Molds photographed using a microscope.
Are your indoor mold levels higher than those outside?
Black Mold Preventatives
How can you prevent mold from growing in your house?

Contributing Causes of Black Mold

  • -Air-conditioning leaks sustain mildew.

  • -Bathrooms are unventilated, allowing surface mold.

  • -Central Air unit's condensation pan houses mold.

  • -Humidifiers provide a mold growth medium and mold distribution system.

  • -Unventilated crawl spaces house mildew.

  • -Vinyl wallcoverings trap moisture. Mold degrades the surface between the vinyl and drywall.

  • -Water-resistant drywall degrades when subjected to moisture.

  • -Washing machines installed in a room without a floor drain. Water with no point of exit will soak into adjacent carpet, drywall and insulation.

Preventative Measures

  • -Seal air conditioning duct joints with flexible mastic so they don't leak.

  • -Remove bathroom surface mildew by scrubbing the area with a 1/2 percent bleach solution. When dry, prime it with an alcohol-based, white pigmented shellac. Make sure to install a source of ventilation: a bathroom fan or window.

  • -In spring, clean the pan with a 1/2 percent bleach solution and anti-mold cleanser to verify the drain pan's drain is active.

  • -Regularly treat clean humidifiers with an antimicrobial solution to break the cycle.

  • - Keep the air moving through crawl spaces to keep moisture down and fog with anti mold products.

  • -Use wallcoverings with impermeable paper or use paint.

  • -Instead of water resistant drywall, use cement backer board, which is undamaged by moisture.

  • -Always provide a floor drain near the washing machine.

Written By:  staff researchers 
Date Posted: 2007-08-06  

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