Maintenance is simple and does not take long, and here you get tips on how to best take care of NorDan products.


A NorDan window that is properly installed will work correctly, year after year. However, there may be minor factors that make the window go a little slower than necessary, such as paint on the locking pins in the corners and/or on the locking tongues. This paint can be removed, and it helps to apply a thin lubricating layer of Vaseline on the locking bolts and locking tongues so that they slide better.


It is uncommon for a NorDan window to leak; however, if this occurs, it is usually due to a minor factor, such as paint on the frame sealing. It is also possible that the window was closed before the paint or stain was dry, and that some of the paint or stain was left on the seal when it opened.

Operator errors (three-way window)

Very rarely, operator error of the window may occur. The top of the frame may descend, but remain stuck on the ball fitting in the right-hand corner. When this happens, there is no danger that the window may fall out of the frame and into the room.

What should I do?

  • First, ensure that the bottom handle is in the completely open position.
  • Raise the frame with your left hand back into place on the bottom sill and close the bottom handle.
  • Then close the window in the usual way from the ventilation (open at top) position.

Fogging: First, let us establish that fog on the window does not necessary mean that there is something wrong with the glass.

Exterior fogging

With modern, high-insulating, energy-saving insulating glass, in rare cases the opposite problem can occur: glass windows that fog on the outside.

The advantages of these panes, however, are so great that they should be used wherever possible. The new building codes require windows with good U-value in new buildings. Less heating means less exhaust and less pollution, and also reduces costs. In addition, equally as important, a pleasant indoor climate is obtained. Because cold radiation and drafts are eliminated, furnishings can be placed near the windows with far greater comfort.

There are some simple steps that can prevent fogging on the windows:

  • Maintain a steady, normal temperature.
  • Ensure good ventilation, preferably through circulating airflow.
  • Heat sources should be placed under the windows.
  • Ensure that air circulation against the window glass is not hindered by curtains, blinds or large, protruding flower boxes.

Fogging on insulated glass

First, let us establish that if there is fog on the inside of an insulated pane, this does not necessary mean that there is something wrong with the glass. If, however, fog between the panes of insulating glass is a sign of damage, and that the window must be replaced.

There are several things we can do to prevent fogging. First and foremost, indoor moisture should be kept at a reasonable level. Cold rooms such as bedrooms are particularly prone to fogging on the windows. Through perspiration and breathing, a great deal of moisture is generated which then collects on the coldest surfaces — i.e., the windows.

A good hygrometer will be of good help to keep an eye on indoor humidity. The relative humidity should be at somewhere between 30% and 40% in the living room; however, this level can exceeded significantly for short periods in damp rooms.

Aluminium glazing. This is done to facilitate maintenance.

There is no visible difference between stained or painted wood and aluminium. Do not paint the fittings and glass! NorDan windows are easy to paint. Unscrew the handles and valve. Do not allow paint to get on the frame sealing. Use masking tape on the glass - it saves a lot of work.

The most exposed
Paint, stains and varnishes

The windows are the part of the outer wall that can be most difficult to maintain. This is because they are most exposed to the changes in humidity between the inside and outside, in addition to being exposed to strong sun and rain.
Do not paint on wet windows! When they come from the factory, the windows have a moisture content of about 12%,

dry enough that one can paint/stain without further drying. Note, however, that during construction the windows may have absorbed moisture and must first be allowed to dry out before painting/staining. For later maintenance, see separate sheet: Standard paints, stains and varnishes for ND Main Doors Installation and User Manual for ND Main Doors