Interior surface
Often connected to indoor humidity, outdoor temperature and limited warm-air circulation.
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Glass & energy · 1 min read
Condensation: identify which surface is wet
Interior, exterior and between-pane condensation have different causes and next steps.
At a glance
Exterior surface
Can occur when efficient glass becomes cooler than humid outdoor air.
Between panes
Persistent moisture inside a sealed glass unit requires product review.
The useful decision
Interior, exterior and between-pane condensation have different causes and next steps.
Locate the moisture
Interior-surface moisture often relates to indoor humidity and cold weather. Exterior condensation can occur on efficient glazing under certain conditions. Moisture between sealed panes may indicate a glazing concern.
Record conditions
Note outdoor temperature, indoor humidity, room, time of day, window-covering position and whether ventilation is operating.
Ask for help when needed
Persistent moisture, staining, leakage during rain or between-pane fogging should be documented and reviewed. Condensation should not be diagnosed from a photograph without context.
Bring this to the conversation
Project checklist
- Identify the exact surface where moisture appears.
- Record indoor humidity and outdoor temperature.
- Open coverings and confirm ventilation is operating.
- Photograph persistent fogging, staining or rain-related leakage.
Avoid assumptions
Questions worth answering
- Is moisture inside, outside or between panes?
- Does it occur during cold weather, after showers or during rain?
- Are blinds, curtains or furniture restricting air movement?
Continue with trusted information
Useful resources
Before final selection
Ask a product question
Confirm the exact product, current documentation, applicable codes and project conditions with the appropriate project professionals and Morrison team.
