I have seen a lot of information regarding a wire mesh over the chicken run but can't see anything about info on a wooden roof on the actual "hen house" or coop where nests are. Does the actual hen house need a wooden, insulated roof? Our chickens are at a great little coop but there is only wire mesh on top and then a fiberglass overhang over the mesh (the fiberglass is not sealed on to the coop itself). Do they need a completely enclosed house to keep them from extreme cold and extreme heat? They also have part of the coop (a run) that is just enclosed with wire (and the fiberglass overhang). We are in northern California and weather is getting colder. Thanks.