I have been using the shavings inside and the wood chips in the outside run. So...what I'm going to say works for wood shavings but may not work for the mix.
I found a couple of things. When I just left it alone like I do in spring/summer/fall, there is way too much poo in there since they spend most of their time inside. The poo freezes solid and if there is any moisture at all in the dirt (which there is) the whole mess began to freeze.
So...I started doing 2 things.
-As soon as the temps start to go down to about 25 I try to rake it all the way down to the floor to be sure things stay loose enough that the birds can scratch and turn it. Basically I'm just turning it to be sure it's loose. I do that in the morning.
Due to the restricted quarters, I bought a child-size garden rake with good construction from Menards. Use it all the time and it's short handle makes it easy to work with in a coop. Rake pole is about 3 ft. long or so.
http://www.menards.com/main/outdoor...ing-tools/kids-bow-rake/p-1495038-c-13241.htm After the temps go lower, it will stay separated without having to rake every day, but when it's warmer in there I have to keep it broken up.
-First thing in the morning (before doing the above) I started taking a wide shovel in and using it like a dust pan. Using the rake, I lightly rake the droppings from the prior night that are under the roost into the shovel. I do leave some, but I try to
skim off the predominance of them and toss them out. Then I do a quick deep raking as above to be sure things are loose. The birds will do the rest.
And I don't do this every day. But I do it enough to keep it from becoming a solid mass.