Long heating seasons create strong indoor-to-outdoor temperature and vapor differences.
Diagnostic effect
The same visible symptom can come from a different moisture direction or seasonal mechanism in this climate.
What to record
Include outdoor temperature, humidity, precipitation, wind and whether the building is heating or cooling.
Regional layer
Use local construction practice and official guidance while retaining the same canonical symptom and cause objects.
Observe→Distinguish→Control source→Verify
Living dossierPublished knowledge is connected and improved as new cases, images and outcomes are added. Updated 2026-07-20.
