The roof can be a killer when you are on it, and it is certainly a killer if you never get there. Roofs of fire buildings tend to look a little crowded in today`s fireground pictures in fire magazines. I recall a disaster in my own department in which six firefighters were killed when a supermarket roof collapsed. One of the lessons driven home to us who cried for lessons in disasters was that more than six firefighters could have been killed! Many, many more (too many) firefighters were on tha