Roofs appear as "IfcSlab" after export to IFCxml

[Anonymous]

Hi to All,

I use ArchiCAD 15 and when I export a model of a 2-floors building with
standart Roof (45 degrees, 4-sided) , when I export this model to IFCxml file format, the roof is exported as Slab.

Instead of exporting it as IfcRoof ArchiCAD exports it as IfcSlab, and this way important Info as Roof's Offset, Height and Angle are lost.

Why this Bug happens?

Is there a workaround ?

[Laszlo Nagy]

Check the Element Classification Field for the Roofs. They may be set to "Slab" and this is why it is exported as Slab to IFC.
YOu can specifically set this field to Roof and then it should export them as IFCRoof.