1. Stop at the safety boundary
Do not remove large areas of insulation before preserving the pathway evidence.
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, equipment use or plumbing activity.
4. Compare, do not assume
Supports this pathway
- The patch has a defined wettest edge
- Staining is visible on framing above
- A repeatable trigger precedes wetting
Weakens this pathway
- The entire attic is uniformly humid
- The patch does not change through events
- No plausible path exists above it
5. Repeat only safe checks
- Photograph before moving material
- Trace visible framing upslope
- Record trigger timing and compare adjacent dry insulation
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. Use a roofer, plumber or ventilation professional based on the strongest repeatable trigger.
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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