I've got a job coming up that has 20 - 160 sq. ft. patios to install in 18"x18" slabs. The plan gives us the option of 1/8"-1/4" crush base or using a pedestal system. The patios are all on suspended slab over underground parking. I must admit, I've never used a pedestal system before. Can anyone speak as to what would be more efficient? I've used crush and "pea gravel" under pavers and slabs, laid on a concrete base but never pedestals? Anyone have any thoughts or suggestions?