You can use the roof tool again. Draw circular outlines in plan view, then use the magic wand. You could draw a circular roof, then subtract the interior opening, leaving a "ring" of roof.
Richard -------------------------- Richard Morrison, Architect-Interior Designer AC26 (since AC6.0), Win10
Sure. Draw a circle using arc/circle tool. Set your roof tool to "polygonal" roof. After you set the pivot line and slope direction, you can use the magic wand to create the circle roof. If you select the roof, then you can magic wand a circular hole in the roof using a slightly smaller circle. Hope those are easy instructions. It is almost faster to do this than to explain it.
Richard -------------------------- Richard Morrison, Architect-Interior Designer AC26 (since AC6.0), Win10