Steps

Recognize efflorescence as the visible deposit of water-soluble salts left behind after moisture migrates through concrete or masonry and evaporates at the surface — its presence confirms moisture has moved through the material, even if the surface currently looks dry.
Distinguish plain efflorescence (a moisture-migration symptom) from more serious indicators — spalling, cracking paired with efflorescence, or a crumbly/friable surface can point to more advanced saturation, freeze-thaw damage, or reinforcing-steel corrosion.
Trace the moisture pathway rather than just cleaning the deposits — recurring efflorescence after cleaning points to an ongoing source (exterior grading/drainage defect, failed dampproofing/waterproofing, a plumbing leak, or condensation) that needs correction.
Use location as a diagnostic clue: efflorescence low on a foundation wall or at the wall/floor joint often points to below-grade water intrusion, while efflorescence higher on an above-grade wall more often points to a flashing/coping/WRB defect.
Confirm with a simple field moisture check (plastic-sheet condensation test or surface moisture meter) whether the substrate is currently damp, since efflorescence can persist visually after the source has dried.

Known gotchas

Efflorescence is a symptom, not a defect to treat directly — painting or coating over it cosmetically without correcting the moisture source often traps moisture and can accelerate underlying deterioration.
New construction can show efflorescence simply from residual mix water leaving concrete/mortar during initial curing — don't over-diagnose a chronic intrusion problem from efflorescence alone on a recently placed slab or new wall without corroborating evidence.

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Diagnose what efflorescence on a foundation wall indicates about moisture pathways

Steps

Known gotchas

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