Abstract: A single extruded cross-section and a single milled cross-section provide the rails and stiles of window sashes with the trouble-free functionality of vinyl and the esthetic functionality of wood. A few accessory extruded cross-sections provide weatherproof meeting rails and jambs and out-of-plumb compensation. Assembly of the extruded and milled components is accomplished simply and securely. This structure is characterized by plastic extrusions that feature a few interactive primary cross-sectional profiles, and milled wood or otherwise-shaped parts that feature a secondary cross-sectional profile. The primary and secondary profiles coact simply, securely and attractively.

Abstract: The present invention provides (1) a sash window assemblage having basic wood construction with selectively milled kerfs and (2) exterior vinyl cladding in the form of vinyl extrusions of particular configuration. These vinyl extrusions, in cross section, feature facing portions that lie snugly against front and edge surfaces of the rails and stiles of a window sash, gripping portions that snap and lock into the kerfs, sealing portions that squeeze tightly against the rigid elements they contact, and spline portions that extend upwardly and downwardly. The spline portions can be cut readily for conformation with an out-of-plumb frame. The facing and gripping portions have sufficiently great cross sectional thickness to impart rigidity. At least sections of the sealing portions have appropriate composition and sufficiently small cross sectional thickness to impart flexibility.