Method of manufacturing an insulated frame member

A method of manufacture of an insulated frame member for supporting a glazing unit, the insulated frame member comprising first and second frame components of a relatively high thermal conductivity material held in a spaced relationship by a first connector component and by a second connector component, the first and second connector components being of a relatively low thermal conductivity material, the first connector component facing towards the glazing unit, in use, the first and second frame components together defining a void substantially filled with a foamed material, the method comprising the steps of:

• (a) assembling the first and second frame components and the first and second connector components by sliding the frame and connector components relative to one another in a longitudinal direction of the frame member to define the void;
• and
• (b) introducing a foamable material into the void and foaming the foamable material in situ to exert a pressure upon the first and second frame components and upon the first and second connector components, wherein the first connector component is of a width greater than or equal to the thickness of the glazing unit, the first connector component extending from an outer wall of the insulated frame member defined by the first frame component to an inner wall of the insulated frame member defined by the second frame component, wherein the first connector component has longitudinal edges each of which is provided with a pair of spaced projections that define therebetween respective L shaped mounting recesses receiving, in use, corresponding L-shaped mounting formations of the first and second frame components.