I know that there are breathing issues with Ag Lime, and I'd be hesitant to use it in the chicken coop. I use it in my barn and on my manure pile and it's very effective at keep down the flie population. I used the peel and stick tiles in my coop, over 4X8 sheets of OSB board, very inexpensive. I just bought whatever boxes they had on sale and then I stapled them down so I don't get loose edges. Then I toss about 1/2 bag of pine shavings ( I just use the extra fine ones that I buy for the horses) and bed fairly lightly and clean out once a week. I haven't used deep bedding for fear of making the young chooks spraddled.