Remove Black Mold From Drywall
While most mold or mildew does not contain the dangerous mycotoxins, all mold can trigger asthma or cold-like symptoms in susceptible people. Mold is not healthy. Black mold can be removed from painted drywall but if the drywall is unpainted, it should be replaced as you will never get the mold out from inside or behind the drywall.
Instructions
1. Assess the drywall. If the black mold is heavy and extensive, the drywall wet through, bowed out, or crumbling, the drywall needs to be removed and replaced because the mold cannot be completely removed. Search this site for directions on remove moldy drywall or call a professional. If the mold is just a speckling on the painted surface such as is common in bathrooms, it can be removed safely and completely.
2. Protect yourself from disturbed mold spores and caustic chlorine bleach solution while removing mold. Wear an OSHA approved respirator, not one of the paper dust masks which won't protect you from spores or fumes. Wear eye protection, especially if working overhead on a ceiling. Since even a mild bleach solution can burn and irritate your skin, wear protective gloves as well.
3. Protect surrounding surfaces since bleach can ruin fabrics and carpet. Use plastic, taped into place. Cover that with old towels or drop cloths to hold it in place if you are going to walk on it.
4. Add about half a cup of household chlorine bleach to a gallon of water. For heavily soiled or dirty areas, up to 1 1/2 cups of bleach may be added to the water but no more than that. Sponge the mixture thoroughly onto the moldy areas and let it sit for at least 15 minutes.
5. Add a little dishwashing detergent to clean water and wash the area down. Then rinse it completely with clean water and dry it with old towels.
6. The drywall should now look clean with no sign of black mold. The cleaning may have discolored it and if you need to repaint, use only water based primer and paint because oil based paints contain organic compounds that provide nutrients for mold to grow on. If the mold keeps recurring you should install a venting system or a dehumidifier in the area because mold thrives in humid environments.
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