I have been reading about the deep litter method here. I am a bit confused as to what type of floor should be under the pine shavings. My coop has a plywood floor in it and I have a piece of 8' x 8' vinyl flooring that I planned on putting in when the snow melts. It seems that most deep litter users just have a dirt floor. Will dlm still work for me with flooring or does it need earth underneath for heat and drainage?