Regular or intermittent drops heard inside a wall, ceiling or cabinet.
Listen for the trigger
Record whether the sound begins with water flow, heating, wind, appliance operation or a change in room pressure.
Locate without unsafe access
Compare rooms and accessible surfaces. Do not open energized electrical equipment or combustion appliances to chase a sound.
Create a useful recording
Capture several seconds before and after the sound, include a spoken location and note the equipment state.
Observe→Distinguish→Control source→Verify
Living dossierPublished knowledge is connected and improved as new cases, images and outcomes are added. Updated 2026-07-20.
