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Limestone Slab patio on concrete uneven base

Discussion in 'In the Garden' started by thefurz, 19 Sep 2011.

  1. thefurz

    thefurz

    Joined:
    19 Sep 2011
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    Location:
    London
    Country:
    United Kingdom
    I want to lay some limestone slabs in my backgarden. The problem is that the base is concrete (it used to have a bomb shelter on it!) in most places with a small area of very old slabs. I am going to lay my new slabs on this base.

    I will lay the slabs in a mortar bed but how can I build up the existing base to make it level? I would guess that there is perhaps a 5cm (at the most) gap between the lowest points in the uneven base and where I would want the height to be at that point to give the correct level.

    5cm seems too small to build up with a crushed hardcore level and of course across most of the area the gap between the current base level and an even level that I can lay on is less than 5cm.

    A 5cm gap also seems too big to build up with coarse sand and have the mortar bed on top? Anyone have any ideas on how to build up such a relatively small gap? Thanks.
     
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