What should I record during several very cold days to compare causes safely? The safest answer begins by recording location, trigger and timing before assigning a cause.
What the question is testing
Extended cold magnifies air leakage, frozen drainage and thermal bridging. The question becomes more useful when it separates what happened first from what was noticed later.
A practical comparison
Record several very cold days, the first affected location and the comparable areas that stayed normal. Repeat the observation only under safe, comparable conditions and note what stayed unchanged.
Limits and next step
Do not seal drainage openings or conceal active wetting. Broken glazing, unstable frames, rapid movement or water near electricity requires qualified repair. Use the connected atlas guide to build a bounded evidence packet and a clear professional handoff when needed.
