A ceiling leak has two usual sources: water entering through the roof, or water escaping from plumbing in the floor above. The crew sorts out which one before opening drywall, because the source decides the water type and who repairs the leak.
Reading the stain
A brown ring that grows after rain points toward the roof, while a stain that grows on dry days points toward a supply pipe or a drain upstairs. A sagging ceiling is urgent, because trapped water adds weight, so the owner keeps people out of that room and the crew relieves the bulge through a small controlled opening.
- Mark the edge of the stain with a pencil and the date.
- Check the room above for wet floors, tubs and fixtures.
- Move furniture and electronics out of the drip zone.
- Photograph the ceiling in daylight and again with a flash.



