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limestone coping and render loose

Discussion in 'Building' started by mattu27, 9 Jun 2019.

  1. mattu27

    mattu27

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    Location:
    Nottinghamshire
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    We had a retaing wall built in the garden in 2015 out of 7N dense blocks on their side. I placed polythene behind the wall going down to the footings. This was followed by terram which I formed into a channel that was filled with about a foot deep and wide of pea gravel with a 4" land drain wrapped in a textile sock at the bottom of the pea gravel so plenty of drainage

    The wall was then rendered leaving an inch gap at the bottom and painted with masonry paint.

    Each year the sides of the wall on the steps gets damp and subsequently the render comes away at the top. I repair this every year and repaint and it's becoming a bit of a chore.

    Could it be that the wall is pulling damp up or is it that surface water is coming over the coping stones and getting behind the render somehow?

    It only seems to be the side walls and the lowest step on the patio that are affected.

    This also means that the coping stones are coming loose. I rebedded some of the top steps last year, I cut grooves in the stone and the concrete block of the step. Applied an SBR slurry to the bottom of the limestone and rebedded them on a full bed of mortar with frostproofer additive after wetting the concrete of the step. The mortar was solidly stuck to the steps but not the limestone.

    The last photo shows the damp blocks on the side that I haven't rebedded the copings on before. The wires are coming out.

    What am I doing wrong? What's the best practice for rebedding the limestone for a permanent fix on potentially damp concrete block?
     

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  3. mattu27

    mattu27

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    Anyone? Thanks
     
  4. mattu27

    mattu27

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