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oh, how do you mean? It doesn't move.
We simply use a jumping jack to compact along the perimeter, a little base of pea gravel, then drystack the flagstone. I always try to use wider stone along the perimeter for stability, although most guys just use 4" strip.
The patio stone is also drystacked on a layer of roadbase and pea gravel.
This particular patio has seen snow, frost, torrential rain, and intense heat and is still standing strong.
Like I said though stone, I've been building these since I arrived in CO four years ago and have gone back to look at some of our work; still in good shape. The guy I worked four for about the past three years has been building them like this for a good 10-15 years +.
Nick
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