Grouting stone laid in sand

by Ken
(Salt Lake City, UT)

First, I purchased and watched your Flagstone video in preparation for laying my flagstone patio. Very helpful! Now my question.


Can flagstone that is laid in sand be grouted so that the joints will not crack? I have been advised by one professional that if one desires a flagstone patio with mortared joints that will best resist cracking, then I should lay the flagstone on a concrete foundation. His recommendation is based on the theory that stone laid in sand is more likely to move. Alternatively, and assuming I lay the stone in sand but wish to avoid creating sand-filled joints, is there a type of grout or joint filler that will will expand sufficiently to permanently hold the stone in place?

Thanks for your help.

Ken

Comments for Grouting stone laid in sand

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you can do it
by: David

Dear Mary,

Thanks for the compliment! I'm glad we could help out.

We've seen people grout the joints. If you make it fairly strong with Portland, it should last for several years.

It will crack, but some people don't mind that look and with a 40 year old pad, it may work out well.

There is also a product called polymeric sand that stabilizes when you put it in the joints. That could be the best option for you.

Great luck!

David


what if
by: Anonymous

what if your flagstone patio is 40 years old and very good shape,laid in sandand you are very tired of pulling greenery between the joints. Could you mortat or grout or something in ther to make a nice sweeping surface or am I truly dreaming. Luv your site. Please Help!!! mary

what if
by: Anonymous

what if your flagstone patio is 40 years old and very good shape,laid in sandand you are very tired of pulling greenery between the joints. Could you mortat or grout or something in ther to make a nice sweeping surface or am I truly dreaming. Luv your site. Please Help!!! mary

joint advice
by: David

Dear Ken,

Thanks for the comments on the video. That really makes my dad happy that he can use his knowledge to help people.

You are better off laying your stone in concrete if you want concrete joints. We've seen people lay stone in sand and fill it with concrete joints, but it will eventually crack.

We've seen colored breeze (crushed rock as a substitute for sand) that comes in different colors including gray. That might be something you could consider if you don't want to lay your stone on concrete. You can find that at most stoneyards.

Great luck with your project!

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