Cathedral Ceiling

[braido11]

Hello,

I have a great room extension with a 5-12 pitch that is perpendicular to the main roof line. On the second floor we have an open to below area off of a loft. We would like to make this area with a cathedral ceiling. I have tried a few ideas, such as unchecking the "ceiling over room" box, but I get an ceiling that does not look like a triangle from front to back. Can 6.0 support this or an I doing something wrong!?

Thanks