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Stone Capping Not Adhering To Mortar?

Discussion in 'Building' started by Foresty Forest, 30 May 2021.

  1. Foresty Forest

    Foresty Forest

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    Most of these stone cappings were loose, so I relaid them all last year. But quite a lot of them are loose again. I think the pointing is all that's holding a lot in place.

    I used a bed of 6:1 (I think?) mortar , and was careful that it wasn't too dry or too wet. I also used mortar tone, about 40:1.

    Is this one of those things that's just tricky? Is there something I should have done differently? And is there a quick fix for the ones that are loose?


    [​IMG]
     
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  3. ^woody^

    ^woody^

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    It should be a 3:1 mix and the important thing is for the cappings to be squeezed down, slid or tapped into wet but not soaking mortar to form some suction and get a good bond.

    The joints should be put on the capping stone and compressed likewise, not put in afterwards.
     
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  4. catlad

    catlad

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    A slurry mix on the stone to be layed will help bonding.
     
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  5. mrrusty

    mrrusty

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    add some sbr to some cement to make a slurry. Paint the back of the copings. They won't shift then. wash off any splashes immediately or they'll set solid.
     
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  7. Foresty Forest

    Foresty Forest

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    Thanks. What's a slurry mix? And is this something I can use on the loose stones now?

    Btw. I did use 3:1 in the first place, so has anyone got an idea what went wrong? Is it that stone is just non-absorbent and repels mortar?
     
  8. mikeey84

    mikeey84

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    Mix pure cement with enough water to make a consistency like double cream. SBR can also be added.
     
  9. Foresty Forest

    Foresty Forest

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    I have some ready mix acrylic wall tile adhesive - would that work to quickly reattach the loose stones?

    Or would the slurry mix be a quick fix?
     
  10. bsr

    bsr

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    I would use powdered tile adhesive but not ready mixed.
     
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