ive done dry brick over sand patios for years and they alway seem to get a low spot in a few years from setteling and need repair. simply lift them out and relevel and lay. i live in central north carolina and the ground is red clay and not subjected to severe cold temps for long periods.
this time, i was considering a base layer of 1-1/2 " tamped dry gravel mix concrete, and 1/2" sand over that to level. the thought is it would help stop the setteling i get over time by spreading the foot traffic load over a larger area, created by the hardened concrete. i know it will crack eventually but the movement would be hidden by the floating brick above.
has anyone ever done that with success?