Facade staining caused by a loose gutter joint
The vertical stain aligned exactly with overflow during heavy rain and stopped after the joint and fall were corrected.
✓Owner Reportedrecorded confirmation level
01 / OBSERVED
→Dark vertical stain on exterior wall
02 / CONFIRMED CAUSE
→Leaking gutter joint
03 / REPAIR
→The joint was renewed and the gutter fall adjusted.
04 / VERIFY
The facade remained dry during heavy rain before cleaning and repainting.
WHAT CHANGED THE DIRECTION
The evidence that separated the cause
Supporting clues
- Vertical line below joint
- Heavy-rain trigger
- Visible overflow
Checks performed
- Rain observation
- Gutter water test
- Facade drying check
Field lessonObserve the building during the trigger when it is safe to do so.
