Repairing loosen flagstone joint cracks – Polymeric Sand VS Mortar VS Envirobond?

Discussion in 'Bricks, Masonry and Concrete' started by phil_edwards123, Jul 25, 2016.

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  1. Jul 25, 2016 #1

    phil_edwards123

    phil_edwards123

    phil_edwards123

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    Recently seeing cracks in the flagstone joints and the stones are starting to loosen up.

    I would like to repair the joint cracks before they all fall apart. How can I tell what kind of original joint material was it? I noticed a few ant sand hills amongst the cracks and so I figured it was polymeric sand.

    Do I need to remove all the old existing joints before putting new joints? Or can I just patch up the cracks by putting another layer on top of it?

    And what’s the best material for this kind of repair? Polymeric sand? Mortar? Cement? Or Envirobond?

    I’ll pose a couple of pics.

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  2. Jul 26, 2016 #2

    slownsteady

    slownsteady

    slownsteady

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    Looks like the slate was laid in cement. The pix aren't close enough for me to pick up any detail about sand. Polymeric sand is not intended to be used under the stone. It is not a substitute for a bond. It is best used in between pavers instead of traditional sand. probably not applicable to anything I see in the pix.
     

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