Thermal Bridge Window Solutions | Polyamide Strips for Insulation

A thermal bridge window refers to a fenestration system specifically engineered to eliminate or drastically reduce the thermal bridge inherent in standard metal-framed windows. In a conventional aluminum or steel window without a thermal break, the metal frame acts as a highly efficient conduit for heat, creating a direct path for thermal energy to flow between the interior and exterior. This results in significant heat loss during cold weather and heat gain during warm weather, leading to elevated energy costs for heating and cooling. More critically, it causes the interior surface temperature of the frame to drop, often below the dew point, which triggers condensation. This condensation can damage window fittings, promote mold growth on adjacent walls, and create an uncomfortable indoor environment. A true thermal bridge window addresses this fundamental flaw by incorporating a thermal break within its frame and sash profiles. This break is a continuous strip of a material with very low thermal conductivity, typically glass-fiber reinforced polyamide (PA66 GF30), which is mechanically locked into the aluminum extrusions during manufacturing. This polymer strip physically separates the inner and outer metal parts of the window, creating a barrier that reduces heat flow by over 90% compared to an unbroken metal frame. The performance of such a window is quantified by its overall U-value, with the thermally broken frame contributing to a much lower and more efficient rating. By mitigating the thermal bridge, these windows enhance occupant comfort by maintaining warmer interior frame surfaces in winter, prevent condensation, reduce energy consumption, and contribute directly to meeting stringent building energy codes and green building certification standards like Passive House, LEED, and BREEAM.