We roll peat moss into ours to give is some softness/loftiness and it's BONE DRY. The sand was wet from when it was delivered and kept covered. After rolling peat moss in, it's actually a bit too dusty. The girls love to dust bathe in it.
Sand will always be our No. 1 choice for chicken bedding. I actually think wood products are among the worst unless you're going replace the whole floor or pick them out like a horse stall you will ALWAYS have wet material left behind.
Our chickens are worth the 10 minutes it takes to "kitty litter scoop" the sand every day.
Bantam Cochin, I would NOT want to be a chicken living in your coop. You let it sit so long that is "turns to dust"?! In the meantime, they are piling more and more fresh wet manure every day. Chicken manure doesn't dry up on contact with the wood shavings, it takes a whole day for the outside to dry and that's in arid dry weather.
Our animals live the way we'd want to live if we were in their place. That means sand as the bedding and it gets cleaned daily in the least, sometimes a second spiffing up in the evening. We owe them that much.