My coop has a metal roof with one panel of opaque plastic sheeting to let in light during the day. In the inside there’s currently a layer of vapor barrier. It’s supposed to get down in the teens and even down to ten in the next few days and I’m nervous it won’t stay warm enough in there. The walls are all double insulated with radiant barrier and plastic sheeting but I wasn’t sure if I could add the radiant barrier to the roof as well. Is it ok to add it with the vapor barrier? Will it cause any problems? Right now it stays pretty much whatever temperature it is outside in there. I can’t figure out what more I can do to keep it warmer.