Newly laid Indian sandstone patio with markings appearing?

Discussion in 'Landscaping and Outdoors' started by ShaunP, Aug 28, 2020.

  1. ShaunP

    ShaunP New Member


    I’ve recently had a sandstone patio laid on compacted type 1 with wet bed by a landscaper. The last few days white marking is appearing on the slabs, if the slab is wet, these marks appear back really quickly, has anyone any idea what they are, what caused them and if they can be removed?



    Attached Files:

  2. Astramax

    Astramax Super Member

    A few posts on here suffering the same problems, use the search box to find the other posts.
  3. ShaunP

    ShaunP New Member

    Thanks, one of the slabs cracked so it was lifted, is this what a full bed of mortar should look like?

    Attached Files:

  4. masterdiy

    masterdiy Screwfix Select

    I think the Black is some kind of mould.
    Seen it many times on a lot of paving slabs.

    I jet washed a patio for a friend, but it came back a few weeks later.
    Maybe the slabs need sealing?
    Personally I five dot the mortar, that way it gives more movement when setting the slab down.

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