Abstract: The object of this invention is to provide a composite window framework fabricated using recycled styrene foam panels. This window framework consists of a window frame (30) and one or more movable sashes (12). Each of the window frame (30) and the movable sashes (12) consists of an aluminum outside panel (45), (25) and an insulation inside panel (35), (15). The inside panel (35), (15) is produced using recycled styrene foam through an extrusion process. A magnet (5) is set on the facing surfaces of the sashes (12) so as to allow the windows (10) and (10′) to be magnetically attracted to each other while accomplishing a desired sealing effect at the junction between them when the windows are closed. This window framework accomplishes a desired soundproofing and insulating effect, and is less likely to be decayed or deformed due to moisture or temperature differences between the outdoor and indoor environments.