This module will look at step five. This is a phenomenon which occurs when the air in the roof space is excessively high when compared to ambient. This may be due to solar or space heating of this area and may cause the smoke to stop rising before it reaches the extract point. Stratification occurs early in the fire development due to the smoke losing its buoyancy relative to its warmer surroundings  

  We now want you to carry out exercises 38-43 and then view the model answers below.   Exercise 38

Exercise 39

Exercise 40

Exercise 41

Exercise 42

Exercise 43