In X13 it is not allowed me to changes casing material separately for interior and exterior
Box window.plan
It's a bug. It should be marked as an exterior window but for some reason the program thinks it's an interior window.
Windows and doors work a little bit differently in X13 than they did in prior versions. In X12 and prior, a window was only considered an interior window if it was a pass-thru otherwise it was always considered an exterior window. This was very different than doors which were considered interior or exterior based only on the room types on both sides.
In