The stone slabs are varying from about 10mm up to 30mm.
They are natural riven stone from the quarry but cut to shape. (various rectangles and squares).
I am going to lay a riven stone floor on an existing concrete floor. The riven stones are various thicknesses and I have worked out a random pattern. I cannot decide what is best to lay them on. Dry mix, screed or cement.
Any views ?