Garage condensation concentrated on an uninsulated metal door
Moisture formed on the coldest metal surface during rapid warming, while walls and roof remained dry.
Water droplets on the inside of a garage door
Surface condensation on cold metal
Moisture sources were reduced, ventilation improved and the door insulated.
Surface temperatures rose and condensation frequency dropped sharply.
The evidence that separated the cause
Supporting clues
- Only on metal
- Rapid thaw periods
- No roof moisture path
Checks performed
- Surface/dew-point comparison
- Humidity log
- Visual pattern map
Field lessonMaterial and surface temperature can explain a pattern without a leak.