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1. Measure the length of your windowsill from underneath. 2. Mark your molding at that length, and then take off one inch. Mark that measurement on your molding, set the molding on
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1. Measure the length from the sill to 1/2-inch above the bottom edge of the rough opening at the head of the window or door. This is the length required for the side molding. 2.
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1. Measure the top of the window opening, along the inner edge of the casing, from corner to corner, using a tape measure. Mark out the measurement on a piece of exterior trim molding
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