Concrete sand vs. stone dust for flagstone patio
So I'm making a pretty big flagstone patio. 6" excavation, 3-4" fine gravel (probably should have used road base, but too late now). Now, do i put 2" of concrete sand or 1" stone dust under the pavers? There's a lot of discussion online about this. What do you use? We definitely have hard frost in the winter, and it gets wet beforehand. I'm concerned with the sand "washing out" over time, but will the stone dust cause buckling? The pavers are man made 2" colored concrete. Thanks!
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