You can! Although roofs are one of those strange elements that can fit in a few different places. Here’s some tips…
- the roof can sit in the same level as the walls
- the roof can sit in the level above
- the roof can exist in its own LEVEL/ELEMENT/LOCATION/CONDITION grouping separate from the rest of the structure. This way you can hide it in certain scenes and maintain layering efficiency.
- you can use a 2D Graphic/3D Object to represent your entire roof. I find this to work well at the end of a project when I need very specific line work
Let me know if that helps!