Thermal Bridge Break Solutions | PA66GF25 Strips & Molds

A thermal bridge break is the fundamental design principle and the physical component used to interrupt a thermal bridge within a building element. It is the intentional insertion of a material with low thermal conductivity between two conductive materials to drastically reduce the flow of heat. In the context of metal windows, doors, and curtain walls, this break is a high-strength, low-conductivity strip, typically made from glass-fiber reinforced polyamide (PA66 GF30), that is mechanically locked within the aluminum or steel profile. This strip physically separates the interior and exterior sections of the metal frame, creating a barrier that is over 500 times more resistant to heat flow than the aluminum itself. The efficacy of a thermal bridge break is measured by its contribution to lowering the linear thermal transmittance (Psi-value) of the assembly. For the break to be effective, the material must not only have a low thermal conductivity but also possess sufficient mechanical strength to transfer structural loads (like wind pressure) between the separated metal parts and resist creep over decades of service. The implementation of a thermal bridge break is a cornerstone of modern sustainable construction, essential for meeting energy codes, improving indoor comfort, and preventing moisture-related damage.