Windows are often where homeowners notice it first because glass does
not absorb moisture. The location of the moisture - outside, inside, or
between panes - tells you what is most likely happening.
Start with one simple check: determine which surface of the glass
is wet before assuming there is a window problem.
What condensation actually is
Common household condensation, sometimes described as
window “sweating,” occurs when water vapor in the air contacts a
surface cold enough for that vapor to change into liquid droplets.
1. Occasional fog or droplets can be normal.
Short-lived condensation during weather changes, cooking, showers,
or the beginning of heating season may simply reflect temporary
humidity and temperature conditions.
2. Persistent or excessive moisture deserves attention.
Repeated heavy condensation, frost, peeling paint, damp trim, or
moisture spots on walls and ceilings can indicate that indoor humidity
is too high or that another building or HVAC condition needs
evaluation.
3. The window is often the indicator, not the source.
Because glass is non-porous and often cooler than surrounding
interior finishes, it is one of the first places excess airborne moisture
becomes visible.
