Sand or stone dust under bluestone? | LawnSite
Jan 13, 2005· I am a landscape contractor who has been asked to redo a bluestone walk that has failed. It buckled, and many of the stones are actually cracked. It is in NH, where the winters are long and cold. I thought maybe that the base wasn't done right, but we lifted a few stones, and found ~8" of gravel under 3"+ of stone dust.