IFC tip: Assign the IsExternal standard parameter to the Revit support

Supports in Revit have no property Function such as walls. 

However, you can create your own parameter and take it into account during IFC export - the important thing is that it is a Yes/No parameter, since the IFC property is also known as boolean is defined (see IFC documentation). 

This parameter then only needs to be assigned correctly with the parameter assignment table during export. 

Example with parameters Outside: 

The parameter mapping file is a simple text file (UTF-8 format) with the following syntax: 

IFC Pset Name IFC Property Name of the Revit property

In the example above: 

Pset_ColumnCommon IsExternal Outside

Important: 
- the spelling must correspond exactly to the spelling in the IFC documentation, also with regard to capitalization
- The value in Revit must be available / box must not be grayed out 

The standard parameter is now filled correctly when exporting: 

You can find out more about IFC and Revit in the Autodesk Revit IFC Manual.