Black Mold - Pictures, Causes And Signs (Ultimate Guide)

What is Black Mold?

Black mold, scientifically known as Stachybotrys chartarum, is a toxic fungus that produces harmful mycotoxins. Unlike common household molds, black mold releases toxins capable of causing serious respiratory problems, chronic fatigue, and neurological issues.

Black mold appears as dark greenish-black colonies with a slimy texture when actively growing. When its water source dries up, it becomes dry and powdery but remains equally dangerous. According to our analysis of over 15,000 mold inspections since 2005, Stachybotrys chartarum ranks as the third most common toxic mold found in Canadian homes.

What Causes Black Mold?

black mold
Black mold on water-damaged drywall

🌊 Primary Causes of Black Mold Growth

  • Prolonged moisture exposure: Water damage from flooding, leaks, burst pipes, or chronic condensation
  • Delayed water damage response: When water seeps into materials like drywall or wood and remains for 24-48 hours
  • Poor ventilation: Trapped moisture accelerates mold development
  • High humidity: Levels above 60% provide the moisture black mold needs to thrive

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