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A window sill is the bottom piece of trim, or the ledge at the bottom of the window. While sills are a great place to put plants, theyâre also a necessary part of the window, keeping out rain and making windows more energy efficient.
The door sill, or threshold, is the bottom portion of your exterior door frame. It helps to keep the elements out and provides a seal, as well as a place to step as you enter the home. These thresholds wear out over time, because of foot traffic and exposure to the weather.ethod 2 of 2: Replacing a Wooden Threshold. Other than metal thresholds, the most commonly used material for a door sill is a hardwood like oak. Wooden thresholds often come in standard lengths that can be trimmed to size on site.