We used 3/4 - 1 inch for a walk on type stuff. I would be cafefull of any
material of les than 1-2 inches without a good solid base. I would NOT
drive over Flagstone myself. Too Brittle for real driveways.. !!!!
"effi" wrote in message
...
for a patio what thickness shoudl be used, 2" or 4" ?

will 2" thickness be enough?

is the 4" mainly for areas that cars will be driven on?