As a homeowner, you should reset the opener to prevent outsiders from opening the door with a remote that's set to a Liftmaster default code. A simple procedure allows you to reset the opener for one or more remotes.
doorsill - the sill of a door; a horizontal piece of wood or stone that forms the bottom of a doorway and offers support when passing through a doorway. doorstep, threshold. 1  doorway, room access, door, threshold - the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close; he stuck his head in the doorway.
Wall flashing is typically found at interruptions in the wall, such as windows and points of structural support. Sill flashing (or sill pan) A concealed flashing placed under windows or door thresholds to prevent water from entering a wall at those points. Roof penetration flashing Used to waterproof pipes, supports, cables, and all roof protrusions.