I've tooled around with various kitchen floorplan configurations, from very simple to overly complex, but almost always there are parts of the roof that are transparent. I'm not sure how to describe the angle that causes transparency, and even if I could the transparency isn't consistent . I build all my buildings symmetrically, but the transparency can occur on one side and not the other even if they both use the same kinds of angles. Kitchens are the only building I've noticed this in.
