Summary: when I was building one of my houses the roof got built into the wall.
Steps to repro:
- build a u shaped building
- then build up the walls
- add your roof at a max height of 6 and a slope of 2.
- then your will have your roof in the walls.
Expected results: a roof on top of the walls
Actual results: a roof in the wall
Notes: I just want to say this… another brick in the wall