Yes, chimney leaks frequently cause mold and mildew growth, especially in attics and wall cavities where moisture can sit undetected for months. The warm, humid conditions created by water intrusion are perfect for mold development. Mold from chimney leaks is particularly problematic because it often grows in hidden areas—inside walls, under insulation, or in attic spaces. By the time you notice musty odors or visible growth, the problem is usually extensive and expensive to remediate. The best prevention is fixing leaks immediately. Once water stops entering your home, existing moisture dries out and mold growth stops. We’ve helped many West Mansfield homeowners avoid costly mold remediation by addressing leaks quickly and thoroughly.