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Exterior dew on several replacement windows at once
How do you tell ordinary morning dew on the outside glass from something worth asking the installer about? I’m especially curious whether the timing matters: if it’s on the outdoor surface early and clears as the day warms, is that generally different from moisture that stays put?
I’d also want to distinguish surface dew from fogging between the panes, and know whether seeing it on several windows versus just one changes what you’d look into. Does exterior condensation by itself say anything reliable about the glazing or installation?
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2 replies
If you can wipe the moisture off the outside, that helps distinguish surface dew from fog between the panes. Fog that stays trapped between panes is worth asking the installer about as a possible sealed-unit issue. But dew on the exterior that clears as the day warms isn’t, by itself, evidence of a glazing or installation defect.
Dew on several windows at once doesn’t automatically point to a shared installation problem. Exterior dew forms when the glass cools below the outdoor air’s dew point, and windows with similar exposure can all do that together. How it changes as the day warms is more informative than the count; exterior dew alone can’t establish a glazing or installation defect.