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Black Mold Removal Guide

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Black Mold on Wall with Rubber Gloves, Brush and Bottle

How to Get Rid of Mold in the House (DIY)

By M. Sylvia Chaume

Mold is everywhere. In nature, mold and other fungi have a vital role. They help dead matter decompose. Mold also helps make medicine, bread and beer. Some species of mold are harmless, but in a home, mold can be toxic.

Mold grows in damp, moist places, and consumes organic material such as wood, drywall, paper and dust. Several species can exist together, including:

  • Black Mold (Stachybotrys Chartarum) and another toxic mold is Aspergillus.
  • Dark Brown Mold in the bathroom is Cladosporium, a less toxic variety.
  • Mildew, a separate type of fungus, is Pale Grey or Whitish in color. 

Mold releases spores

Some spores produce mycotoxins, or toxic compounds. Mycotoxins on mold spores have been linked to serious health problems and disease. Reactions can be mild or severe, and range from

  • Mild sniffling to Sore Throat,
  • Itchy Skin and Eyes,
  • Asthmatic Reactions, and
  • Bowel or Respiratory disease. 

Detecting Mold

Like all living things, mold needs humidity, food and oxygen to survive. Look for groups of small dark spots on walls, ceilings or floors, especially in corners and nooks. Mold loves the dark, moist conditions behind pictures and draperies, under windowsills, in books and in tile grout.

Look in basements, crawl-spaces, and bathrooms. Test structural wood by pressing firmly. If wood is tender, it’s rotting, and mold is at work. A musty odor, especially in humid conditions, is a sure sign of mold in the house.


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Mold test kits can identify the amount and types of mold present, based on spore count. It’s not necessary to identify the type of mold in order to kill it. All species respond to the same treatment. 

How to get Rid of Mold

  1. For spot cleaning, a mild detergent will work. Use a sponge or scrubber, and thoroughly wash and dry the surface. For roofs and rough surfaces, use a stiff brush.
  2. Chlorine bleach kills mold. Clean and disinfect surfaces with half bleach, half water. If using acidic cleaners, or for large moldy areas, wear protective gloves, goggles and a filter mask (N-95 or higher) or respirator. Never mix bleach with ammonia or any other household cleaner! They could make a poisonous gas.
  3. Detergent and bleach will remove mold from a surface, but often the problem goes deeper. By the time a few spots appear on a wall, mold may be rampant on the other side.
  4. Find the source(s) of mold. Check under carpet, floors and roofs. Inspect wallpaper and ceiling tiles. Rip out and throw away damp or moldy materials such as insulation or drywall. Wear protective gear when handling moldy items. Clean and disinfect all surfaces with bleach. 

If cleaning up after a flood, dry everything within forty-eight hours. Toxic mold can grow within a day, so put rugs backside up in sunshine, and open doors and windows if possible. Use blowers to circulate air. Dehumidifiers can also help. 

Clean and sanitize carpets with a deep carpet extractor or professional steam cleaner. Vacuum with a high-efficiency particulate air (HEPA) vacuum. The HEPA filtration is smaller and will trap mold spores. Seal the vacuum contents in plastic bags, and discard as normal waste.

Professional Mold Remediation

If mold is stubborn or widespread, get professional help. Professional mold remediation is expensive, so check references and credentials. Compare and contrast service and price. Most companies offer a free consultation and estimate.

Mold Prevention

  • Without humidity, no mold can grow. 
  • Fix leaks around tubs, roof or pipes. Even a small leak provides a perfect habitat for mold.
  • Invest in a Dehumidifier. The Centers for Disease Prevention and Control suggests a humidity level of 45% or less.
  • Avoid over watering houseplants. Mold can grow in soil, or damp areas around plants.
  • Install bathroom and ceiling fans. Let air circulate through the house.
  • Clean air ducts and other dust-trappers.

The Environmental Protection Agency recommends an Air Purifier with a HEPA filter, to trap airborne mold spores. 

If possible, landscape so that water drains away from the house. 

Check thoroughly for mold, on a regular basis. 


Mold can be useful in nature, but has no place in the home. Proper cleanup and precautions will get rid of toxic mold, and prevent it from coming back. 

About the Author

She holds a Post Secondary non-degree award in Applied Sciences.

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Disclaimer: Articles not intended to Diagnose, Treat, Cure or Prevent Diseases.

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