Abstract: A sill assembly for covering the bottom frame of a door, a window or the like, of the adjustment-wedge type, wherein a wedge is operated from the interior of the door frame to align the crown of the sill with the bottom wedge of the door. The invention advances the art by providing extrusion molded members whose shape and disposition combines light weight and rigidity of the assembly, by utilizing the entire length of the sill for the wedging action and also by providing the sill crown of the type of an integral molded member including a reinforcing portion of a generally tubular cross-section which also forms one of the two wedging members.