1. Stop at the safety boundary
Do not cover wet insulation or add ventilation openings without first addressing major indoor air leakage.
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
Cold weather followed by attic warming or sun.
4. Compare, do not assume
Supports this pathway
- Many nails show similar frost
- Drops appear during thaw without rain
- The attic has visible air-leakage or ventilation issues
Weakens this pathway
- Only one localized roof area wets
- Rain immediately precedes the symptom
- Water tracks from an exterior penetration
5. Repeat only safe checks
- Photograph frost distribution before thaw
- Note indoor humidity and attic temperature
- Check bath and kitchen ducts for proper exterior termination from safe access
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. An insulation or building-envelope professional can separate broad condensation from localized roof entry.
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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