At my old place I used the deep litter method. When ever the manure build up was such that the birds weren't keeping it scratched into the litter any more I'd fork in another wheelbarrow load or two of leaves and stuff that I'd rake up from the property. A couple of times a year when I needed it I'd fork it all out to spread on the garden then start the process over again. I always kept at least several inches of organic material on the floor which was just dirt underneath. Worked well for me.
.....Alan.
.....Alan.