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How to strengthen a sand cement screed?

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  1. #1
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    Default How to strengthen a sand cement screed?

    Hi all,

    I have just finished screeding the bathroom floor, 3:1 sharp sand and cement mix.

    Today I had a knock around with my knuckles and noticed in a two places a less than solid noise - indicating I probably didn't bat the sand down hard enough in those areas.....

    My question: Is there a product that I can apply to the 35mm screed that will enhance strength and help reduce potential of cracking, or do you think it will be OK as is?

    The floor tiles are 300mm square ceramic with square edges. Adhesive is the Dunlop (Ardex) jobby from Bunnings.

    Thanks in advance!

  2. #2
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    Impossible to tell without seeing, hearing and feeling.

    But, if you think it might cause problems, it's very easy to remoe a section and re-fill it.

    Just don't get any tools even near the waterproofing.

    Cut around the area with a grinder then chip out the offending spot/s. the material in contact with he waterproofing should solid enough, tap it to make sure.

    Good luck and fair winds.
    Growing old is compulsory, growing up is not.
    http://www.wet-seal.com.au/waterproofing/locations.html

  3. #3
    Community Moderator phild01's Avatar
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    I am wondering if the screed was too wet when laid and has curled.

  4. #4
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    Quote Originally Posted by phild01 View Post
    I am wondering if the screed was too wet when laid and has curled.
    could be the problem, also wonder if a concrete slurry was put down first?

  5. #5
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    Default How to strengthen a sand cement screed?

    I didn't put a slurry down first. Screed was solid as a rock but there were drummy spots. In the end I took it up and it came up soooo easily. Second time round it's suck good. That could be the issue

  6. #6
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    Thanks for the replies all. I layed the screed on top of the waterproofing. It's 40mm to 25mm in depth and has probably two or three not so solid sounding sections however the screed has gone off hard.I'm considering tiling on it and see how it goes? I didn't use a slurry.

  7. #7
    Community Moderator phild01's Avatar
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    Use an adhesive with some flex.

  8. #8
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    Quote Originally Posted by melvyn View Post
    Thanks for the replies all. I layed the screed on top of the waterproofing. I'm considering tiling on it and see how it goes? I didn't use a slurry.
    Best of luck with that , Did you reinforce with mesh?

  9. #9
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    Use epoxy patch from ramset.

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