I have a web bought coop that has metal slide out trays for easy cleaning. I was wondering if I could use the deeletter method of shavings with this setup? Do you need to have it on a dirty floor? I don't know how important is is the the living organism be able to come up from the dirt into the beeding or if that is not necessary? I use wood shaving right now and was thinking that I would really like to be able to build up a think layer on the bottom to help keep the shickens warmer in the winter. They seem to move the shavings around a lot everyday and get it down to the metal in some places (huge piles in others). It also seems really dusty and I am worried about that for the lungs.