Inside, casings are the finishing touch to a window installation, the same as baseboards and door moldings finish off a room. they generally match the same moldings used in those applications so the room has a cohesive look. outside, casings match the style of the home so there are countless designs to choose from.. The other moldings in the room: door and window casings, chair rails and cornice or crown should be kept in proportion to the baseboards. don't for instance, use a 5 inch casing molding with a 4 inch baseboard, use a casing of 3
