I can understand the "antiseptic" nature of wood ash being
effective on keeping pests down - but why so little concern about the chickens' respiratory health for those advocating wood ash?
Humans don't like breathing wood smoke, and there is no dust in the world that is good for us to breath. I would think chickens would be even more sensitive to it given their amazing, but relatively "fragile" respiratory systems. In my admittedly noob opinion it seems that breathing in wood ash dust just CAN'T be good for them - regardless of how effective it is against mites or lice. That's one of the many reasons we don't use DE either.
This is our first winter with chickens. Like Aart we're just planning on using dry dirt in tubs when the area under the coop freezes.
Ask me in the spring how well it worked