A building storey may be indicate the elevation of the top surface of the floor slab, excluding any floor coverings. For storeys with raised or sunken areas, the elevation should reflect the largest area of the slab. For split-level buildings, each level should have it's own IfcBuildingStorey.
The following diagram shows the generic classes and relationships used when applying this concept.
In addition, concepts may have particular importance to common or standardised industry practices and scenarios. For these specific usage scenarios, the tables below shows a recommended list of general usage patterns that users may adopt.