I have a question about pavers and base materials. Assuming I'm going to have a 4" base of compacted crushed stone and 1 1/2" of sand. How much material do I need per sq ft? What sort of factor would you use to estimate compaction of material? Would CR6 be the appropriate base material? What kind of sand should I use for the setting the pavers? Also, should I use the same kind of sand for brushing onto the pavers and how much of it as well? THANKS!