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Improving the thermal performance of glazing systems is becoming increasingly important for energy conservation in buildings. At Barley Chalu, we break the continuity of the framing profiles using a low conductivity polyurethane resin which is poured into an extrusion cavity and when hardened the base of the cavity is debridged(sawn), resulting in a composite extrusion which performs as a single structural entity. The resultant thermal bridge separating the interior and exterior of the frame has excellent energy conservation properties and will substantially reduce condensation or frost formation.