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Discuss Concrete screed crumble in the Tiling Forum at TilersForums; Hi, i laid a new concrete floor and laid the screed on Thursday, i went back today and found the screed to be like crumble towards the end we laid ...
          
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    New TilersForums Contributor Steve A's Avatar
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    Default Concrete screed crumble

    Hi, i laid a new concrete floor and laid the screed on Thursday, i went back today and found the screed to be like crumble towards the end we laid last. It was delivered quite dry and by the time we had finished seemed even worse but it trowelled up o.k. so i thought it would go off.
    Is there anything i could spray on it at this stage to harden it off or is it a case of taking it up again (i hope not). regards Steve.

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    Default Re: Concrete screed crumble

    Sounds like a bad batch.
    You should always grab a hand full and squeeze into a ball. If it holds its form when you pass it from one hand to the other its fine. If it breaks up, crumbles etc you need to get onto the batcher and complain to the rep. They will come out at their expense and remove the tipped product.
    There's nothing i know of that you can spray to harden it. The curing process has already begun, and if its crumbling it will never bond together.
    As it is already laid you could get onto the rep who will take a sample for analysis in their labs.
    Let me khow how you get on.

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    Default Re: Concrete screed crumble

    How thick is it..?

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    Default Re: Concrete screed crumble

    I think it just may have been too dry as the last bit i laid was the worst. It was about 50mm thick which i know is a little thin but i primed the surface with sbr and cement. I have seen floor hardener for concrete floors but i think they are applied whilst the screed is still wet? regards Steve
    Last edited by Steve A; 11-04-2009 at 08:50 PM.

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    Default Re: Concrete screed crumble

    It looks like your gonna have to replace the screed from what you have said
    Also the minnimal depth for screed is 65mm ,so it might all have weakened at some point anyway, can you replace and go to the correct level ?
    How long of a drying period you leave the concrete to set as well every
    xmm depth = 1day

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    Default Re: Concrete screed crumble

    Monolithic: to a clean, green concrete base @ 25mm thick min
    Bonded: to a clean, wet, grouted sub-floor @40mm min
    Unbonded: to a sheeted sub-floor @ 50mm min
    Unbonded with heating cables: 65mm min
    "Experience is simply the name we give our mistakes"

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    Default Re: Concrete screed crumble

    Hi Steve We do a lot of mudwork and I agree with the rest that there is nothing that can be done now other that to tear it out.

    One thing that we do to help deal with the premature drying out that you are describing is that we spray the mud with garden sprayer once it's floated and then cover it with roofing paper or plastic to hold the moisture in and enhance the cure.

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    Default Re: Concrete screed crumble

    The only thing you might try is sbr with water 1-5 and pour onto the screed, when it soaks in do again and until it feels enough has been taken in. Try to break the finished surface so you have opened the screed trowelled surface
    Last edited by whitebeam; 11-04-2009 at 11:32 PM.
    "Experience is simply the name we give our mistakes"

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    Default Re: Concrete screed crumble

    hi is the finish just dusty or can you scrape right through,,,,,,,,,,,,,

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    Default Re: Concrete screed crumble

    It can be scraped through in a few places. I was wondering if it was worth trying one of those dustproofing/hardening liquids and spraying it on? regards Steve

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    Default Re: Concrete screed crumble

    I think i will try sbr as it seems to stick everything together so its worth a try i think. regards Steve

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    Default Re: Concrete screed crumble

    It may be to late for the hardening liquids which should be applied at the mixing stage, dustproofing is ok a dusty surface but your screed will be weak all the way through. Try the sbr method
    "Experience is simply the name we give our mistakes"

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    Default Re: Concrete screed crumble

    hi sounds not to good if it was mine i would remove the loose stuff and re render or patch render with render (nothing seems to take to dust or weak subs) sorry

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    Default Re: Concrete screed crumble

    All screeds were 2 inches thick (50mm) years ago, no problems.
    Lucius.

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    Default Re: Concrete screed crumble

    prob pay to check floor is not drummie if you lay it to dry sometimes it wont take

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