Adjustable door jamb anchor

A method of anchoring a door jamb having a top wall member joined by at least one side wall member, which comprises:

• (a) positioning an adjustable jamb anchor on the surface of a floor, said jamb anchor having at least one frame member formed in an L-shaped configuration with horizontal and vertical planar portions, said horizontal portion having a lip formed in the outer edge thereof so as to provide a slot, and said jamb anchor further including a pair of L-shaped overlapping members supported by said frame member, each overlapping member having horizontal and vertical planar portions, said overlapping members having the horizontal portions thereof retained in overlapping relation within said slot and between the vertical portion of said frame member and said slot;
• (b) mounting the door jamb so that the side wall member thereof extends adjacent to the corresponding vertical members of said jamb anchor;
• (c) adjusting the dimensions of said jamb anchor by sliding said overlapping members relative to each other until the vertical members of said anchor are contiguous with the side wall member;
• (d) securing the jamb anchor to the floor;
• and
• (e) securing the side wall member to the jamb anchor.