Why is there fogging on the inside of the glass?

Fogging may occur on the inside (room side) of the glass.

Common causes are:

  • Excessive indoor humidity and poor ventilation (especially in new buildings)
  • Low temperature indoors
  • Poorly insulated panel

Interior fogging is not a sign of a defect in the pane.

In cold periods, we (and most other window manufacturers) have received a number of enquiries regarding condensation that froze on the inside. We have therefore asked our glass suppliers to provide us with some information about this.

Information about interior fogging.
Information about fogging on the outside of the glass
Information about condensation and icing on the cylinder sets for doors in winter.
NorDan's new NTech products and installation suggestions for better, more proper installation of windows in walls