We don't use anything on our floor as you said they are not on it anyway.Our floor tends to flood in the center where there is no coops-we have all of the mini coops built up on the outside walls of the barn and the free rangers roost in the center..after you remove a foot of soggy wet muddy shavings once you don't do it twice and with 2 pretty big rains..the May flood and another 10" just a week ago the last thing we need or want is shavings down.When it's not flooding we have no problem keeping the bare floor clean and clear of bird poo and it goes in the garden without adding the acidity of wood shavings...plus the cost savings of covering the floor with shavings is huge..it would take a few pickup loads of shavings just to get a small covering on my floor nothing to say about several inches.