DL should work, but why have a floor in your coop? The only reason that I can think of is if you have poor drainage and need to get the birds up out of a wet area. If that is the case you should try and find a new location, if possible. IMO, it is better to stay in contact with the good sweet earth. Also, having a floor might create a great space (under the floor) for snakes, rats and others to hide in.DL will work anywhere. Even on a wood floor.