The thermally broken frame extrusion is designed with an open cavity in the mid section of the frame that runs the entire length of the frame. This open cavity is filled (poured) with a high strength, long lasting, non-thermally conductive epoxy. After the epoxy cures the aluminum is milled away on the bottom of the frame just below the epoxy (debridged). When the process is finished there is a complete separation of the exterior aluminum frame exposed to temperatures on the outside of the building and the interior frame exposed to interior temperatures and humidity.
Poured and debridged thermal breaks have been used in window and skylight frames for many years and continue to be the most effective design in minimizing exterior temperature transfer to the interior building space and in the elimination of condensation.