Abstract: A molding for a UPVC sealed unit double glazed window or door comprises core and adaptor sections which may be assembled together to provide L, T or Z cross sections, in which the adaptor sections are provided with tongues which are longitudinally slidably insertable in grooves formed in the core section and are laterally retained therein. Profiled glazing strips have an angled tongue for insertion and retention within a groove of a core section by the presence of the glazing and sealing gaskets.