Link to an IFC file when you want to perform additional design work in Revit using the IFC file as a reference.
For example, another team designed the architectural model, and you link its IFC file so that you can design the interior.
You will not be able to make changes to the IFC model in Revit, but linking the IFC file allows you to see the model so you can continue the design work in Revit.
If you later change or update the original IFC file, the Revit model reflects the changes when you re-open it or reload the IFC file.
After you link an IFC file to the Revit model, the IFC file is listed in the following locations:
While linked IFC files are read-only in a Revit model, you can use them as references to do the following:
If the IFC file changes and you reload it into the Revit model, verify previously established references. Some changes to IFC geometry may make it difficult to maintain references in the Revit model.
When creating rooms in the host model, you can use many IFC-based elements to define room boundaries, including walls, roofs, floors, ceilings, columns, building pads, doors, and windows. IFC-based walls use the wall finish face as the room boundary.
When you link an IFC file, by default its Room Bounding property is turned off. To enable room bounding for all elements in the IFC file that support it, see Use Room Boundaries in a Linked Model.
When you link an IFC file, its elements are assigned to a default construction phase in the Revit model. That phase is used for the Phase Created property of the elements in the linked IFC file.
Specifically, the assigned phase is determined by the starting view of the template used during the IFC Import/Link operation. See Specify the Starting View for a Model and Select a Template for IFC Files.
When updating a Revit model with an IFC link, Revit proceeds as follows: