The choice of stone dust for our front walkway has proven to be suboptimal. It becomes soft when wet and is easily deformed by Nico’s crutch tips. Wet or dry, the stone dust gets tracked into the house, and it is not very easily cleared with a snowblower in the winter. We have decided to have a bluestone walkway installed over the top. I was asked by one of the contractors bidding on the job to evaluate the thickness of the substrate, leading me to do a small excavation, revealing six inches of stone dust over compacted clay. I have yet to hear back if this will be adequate to build on or if we will have to excavate and fill with a thicker base.