I have a ceiling with a barrel vault, however it is just a section of an arc and not a semi circle. It is a true radius though, and is about 12′ wide. We want to put a 9′ wide window on the gable wall under this ceiling arc. My question is shoule the radius of the window arc be the same as the ceiling or does the window arc just need to be concentric.
When I look at this on a smaller scale using anything circular with a circle in a circle or overlapping circles both seem to work.