Definition
Moisture intrusion is water getting into places it shouldn't—through walls, under foundations, or down from roofs. It's sneaky because small problems grow into big, expensive structural damage and mold. Water stains in basements or corners are red flags that something's letting water in.
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Moisture intrusion is a leading cause of structural damage and mold. Sources include poor drainage, foundation cracks, roof leaks, and wind-driven rain. Moisture detection and remediation are important for building longevity. Persistent moisture indicates underlying problems.
Pro Tip
Fix the source of moisture first, not just the cosmetic damage. A basement that looks dry after cosmetic work but still has moisture coming in will keep causing problems—don't waste money patching without solving the root issue.
Example
Water stains and mold in corner of basement indicating moisture intrusion through foundation.