Why is there black mold on my walls?

Black mold spores are everywhere. The most common reasons for black mold growing on walls are very high humidity and/or water leaks. In the case of humidity, the water vapor in the air condenses when it comes in contact with cold surfaces (such as walls) and forms liquid. It is common with exterior walls. The water is then absorbed by the wall materials, providing the mold spores a perfect environment to grow.  By allowing excess moisture to stay in the house, you encourage it to flourish.

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