Sand set method is the most economical and allows for easy replacement, repair or adjustment of the pavers and should only be utilized with soil conditions that drain well and are stable against settling. Proper compaction of sand setting bed and road-grade gravel sub-bed is critical to prevent settling and movement For stability, the sand bed should not be thicker than 1” with joints of 1/16” to 1/8” and swept with sand. Use of a filter cloth is recommended on inclines.