Casing is the decorative molding or framing around a window that is used to cover the space between the window frame or jamb and the wall.
What are the parts of window trim called?
The sill, head and jamb all make up the window frame. The window frame is usually made out of wood or vinyl. ... Jamb – The vertical sides of the window frame. Apron – A piece of decorative trim installed beneath the railing or sill.