April, 2016.LIST OF TABLESTable 1: Occupancy numbers(Approved Document B 2007)9Table 2: Width Of Escape Routes And Exit (Approved Document B 2007). 9Table 3: The Required Minimum widths of escape stairs (ADB, 2013). 10LIST OF FIGURES Figure 1: Figure 1: Refuge formed in a protected stairway (ADB, 2013). 13Figure 2: Classification of linings (ADB, 2013). 15Figure 3: Vehicle access to buildings (ADB, 2013). 23Figure 4: Vehicle access to route (ADB, 2013). 23Figure 5: Characteristics of occupancy A, Exemplar 2 (BS 9999, 2008). 30FloorTotal Occupancy Based On Floor Space FactorTotal Occupancy Shown On PlanBasement 107113Ground Floor378198First Floor203194Second Floor193184Third Floor 2421574.3.2 Travel DistanceBased on the guidance from ADB, travel distance depends on the number of occupancy, the purpose of this building as an assembly and recreation site as already mentioned classifies it under group 5.
The required travel distance is therefore 18 m if there is only 1 exit door and 45 m when there are 2 exit doors (Appendix B provides further information)4.3.3 Width of Escape Exits and RoutesThe recommended width of escape of exit doors are also dependent on the occupancy of each floors. Based on the guidelines of the ADB the table below gives an explanation of the required widths depending on the different numbers of occupancy.
Exit widths as indicated in the plan have to comply with these guidelines. Table 2: Width Of Escape Routes And Exit (Approved Document B 2007). Maximum number of personsMaximum door width (mm)607501108502201050More than 2205 per person4.3.4 Number of escape routes Similarly, the number of the exit doors required for efficient fire safety in a building, depends on the number of occupants that are present in each floor. The table below gives a recommendation of the number of exits doors against the number of occupants.
Maximum number of personsMaximum number of escape routes/exit doors6016002More than 6003Table 3: Number of escape routes (Approved Document B 2007). 4.3.5 Stairway WidthEscape stairs should have widths that are: Not less than the required widths of exits that lead into themIn agreement with the provisions of the ADB guidelinesNot greater than 1400mm if their vertical extent exceeds 30m with exceptions only in instances when there is a central handrailEqual in width throughout the staircases through the final exit doorsThe table below gives an illustration of these required minimum widths for escape stairs. Table 3: The Required Minimum widths of escape stairs (ADB, 2013). It is also important to note that there is need for a consideration to be made in incidences of emergency as the escape stairs have to be wide enough to accommodate the occupants in the building in specific floors for effective and timely evacuation to places of safety.
4.3.6 Evacuation liftGenerally, the lifts in buildings are advised against being used in incidences of fire as there is always the risk of occupants being trapped inside when electricity supply is shut down as a security measure to control fire spread.
Building management can however in special cases provide for the use of lifts as an evacuation plan, in such cases the lift installation should be in a protected and suitable location. It may additionally require the need for safety features aimed at ensuring the stability of the lift for use in evacuation. The document BS 5588-8:1999 provides adequate guidance for this particular provision of the design and use of evacuation lifts.
In cases where there is a lift provided for use by fire fighters, guidelines from document B5 can be used. This requirement should also be part of the plan by management to evacuate disabled persons. It is necessary that all emergency plans have a provision for the firefighting lift to be used when the rescue team arrived (BS 5588, 1999).