White basement powder confirmed as efflorescence, not mold
The crystalline deposit returned after brushing and aligned with seasonal moisture movement through masonry.
✓Measurement Supportedrecorded confirmation level
01 / OBSERVED
→White crystalline powder on a basement wall
02 / CONFIRMED CAUSE
→Moisture transporting salts through masonry
03 / REPAIR
→Exterior drainage was improved and indoor storage was moved away from the wall.
04 / VERIFY
The wall dried seasonally and the deposit returned at a much lower rate.
WHAT CHANGED THE DIRECTION
The evidence that separated the cause
Supporting clues
- Dry crystalline texture
- No musty odor
- Worse after snowmelt
Checks performed
- Texture comparison
- Moisture trend
- Exterior drainage review
Field lessonA surface deposit can be evidence of moisture transport without being biological growth.
