Which situation matches?
Moisture wipes off inside
Record indoor moisture sources and ventilation. Dry the sill and review bathroom or kitchen exhaust use.
Fog is between panes
Ask the window manufacturer or installer to inspect the sealed unit.
Water appears during rain
Inspect only safely accessible drainage openings. Persistent rain entry needs a professional assessment of seals and flashing.
Prepare for the next step
Soft cloth, humidity meter if available, and notes on weather, room use and which glass surface is wet.
Record when the symptom began, what changed and which observations you can make safely. Do not dismantle equipment simply to provide a more detailed description.
Follow the full guide
Why water forms on your windows
The full guide explains the safe procedure, mistakes to avoid, professional stopping points and prevention. Browse supporting publisher tutorials, or use the moderated Q&A for a non-urgent question.
Sources and limits
- Andersen: Product, Care and Maintenance Information
- EPA: A Brief Guide to Mold, Moisture and Your Home
Documentation checked November 4, 2026. AI-assisted educational content; no property inspection or licensed professional review is claimed.