What needs to be clarified
Locate air entry and distinguish window-unit leakage from the frame-to-opening joint, accounting for pressure difference and actual inspection conditions.
Materials to prepare
- Contract, installation detail and window-system instructions
- Installation photographs before finishing and earlier complaints
- Window access and agreed local opening of the lower joint
What to compare
Inspect sash seals and accessible joints; record air and surface temperatures and outdoor conditions. Check localized airflow under a documented pressure difference, comparing the lower detail with other areas. If opened, record sealing continuity and layers. Interpret thermal patterns together with airflow observations.
Possible outcome of the analysis
A diagram of identified air paths and technical description may support targeted recommendations; concealed joints require explicit provisional findings and a defined further opening.
Limits of the conclusions
A cold area in a thermogram is not equivalent to air leakage. Uncontrolled pressure and concealed connections can prevent locating a seal break or defining repairs.