sand and concrete mix

Hans,
I just ordered your book and am looking forward to reading it. I am undertaking a flagstone project this year in my backyard where I will be covering some existing concrete patio and also laying flagstone or slate in dirt/previous yard. I live in the NW where we do get freezing and thawing cycles therefore I am going to be using the sand techique. Is it okay to lay flagstone over existing concrete using the sand technique or am I better off with hard mortar?
Does the book explain this clearly? Thanks

Marcus Torrey

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sand and concrete mix

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Sand over concrete
by: David

Hi Marcus,

I think you're referring to our DVD, because we don't sell a book.

You can use the sand technique over concrete, but it is a lot of work. My dad has never done it, but we saw a crew put tar over the concrete and then put in 4 or 5 inches of sand over that. It is a lot of work and then you'll have to pour in more sand on the area where there isn't any concrete. You also might make your patio too high.

We live in Denver and we get a lot of freezing and thawing and the stone stays stable for many years. The key is to use a good sealer after you are done laying.

You could have both flagstone in both concrete and sand side by side. We have a picture of that here:

http://www.the-flagstone-experts.com/ways-to-install-flagstone-patios.html

Also, talk to they stoneyard where you get your stone. They might have a solution that's right for your region and climate.

Great luck!!

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