Inside the coop, I am using pine wood chips, add a bit of cedar chips, both purchased at
Tractor Supply, inside the coop on the floor and their egg laying spots. I guess I have it about 5 inches thick but of course I fluff it up and then the chickens are always fluffing it up. My coop has a plywood floor that painted with polyurethane. I'm reading more, learning, and thinking of adding PDZ. I see that the Deep Litter way is usually meant for coops with dirt floors, but it works pretty good in my wooden floor coop, no odors or big messes. I also found that this is all relative to how many chickens you have per square foot, because when I rescued a dozen chickens a few months ago, I quickly found out that more chickens means more poo and more humidity, so if you find that you have wet or stinky litter, then you have too many chickens in that particular space. I now have the rescues in a larger shed, a former pigeon loft, but will be building them a new 12x24 coop in March, or when the snow clears. For my little coop, 4 hens and 1 ornery rooster work just fine, it stays pretty dry for the most part. The food is hanging from the ceiling, the water is elevated on bricks, they work better than the small pallets I tried before as bricks aren't going anywhere unless I move them. Cleaning is no big deal, I take 5 minutes and bring the 5 gallon poo bucket and a scooper, (actually bought a child's mini snow shovel at Lowe's for my pooper scooper), and the poo kind of clumps up easy in the wood chips, think of a golf ball sized coconut macaroon, and then the bucket of macaroon poo's will be taken to my compost heap and tilled in. I have 3 compost heaps at the furthest point of the lot, they're based on age, and I rototill them all, but the oldest heap (2 yrs old) will be used for this Spring's veggie garden. I have compost of veggie peels, Homing Pigeon poo and my Chicken's poo, with the wood chips, and as it is tilled and ages, it becomes the richest soil that produces the best garden veggies, it's a win win.
I do let my chickens free range when I am outside gardening, but we have so many predators here (hawks, falcon, raccoon, fox, coyote), we built protected outdoor pens, 10x20 and 10x15, dug 2 feet down since we have digging foxes, skunks, opossums, etc. Trying to keep clover or anything green growing in a protected area is impossible, even when you have 2 pens to rotate birds back and forth (yeah that was my bright idea, give 1 pen a chance to rest and grow, nope doesn't work so good, you just end up having 2 muddy pens). Anyway...I first tried the bales of straw/haw or whatever the
Tractor Supply sells, and spread it all out. At 1st it was fun, my Roo would scratch and pile it all up in a heap, then play king of the mountain, crowing loud and proud, and it was dry...until it rained, and rain it did, for days! Ugh, what a darn mess. Long story short, I had to get that crap outta there before I had a moldy mess make my birds sick. To top it off, there were these nasty weeds growing afterwards, and let me tell ya, they were AWFUL, and they were EVERYWHERE!!! I was pulling this stuff up, it was grass but it had a ball for a root, I was calling it BALLGRASS, and we suddenly seemed to be cursed with it, in the pens and then outside the pens, extending outwards, good grief it was spreading! I found out, it is a type of Sedge Grass, and it is impossible to get rid of, so I will be digging that crap out of the ground all around the coops and pens from now til doomsday. Wherever that darn straw/hay was harvested, must have also been infested with that dreadful weed. So, I unwittingly bought it, and brought it home! Oh, and even the chickens hate it, they won't touch it, I have to dig it out while they watch me, waiting for bugs. LOL
Now, outside in their pens, I have been using big wood bark chip, the plain wood pine bark, largest pieces you can get, not small shredded mulch, and definitely not treated with any dye or weed chemicals. The bugs hide under the big bark chips, much to the delight of my flock, so they're always scratching and kicking them around. They don't seem to break down too fast, and they prevent the pen from becoming a mud hole. So far, so good.
I'm still in the learning process, so if anyone would like to make any suggestions here, feel free, but so far, this is what has been working for us. I live in Delaware, we have hot, humid summers and cold, snowy winters. Hope this helps!