For clients who choose to forgo the natural wood look, cladding can be selected to cover the exterior of window and door components. Aluminum is the most common metal selected, and when it is processed, it is either extruded to shape or is roll-formed, cut, and folded to shape. Of the two processes, extruded aluminum has superior strength, profiling, detailing and stability. When viewed microscopically, extruded aluminum also has a much more uniform surface, allowing for even paint distribution. A roll-formed product has more surface bulges and depressions, resulting in uneven paint distribution, which may lead to spotting as the finish ages.
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