Black mold
Black mold removal: what the color tells you, and what it doesn't
"Black mold" usually means Stachybotrys, but many common molds look dark. You can't tell the species, or the risk, by looking. What matters is how much there is, where, and why it's wet.
Treat it like any significant mold growth
The EPA notes that molds come in many colors and that any indoor growth should be cleaned up and its moisture source fixed. Dark growth on drywall, under carpet, or behind baseboards usually means materials stayed wet for a long time, so expect the job to involve removing material, not just cleaning a surface.
Why scrubbing with bleach isn't enough
- The EPA doesn't recommend biocides such as chlorine bleach as a routine practice during mold cleanup.
- Dead mold can still cause allergic reactions, so it has to be removed, not just killed.
- Porous materials like drywall, ceiling tiles, and carpet may be impossible to clean fully and often have to be thrown away.
- Never mix bleach with cleaners that contain ammonia, which produces toxic fumes.
How larger black mold jobs are handled
Beyond about 10 square feet, the EPA points homeowners to professional guidance. A typical job sets up containment and negative air, removes affected materials inside the containment, HEPA-vacuums and cleans framing, dries everything, and verifies before rebuild. See the six-step process.
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