WHY DO MY ROOF WINDOW PANES FOG UP ON THE OUTSIDE?
When moisture contained within warm air meets with a surface that is cold enough to turn it back into a liquid (condensation), windows can become foggy.
The significant difference in temperature is the reason that windows become especially foggy in the winter.
Condensation on the outside of new windows does not mean they are faulty. It is simply the windows doing their job of keeping your home more energy efficient.
All VELUX windows have an anti-dew coating which is designed to lower the scale of this phenomenon to a degree but will not be able to completely prevent some fogging when temperature difference is great and air humidity is high.
During the Autumnal and Winter months the phenomenon of condensation on the outside of your new windows and doors will be more frequent.
Should fogging occur between the glass panes, then please contact VELUX directly, as this may result in decreased insulation efficiency of your window and may require the pane to be replaced. All VELUX windows come with a 10-year warranty.
