Thursday, July 5, 2007 Before installing a new metal threshold in an old doorway, you may want to cover an existing wooden sill with an L-shaped aluminum sill cover. This eliminates sill maintenance and conceals any previous deterioration. To install a sill cover, first determine its length.The length depends on how far the cover extends toward the exterior, because the width of the opening steps outward according to the configuration of the frame. To be on the safe side, make a cardboard template, and then trace the template onto the sill cover. After cutting the cover to its longest dimension. An aluminum sill cover (foreground) is fitted over the old wooden sill before installing a new threshold (center).A drain pan is sandwiched between the sill cover and the threshold. The pan's upturned lip turns away water that seeps through the threshold.
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