Abstract: According to the invention, an architectural thermal barrier component and method of forming same includes an elongate section incorporating a thermal break, for example for use in the manufacture of window, door, skylight frame assemblies and other fenestration related assemblies. The method comprises forming multiple co-extensive elongate elements, one of which includes a channel portion, and aligning the elongate elements with one another by snap-fitting the elements together or sliding the elements together longitudinally. After the initial assembly, the method includes crimping the elements in engagement with one another, filling the channel with a settable liquid of low thermal conductivity, effecting solidification of the settable liquid to form a solidified thermal barrier element, and cutting longitudinally through or debridging any part of the elongate elements that bridges the thermal barrier element.