
General Information
The phenomenon of surface condensation on double-glazed units occurs in three forms:
• On the external face (face 1)
• On the inner surfaces 2 and 3 of the double-glazed unit
• On the internal face or face 4.



Condensation on the internal face (4)
the external climate, which is ever-changing.
Condensation on the external face (1)
The surface temperature on the outside of glazing is dependent on:
-The heat exchange by convection with the external air
-Heat loss by radiation mainly to the sky.
rarely occurs on the external face
Condensation on inner faces 2 and 3
•Temporary condensation occurring:
-In areas where there are short, heavy spells of humidity (e.g. bathrooms)
-During exceptionally cold weather
• Is normal. This condensation should not be permanent.
What is condensation?

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