Procedure for determining type of construction

In a building comprising multiple classifications, the type of construction applicable to the classification of the top storey applies to all the storeys below it. Figure C2D4a illustrates this. This method is used to determine the type of construction only, and not the FRLs required for the different classifications.

Figure C2D4a: Method of determining the type of construction required for multi-classified buildings

Where a Class 4 part comprises the top storey

To determine the type of construction required when a Class 4 part of a building occupies the whole of the top storey, the class of the next highest storey must be applied to the top storey (see C2D4(2)(a)). When a Class 4 part of a building occupies only part of the top storey, the required type of construction is determined by the class of the other part of the top storey (see C2D4(2)(b)).

C2D7 must be used to determine the appropriate FRLs for the building elementsin the Class 4 part of the building.

Examples

In a 3 storey buildingwith the lower2 storeys of Class 5 and the top storeyentirely of Class 4 the Class 5 classification would be applied to the top storey as shown in Figure C2D4(2). Thus the required type of construction by the use of Table C2D2 would be at least Type B construction.

Figure C2D4b: Multi-classified building for above example