1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Stone Capping Not Adhering To Mortar?

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

  1. Foresty Forest

    Foresty Forest

    Joined:
    14 Jan 2020
    Messages:
    150
    Thanks Received:
    2
    Country:
    United Kingdom
    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]
     
  2. Sponsored Links
  3. ^woody^

    ^woody^

    Joined:
    3 Sep 2006
    Messages:
    33,999
    Thanks Received:
    4,615
    Location:
    West Mids
    Country:
    United Kingdom
    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.
     
    • Like Like x 1
  4. catlad

    catlad

    Joined:
    29 Jul 2011
    Messages:
    4,912
    Thanks Received:
    743
    Location:
    Lancashire
    Country:
    United Kingdom
    A slurry mix on the stone to be layed will help bonding.
     
    • Thanks Thanks x 1
  5. mrrusty

    mrrusty

    Joined:
    1 May 2018
    Messages:
    737
    Thanks Received:
    147
    Country:
    United Kingdom
    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.
     
    • Thanks Thanks x 1
  6. Sponsored Links
  7. Foresty Forest

    Foresty Forest

    Joined:
    14 Jan 2020
    Messages:
    150
    Thanks Received:
    2
    Country:
    United Kingdom
    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

    Joined:
    7 Jan 2011
    Messages:
    1,235
    Thanks Received:
    137
    Location:
    Warwickshire
    Country:
    United Kingdom
    Mix pure cement with enough water to make a consistency like double cream. SBR can also be added.
     
  9. Foresty Forest

    Foresty Forest

    Joined:
    14 Jan 2020
    Messages:
    150
    Thanks Received:
    2
    Country:
    United Kingdom
    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

    Joined:
    5 Aug 2008
    Messages:
    591
    Thanks Received:
    53
    Location:
    Gloucestershire
    Country:
    United Kingdom
    I would use powdered tile adhesive but not ready mixed.
     
    • Thanks Thanks x 1
Loading...

Share This Page