Abstract: A double hung window assembly includes a rectangular frame formed by a pair of vertical jamb members connected by a horizontal sill member and a horizontal head member. Each of the members comprises a one-piece extrusion of rigid plastics material, and the members are rigidly connected with upper and lower welded mitered corner joints. The jamb and sill members have outer walls for the rough window opening and laterally spaced inner sloping walls which mate at the bottom corner joints. The jamb members also have inner channel walls spaced laterally inwardly of the corresponding sloping walls to define channels for receiving hardware for upper and lower sash frames each including extrusions of rigid plastics material.

Abstract: A double hung window assembly includes a rectangular frame formed by a pair of vertical jamb members connected by a horizontal sill member and a horizontal head member. Each of the members comprises a one-piece extrusion of rigid plastics material, and the members are rigidly connected with upper and lower welded mitered corner joints. The jamb and sill members have outer walls for the rough window opening and laterally spaced inner sloping walls which mate at the bottom corner joints. The jamb members also have inner channel walls spaced laterally inwardly of the corresponding sloping walls to define channels for receiving hardware for upper and lower sash frames each including extrusions of rigid plastics material.

Abstract: A window frame includes tubular sill, head and jamb members of extruded plastics material, and each member has laterally spaced inner and outer walls integrally connected by laterally extending transverse walls. A nailing flange projects laterally outwardly from each outer wall for securing the frame within a wall opening, and each frame member has an integral exterior portion projecting outwardly from the corresponding nailing flanges. The exterior portion of each frame member cooperates with an exterior transverse wall to define a groove or channel extending laterally inwardly from the outer wall for receiving the edge portion of exterior siding. Narrower frame members also have cavities within the interior transverse walls for receiving the edge portions of interior wood sill, head and jamb extenders.