The plan is to use 2'x2' bluestone pavers with up to 3" of space between the stones. This would be placed on a base of 6" of bluestone dust (as this has been more effective than natural screenings/fines at keeping ants from taking up residence).
I would love to have grass between the stones, but I'm concerned that the 2" deep won't be enough soil.
Is this enough soil for grass? What are some considerations to help ensure success? Is this a long term solution? Will the grass cause the stones to shift/lift over time?