This is not the rinky dink Hollywood version. This one shows you about real backdrafts in buildings so full of heat and smoke, that you can't see your glove in front of your mask. More firefighters are killed outside a building than inside. Wall collapse is one of the main causes of these deaths. It always happens suddenly, but may be predicted if you know enough about it.
Most fires occur in residential buildings, and most residences have peaked roofs.
The different types of peaked roofs and their construction is discussed, with precautions and weaknesses covered. This video gives the whole story. Gives a careful analysis of famous floor collapse incidents. Details of different types of floor construction and their collapse potential, and floor collapse warning signals. Begins with a historic evaluation of wood frame construction, covers the four types, fire spread, kinds of collapse possible, and causes of collapse.