I am having my landscaper put in a flagstone path along the side of my house and running up to my patio. I wanted to plant grass between the joints.

I noticed he put the sand right on top of the grass and then started laying the flagstone. I was expecting that the grass would have been excavated out and then the sand put on top. I am concerned that this will be a problem and unstable foundation. Also, now the path is higher than the ground so I cant really plant grass between the joints as I wanted.

Not really sure where to go from here. Any advise would be greatly appreciated.