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One look at the latest window catalogs proves that interest in historical imagery is still growing. Windows can be ordered with a wide variety of trim options meant to evoke the site-built windows of yesterday; some of these are accurate, some not. At the same time we have the modern clad window, which is sophisticated in its watertightness but comes with next to no trim at all. All of this brings up the recurring question of how to reconcile new materials with more traditional appearances. Traditional Window Construction In a traditional wood window, the joints around the frame are covered and protected inside and out with wood casings (see Figure 1). Casings in older houses had to be wide enough