Door frames

A door frame comprising:

• opposed door jambs, and
• a door head,
• said jambs and said head each being formed from a metal section of channel shape having a base wall which includes a door stop and opposed side walls,
• said side walls being of a width such that when said metal section is applied to a door opening within a wall having plasterboard sheeting on the wall around the opening, said opposed side walls of said metal section overlap and lie closely adjacent to the outer surface of the plasterboard with the edge of the plasterboard being concealed within the interior of said metal section,
• each said opposed side wall being perforated with a multiplicity of perforations over its entire area to permit a skim coat of plaster to be applied over each said opposed side wall and the adjacent part of the plasterboard,
• the entirety of each said opposed side wall being offset inwardly relative to said base wall of said metal section whereby said metal section provides, adjacent said base wall, an outwardly projecting lip which defines an edge for the skim coat which thereby conceals substantially the entirety of each said opposed side wall,
• said metal sections being adjustable in width to accommodate the thickness of the wall and each said metal section comprising
• a first metal component shaped from a metal strip material to provide one of said opposed side walls and said door stop and a lateral slot adjacent to an edge of said door stop, and
• a second metal component shaped from a metal strip material to provide the other of said opposed side walls and a portion of said base wall which engages with a friction fit within said lateral slot to permit width adjustment by relative displacement between said opposed side walls of said first metal component and said second metal component.