Stop molding also helps with windows by keeping sashes, such as the bottom sash of a double-hung window or the top sash of a casement window, from swinging in or out.
Beyond its practical use, stop molding adds an extra layer of insulation, enhancing privacy and preventing light of heat from sneaking in or out of rooms.
So, while it may be small in size, stop molding is a big deal when it comes to comfort, security and energy efficiency!