FYI
I think i know what the problem is with the Geometry.Intersect nodes; it’s Geometry Scaling.
Seriously? How did you figure that out?
Does it work now? 
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Is the project on RDS coordinates?
Kept looking into it. Really couldn’t stand it not working.
This topic made me look into it.
As my project contains several buildings on a grid of 80x250m i figured changing it might help.
My Graphs are kinda a mess now because of all the testing, so i gonna rebuild.
I’ll keep you updated.
No.
As i still not fully understand lacing and levels (i only started using Dynamo a year ago - self taught) maybe you can help setting those right so i end up with the Curves of the combined Solid(s).
Now my rooms are getting the Filled Region in the end.
CreateAreaFromRooms.dyn (65.5 KB)
Really nice that you figured it out! I will keep this trick in mind!!
Yes, but now the lacing part… I could still use some help with that.
I managed to set it right earlier (i don’t have that Graph anymore), but that was more luck then knowing
what i was doing.
Pretty sure i put some List.Flatten at the wrong places or aren’t needed. And pretty sure some lacings are wrong. Offset should be 100 and not 200. In my (test) project i should end up with 16 Filled Regions.
EDIT
I think i figured it out myself . This should work.
CreateAreaFromRoomsFINAL.dyn (94.4 KB)