I have a dirt floor in my 8'x 16' coop. Currently I cover the floor with straw in ample amounts. I usually rake it out and replace it every few weeks during the summer months. I wont be able to do that during the winter after the snow starts flying. Deep litter is a method talked about but I know little about. Do I just keep adding more straw as it mats down during the winter months or do I need to do or add something else?