A ceiling stain is a symptom, and the cause may be the roof, a supply pipe or a drain above it. Crews in Harvard trace the source with meters before cutting, because opening drywall in the wrong place wastes effort and widens the damage.
Roof or pipe, and how crews decide
A stain that grows after rain or snow melt points to the roof, while one that appears in dry weather, below a bathroom or near a kitchen, points to plumbing. Thermal imaging and pin meters narrow it down, and the crew writes the pattern into the notes for the adjuster.
- Stain compared across dry and wet weather
- Thermal camera scans the ceiling surface
- Pin meters probe the joist bays above
- Floor or attic above inspected for the source



