Before any check
Photograph Cold snaps and ventilation changes, record the trigger and preserve the original condition. Confirm that access is safe and that the check will not disturb electrical equipment, hazardous materials, structural support or contaminated water.
Check the trigger
Repeat only one ordinary operating or weather-linked variable where safe. For this facet, the useful question is whether How falling outdoor temperature and changed ventilation shift surface temperature and indoor moisture balance. changes in a predictable way when that variable changes.
Check the route
Inspect accessible transitions through windows, wall corners, exterior closets, roof slopes or thermal bridges without cutting, drilling, removing guards or opening energized or regulated assemblies. Note both positive clues and intact boundaries.
Use a reference condition
Compare an unaffected room, component, time period or weather event using the same method. A control prevents normal variation from being mistaken for evidence of failure.
Record the result so it can be repeated
- Record indoor humidity and outdoor temperature together
- Compare similar surfaces in different rooms
- Note cooking, showering, drying laundry and fan operation
- Use the same camera position, scale and measurement location.
- Write down what would count as no change before beginning the check.
Stop boundary
Do not treat persistent wetting, decay, visible electrical damage or extensive material deterioration as ordinary condensation. Correcting humidity does not replace investigation of active leakage. The source set for this guide includes 4 official records selected for this path. They provide general technical and safety context; they do not determine the condition of a particular house.
Primary references for this topic family
These references ground the general building-science or safety context. They do not diagnose a specific house, replace local requirements or certify a repair.
