Concrete dust between flagstone for stability?

peel(z6 CT)August 1, 2005

I don't know if I heard this correctly, but I thought someone had told me a long time ago that you can brush concrete dust (or maybe a mixture of concrete with sand) into the spaces between flagstone and wet it down to give it a little bit of stability when dry laying stones. Is this possible?

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The stability of a stone installation comes from what is UNDER them, not between them.

If the stones shift, the sand/cement mix cracks and falls apart. If frost gets into the cracks, the mix crumbles and falls apart ...

Laying them on a properly prepared bed of gravel and sand, compacted before the stones hit, then brushing plain sand into the cracks gives the area the best chance of surviving winters.

    Bookmark   August 6, 2005 at 11:55AM
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I didn't pose the question, but thanks, lazygardens. I'm laying a path with scrap granite from a countertop place, and I was thinking about concrete or mortar, mainly because of dreaded bermuda grass. You were a big help to me!

    Bookmark   August 21, 2005 at 11:20PM
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Do a search for Envirobond or organic binder (stay away from polamer) there are plenty of products that will bind the joints - but as Lazygardens states the base prep is the
main priority

    Bookmark   August 22, 2005 at 4:34PM
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