Efflorescence patterns are also sometimes mistaken for mold growth. When moisture migrates from the exterior through concrete, it dissolves some materials in the concrete. When the moisture evaporates on the inner side of the concrete wall, this material remains behind, sometimes looking like clumps or lines of fuzzy growth. This material is made of minerals, not mold; still, the presence of efflorescence indicates a moisture-intrusion problem in a basement. Mold requires moisture for growth, so you want to keep water out of your basement. Efflorescence on a foundation wall (picture above).  If your basement has ever experienced water intrusion from...
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