Multiple levels on same height, problem with IFC-export

[elinorlorentzen6AF5X]

Hi,

I have a model thats going to be used in facility management. 

Note that I have'nt been a part of the process until now. The house is already built. 

Using Revit 2020.

The model contains two buildings that are more or less modeled as one. One of the buildings is called 100 wich is a existing building, and building 500 wich is a new building joining the exisiting 100 building. Phases has not been used. 

There are two sets of levels ( from level 09 up to 17), one set for building 100 and one set for building 500, for example: level 09_100 and 09_500. All levels are defined as Building Storeys. 

When I export this to IFC all of the levels come out correctly, except for one level,  level 12_100. 

What happens is that all the objects that are associated with 12_100 ends up in the 12_500 level. When looking at the IFC in notepad/Solibri/SimpleBIM the 12_100 level simply doesn't exists as a Building Storey. 

After investigating the basics I can't find whats wrong in Revit with the 12_100 level. Everyting looks fine, same as in the other XX_100 levels. 

The only thing I can see is that all the other levels are in different height between the two buildings, so level 09_100 and 09_500 is not in same elevation, height of level. However the 12_100 and 12_500 is at the same height. 

Does anyone know what the problem is and how to solve it? 

I ran in to this when I was splitting the ifc in SimpleBIM and wanted to use the different levels to easy exclude the one building from the other. I'm not depending on the levels for this but I really want to know.

Thanks in advance. 

/Ello

[Alfredo_Medina]

If the model contains two buildings, have you tried exporting the two buildings separately, too? Usually models refer to one building, anyway. That would simplify things and most likely solve the issue of the levels.

[cbcarch]

Another possible solution would be to create each building as a separate Revit file, then Link one file into the other. Then try exporting to IFC. Not sure how IFC handles Linked Models?

[elinorlorentzen6AF5X]

Thank you for replying. aThank you for replying.

I totally agree with you, two models would be the best thing from the start. As I said, I have not been a part of this project until now. My question is simply regarding this specific problem with the levels occurring in the IFC-export from the model in Revit as it is today. As we both agreed on, two models would be the best thing. However, this specific problem surely has an explanation.

[cbcarch]

Try renaming Level 12_100 in Revit to something else as a test, such as Level 12_A.

Then export to IFC. Any difference?

[cbcarch]

Check if you have Groups on Level 12_100.

If so, you may need to Ungroup for successful export to IFC.

[elinorlorentzen6AF5X]

After consulting colleagues we think this is an IFC-exporter bug. My software are up to date. I did a test, made a new project with two simple multiple storey buildings, one set of levels per building with separate naming and I made 3 out of 7 levels at the same height, all building storeys. The same problem occurred with the levels on same height. For example "Level 14_001" and "Level 4" was at the same height and came out as one, "Level 4", but "Level 5_001" and "Level 5" that has different heights came out correct, separately.