Moisture may be trapped between window panes
Fogging or droplets that cannot be wiped from either exposed surface suggest a failed insulated-glass seal rather than room humidity alone.
Why this result fits
- The haze remains after both accessible surfaces are cleaned.
- Moisture appears inside a multi-pane glazing unit.
- The problem stays localized to one pane or sash.
What to do now
Confirm location
Check only accessible glass surfaces; do not dismantle the sash.
Photograph changing light
Take photos when the internal fogging is easiest to see.
Report the glazing
Ask maintenance to inspect the insulated glass unit and sash.
Stop and escalate if
- Glass is cracked or loose.
- The sash cannot close or lock.
- Water is also entering around the wall or frame.
What not to do
- Do not drill the glass or frame.
- Do not attempt a defogging kit.
- Do not remove glazing stops or the sash.
Message you can send to maintenance
Fogging or droplets appear between the panes of [window] and cannot be wiped from either accessible surface. Please inspect the insulated glass seal and sash.
Help prevent a repeat
- Document changes over time.
- Report cracked glass or loose sash hardware immediately.
If this does not match
Sources and review date
- Window Types and Technologies — U.S. Department of Energy
Content last reviewed: under the Apartmentwise methodology.