I have two coops, one with a cement floor and the other with a plywood floor, I use pine shavings in both, about two inches or a little deeper. They are 12 x 20 feet and 10 x 14 feet in size, the larger coop with the cement floor has 21 birds, my just started laying flock in it. The other has 59 little Banty birds, seven weeks old now. I have been changing the shavings about every month or so. I like clean, dry coops without smell. I do a quick morning pickup in the hens coop and nothing for my Bantys, they are still too small to make much of a mess. I do use a fair amount of scratch, to employ the birds to keep the shavings turned for me. A couple of times a year I run an air hose out to the coops and also do a blow out with air, to get the dust off the walls and floors. When I can see the cobwebs in a coop, a good blow out is soon to follow.
Best to you and your birds,
RJ