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Chimney flashing is thin metal that attaches to the roof surrounding a chimney to deflect rain water and melting snow. Flashing, most often made of copper or aluminum, is constructed to cover the seam around the chimney, causing the water to flow away from the chimney. Flashing can be placed over or under the roofing shingles.
Chimney flashing is an important part of your roofing system and a key factor in keeping the interior of your home dry. Without flashing, rain water can seep under the roofing shingles and find the seam around the chimney. Water can travel along the joists for quite a distance, so the damage from just one leak can be extensive. In addition, moisture in your attic and along your ceiling joists can lead to mold and mildew, creating an unhealthy living environment, especially for those with breathing disorders like asthma and COPD.