What should I record during several hot days to compare causes safely? The safest answer begins by recording location, trigger and timing before assigning a cause.
What the question is testing
Solar load, attic temperature and cooling operation change pressure and material response. The question becomes more useful when it separates what happened first from what was noticed later.
A practical comparison
Record several hot 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 walk unsupported framing, disturb suspect insulation or approach damaged wiring. Active roof leakage, sagging materials or widespread decay needs qualified assessment. Use the connected atlas guide to build a bounded evidence packet and a clear professional handoff when needed.