Another aspect associated with escape stairs is the method of “Phased evacuation”. "Where it is appropriate to do so, it may be advantageous to design stairs in high buildings based on phased evacuation. In phased evacuation the first people to be evacuated are all those of reduced mobility and those on the storeys most immediately affected by the fire, usually the floor of fire origin and the floor above. Subsequently, if there is a need to evacuate more people, it is done two floors at a time. It is a method which cannot be used in every type of building, and it depends on the provision (and maintenance) of certain supporting facilities such as fire alarms. It does enable narrower stairs to be incorporated than would be the case if simultaneous evacuation were used and has the practical advantage of reducing disruption in large buildings”.
©SHEilds – All rights reserved FC V 5 JUN 2021
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