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Some folks call "rock dust" the same as others call "screenings". It is the fine particles that go through the crusher. It will pack quite hard if packed, good drainage, and fairly easy to clean. It is easy on the feet & joints too.
I spray mine with bleach to help with some insects, but primarily as a sanitizer, and keeps down any urine smell. In the summer, the hounds can dig a hole to lay in & stay cool, but all you have to do, is fill it back in, tamp it down good, and good as knew!
I would recommend it be a minimum of 8"-10" deep, & do put wire under it, & they cannot dig out. My kennels are about 14" deep, and I did them that way because it helps with drainage!
Good luck, whichever way you go.....gonna be some hard work, no matter what!