I am looking to redo my chickens run enclosure. I think of using construction sand/gravel mix on dirt. I thought Limestone with dust might be too hard on the bird's feet. They do get free range time weekly. I have used the deep compost way but leaves my bird too wet after rain. My coops are part shade area with trees but after a rain, it's mud center. I have tried leaves, wood chips, and straw which gives me a great compost and muddy chickens! Any thoughts?