I have a question

[PNS Questions]

pns questions is a class.
PNS stands problems and soulutions!!!! thank you very much joe. (:

its a serious question joe, we teach a class that is using chief architect -interior design.

more info:
a student has a house which the second floor and the first floor have a gap, in the 3D camera view you can clearly see straight through the house. i was wondering if anyone has any suggestions on how to fix this, ive never seen chief do something like this before.