If I'm building a patio out of big flagstones, do I need to put down a layer of gravel or sand under the stones.

If I'm building a patio out of big flagstones, do I need to put down a layer of gravel or sand under the stones.
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Answer :

answer:Absolutely. It will help with drainage and also make it easier to get them level. Edit :: I should add that I helped my BIL do this a few times and he is a licensed contractor and electrician.
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