Hope someone can give me information....as you can see on photo my new Jotul stove is finally in situ "hooray" I am going to replace the oak beam that goes across thge top of the inglenook which is just for show (you can just see screwholes) it is only an inch thick and hangs down past the lintel about 3 inches which I am thinking might trap the heat.......question is.....when I replace the oak beam should I leave a gap with washers so that the heat can go between the wall and beam? or will it just be a waste of time....thanks folks.