i was eyeballing my empty garage, (not really empty, full of junk but not being used as a garage) and was thinking it would be a great place to set up some breeder pens for safe, dry, secure housing for the winter. i was wondering if I put a few inches of dirt over the concrete to put the pens on, how deep would you put it? i was thinking about laying down a huge tarp under the dirt, in case anyone was wondering. Any thoughts or suggestions?