EMA-013: IFC model must not include gross floor area as rooms

Note: This issue occurs in Revit. However, it can also occur when exporting BIM models from other modeling tools due to incorrect IFC settings.

When exporting a model from Revit, the IFC options are configured by default so that the gross floor area (GFA) of a level is stored as spaces (IfcSpace) in the IFC file:

Figure 1: IFC option in Revit; areas are exported as spaces

Table showing Revit categories mapped to IFC class names, with "Flächen" category highlighted and mapped to IfcSpace

As a result, the GFA is created as spaces after the model is imported into the eTASK portal. This causes the total floor area of a building to double or multiply. Consequently, area calculations are prone to errors.

Figure 2: Gross floor areas arrive as rooms in eTASK

Table showing room data with columns for room number, designation, polygon area, deduction area, and base area. Three identical rows with area values of 708.40 m².

Autodesk Revit

To prevent GFA from being exported from Revit, you can adjust the IFC settings: File → Export → Options → IFC Options. Under the Area section of the Revit category, all four components must be set to “Not Exported.” This excludes the GFA during the export process.

Figure 3: IFC Option Configuration in Revit

Table showing Revit categories mapped to IFC class names and types, with some rows highlighted in red as "Nicht exportiert"

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