Thermal imaging (drain leak)

Thermal imaging uses an infrared camera to visualise temperature variations on surfaces, helping to identify damp patches, cool spots from cold water leaks and warm trails from hot supply or heating pipes. While not a direct drain inspection technique, it is a useful screening tool for tracking the visible extent of a leak before drilling or opening up. In London flats and Victorian terraces, thermal imaging is often used to support diagnosis where a leak appears in a ceiling or wall and the suspected source could be drainage, central heating or roof penetration. Engineers interpret the images alongside moisture meter readings and CCTV inspection of any associated drainage. The technique is carried out by qualified surveyors using calibrated equipment, with findings cross-checked before any invasive investigation.