Hi Kathleen, this is Peggy. I hope this information helps you build your slate patio. Good luck Build a Slate Patio in 5 Steps | DoItYourself.com
These steps will show you how to build a cost-effective slate patio using square slate and no ... Drag the plank of wood over the form to smooth out the sand.
If you’d like to do is slate patio all you would have to dig down about 6 inches put some P gravel down first then some sand over that and then place the slate into the sand so that it sits without moving and then after that I would put sand .you would put sand around to place it in between the slate with the broom to set it then hose it to set sand
Slate & Flagstone are porous & sometimes spall (flake) over time. I would look into UV stable sealers.
I would make sure that the final slope is at least 2%, but I’d go 4% in my climate.