How do I stop roof trims from showing up inside?

"Admiral8Q;c-18164712" wrote:

"DeadFishy;d-1002387" wrote:
I'm not sure if I'm building my houses incorrectly but I cant seem to stop root trim from showing up on inside walls. What am I doing wrong?

For a section of roof to turn invisible, it must be enclosed 'indoors' in a room.
If that doesn't help, I could make a short video capture showing what I mean.

Maybe I've been building houses incorrectly but some interior rooms that have exterior walls still show roof trim inside. I have this issue especially when trying to build stairs with an open space below. I'll build a room to remove the floor and it gets counted as a room even though there are no walls (or floors for that matter). Thats what was happening in the image below.

https://i.ibb.co/J5j4xDP/Screen-Shot-2022-08-05-at-8-33-19-AM.png