pebbles). Mix well, then add water and mix thoroughly again.

    Too be honest, judging by the bit of floor I can see, it looks as if someone has maybe botched that entire concrete slab. If that is the case, it might be worth your considering relaying the entire slab properly.
     
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  8. beege

    beege

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    Thanks for this Harry,

    Sorry to ask a really simple question but how do I dig out the old concrete?

    Also would I need to get a mixer paddle or could it be mixed by hand?

    With regards to replacing the entire slab, it is a solid concrete floor.

    Thanks again
    Beege
     
  9. Harry Bloomfield

    Harry Bloomfield

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    For what appears to be just that small hole, where it looks like soil at the bottom - you could just scrape it out with a garden spade, removing all the loose stuff around the edges back to solid concrete. You could mix the concrete up with the same spade, by hand, shovel it in, tamp it down. then level it by scraping with a straight bit of wood, using the existing concrete as your guide.

    If its old but firm concrete at the bottom of the hole, just clean it out of all loose and add new cement or concrete to the top up to level
     
    Last edited: 19 Jul 2019
  10. beege

    beege

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    Thank you so much for this info, I’ll give it a go :)
     
  11. bobasd

    bobasd

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    you might be wasting your time?

    what do you intend to do about any water entering the garage in the first place?
    the thin spreads of whatever it is - probably sand and cement - is perishing.
    has this "mortar" mix been installed over packed soil?

    why not thoroughly clean off the patch and pic and post it again?
    and why not examine the whole floor looking for cracks or signs of damp?
     
  12. bernardgreen

    bernardgreen

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    Is that a pipe coming up through the concrete ? If it is a pipe then what is it ?, if water it could be leaking and affecting the soil under the concrete.
     
  13. DIYnot Local

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