# Roof in Revit and IFCBuildingElementPart- IFC4

**URL:** <https://forums.buildingsmart.org/t/roof-in-revit-and-ifcbuildingelementpart-ifc4/4989>\
**Category:** IFC\
**Tags:** ifc, revit\
**Created:** [October 25, 2023, 12:17pm UTC](https://forums.buildingsmart.org/t/roof-in-revit-and-ifcbuildingelementpart-ifc4/4989 "2023-10-25T12:17:29Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Meray](https://avatars.discourse-cdn.com/v4/letter/m/958977/32.png) [@Meray](https://forums.buildingsmart.org/u/Meray)\
**Post date:** [October 25, 2023, 12:17pm UTC](https://forums.buildingsmart.org/t/roof-in-revit-and-ifcbuildingelementpart-ifc4/4989/1 "2023-10-25T12:17:29Z")

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I am testing **IFC4** export from **Revit**. I chose in Revit: Parts Visibility: Show parts, in order to obtain IFCBuildingElementPart. (photo 1 from Revit2024)

Whereas the problem is for the **Roof** , I can’t split the element into parts (photo 2 from BIMCollabZoom, Photo 3 the IFC text)  
The Question: why we can obtain Building Element Part, so that IFCBuildingElementPart for all elements (Wall, Ceiling, Floor) and not for the Roof.  
Is it a bug ? or I missed something.

 ![image](https://us1.discourse-cdn.com/flex016/uploads/buildingsmart1/original/2X/b/baee5ec53dc8f6dcf2c58580f6e8cb50bf3af071.png)  
 ![image](https://us1.discourse-cdn.com/flex016/uploads/buildingsmart1/original/2X/1/1f3636cc00fd40d711d79cd47ab1e3b17a4e45ee.png)

 ![image](https://us1.discourse-cdn.com/flex016/uploads/buildingsmart1/original/2X/6/63f3067b125f491bd4e76af8acb92c5ac7b9a02c.png)

Thank you in advance

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**Author:** ![angel.velez](https://avatars.discourse-cdn.com/v4/letter/a/4bbf92/32.png) [@angel.velez](https://forums.buildingsmart.org/u/angel.velez)\
**Post date:** [October 30, 2023, 3:38pm UTC](https://forums.buildingsmart.org/t/roof-in-revit-and-ifcbuildingelementpart-ifc4/4989/2 "2023-10-30T15:38:40Z")

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Probably just because you haven’t split the roof into parts. If you send this as an email to me I can get you more support on it - angel . velez @ autodesk . com.