1. Stop at the safety boundary
Do not apply impermeable coatings over active moisture movement.
2. Capture the baseline
Take one context photo, one close view and a short note describing location, date, weather, recent water use, equipment state and occupancy.
3. Track the trigger
Rain, snowmelt and seasonal soil moisture.
4. Compare, do not assume
Supports this pathway
- Deposits regrow after wet weather
- The pattern has a consistent height or edge
- Adjacent masonry darkens before crystals appear
Weakens this pathway
- The powder does not return after cleaning
- No moisture correlation exists
- The material is a surface residue from another source
5. Repeat only safe checks
- Photograph deposit height and shape
- Record rain and downspout conditions
- Compare wall and floor-joint patterns
6. Decide the next step
If the pattern is active, expanding, safety-related or requires opening inaccessible construction, stop self-help testing and prepare an evidence-based handoff. A drainage or foundation professional should evaluate recurring bulk water or deteriorating masonry.
7. Verify the outcome
After any action, repeat the same observation under a comparable trigger. A dry surface immediately after work is not sufficient proof when the original symptom was intermittent.
Observe→Compare triggers→Repair source→Verify outcome
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