Mold forming on a ceiling under a duct in a studio is shown. Warm, moist air condenses and forms water on ducts carrying cold air through the attic or crawl space. The condensation is a sign that the duct is not insulated or missing a vapor barrier. Eventually the water saturates the insulation and drywall and mold spores (which are everywhere) take root. (AP Photo/The Family Handyman)
Read the article: Mildew menace: Little black spots often can become big problem
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