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Corner boards are the vertical boards found on your roof on the corners of an enclosed chimney structure. These boards are both structural and decorative, and are used to protect the chimney.
Corner boards need to be properly installed and secured with flashing or crickets so that moisture can't slip under and behind the boards and enter the interior of your home through the chimney or under the roof shingles. Such moisture can lead to mold and mildew problems. Corner boards are also subject to rapid deterioration as they face the wind, rain, snow and sleet. These boards generally need replacing more quickly than boards in more protected areas.