Abstract: An adjustable screed with a body having a top rail and a bottom rail; a horizontal adjustment mechanism for establishing a horizontal plane for the screed and for securely maintaining the horizontal plane; a vertical stabilizing mechanism for attaching the screed to an external object; a securing mechanism for securing the screed to the external object; and a registration mechanism for registering one screed to another screed after initial adjustments have been made to the first screed secured to the external object.