From time to time, we receive queries about the appearance of external condensation on glass of replacement windows that we have installed. Our customers in Bury St Edmunds, Suffolk are always reassured when we explain that this phenomenon is a natural occurrence and not a fault in the glass or window product.
Moisture condenses out of the air onto a cold surface that is said to be below the dew point (i.e. temperature at which water vapour becomes liquid). The dew point varies with the air temperature and the amount of moisture it contains. Particularly in spring and autumn, the glass temperature can fall to a low level during the night and the dew point can be comparatively high in these seasons. The glass temperature can be below the dew point under these conditions and moisture can condense onto the surface.
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