we add a layer of DE and shavings about once a weeks when we stir the littler. In a yr we havent even gone though a 50 pound bag of DE...little goes a long way!! (we have close to 30 chickens in the one coop) And its on a wood floor.....no rodent problems....but I really dont think there would be anyway for a rodent to get into the coop unless during the day when the doors are open, and I think Nikki (our rooster) would just eat them!!! LOL
~Tiff~
~Tiff~