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Care and maintenance

Make your VELUX window last a lifetime by taking good care of it, inside and out.

Download guides for roof window use and maintenance

Download the care and operating instructions for your roof window as a PDF here. To do this, you need some information that you can find on the type plate of your VELUX roof window.
Roof windows - wood (GGL/GGL62/GPL/GHL/GLL/GZL/GTL/GXL/GFL)
Roof windows - polyurethane (GGU/GPU/GHU/GLU/GTU/GXU)
Special function (GDL/GEL)
For historical buildings (GVO/GVR) and uninhabited spaces (GVT)
Type design

How to identify your VELUX roof window:

All VELUX roof windows produced after 1968 have a type sign stating exact information about the window. You can find this in the right corner of the top sash, behind the ventilation flap.

1. Type
2. Size
3. Variant
4. Production code

Buy a maintenance kit
Easily extend the life of your VELUX roof window with our maintenance kit. One kit allows you to maintain 2 to 5 roof windows in wood or polyurethane finish.
Buy online
Wood maintenance

Wood maintenance

During the manufacturing stage, the timber has received basic treatments and a final coating which can be cleaned with ordinary household cleaners. The timber must receive further treatment at least every four years. Windows exposed to extreme heat, excessive sunlight, and/or high levels of humidity (e.g., in the kitchen or bathroom) must be treated at least every two years.
Wood maintenance painting

Surface maintenance

Remove surface treatment (varnish or paint). Ensure surface is clean and dry and apply primer to the timber. When dry, apply a coat of waterbased acrylic varnish or paint (always follow the manufacturer's directions). Apply the same method to the affected areas if the varnish/paint is damaged. VELUX offers a repair kit with original repair varnish or paint. When you treat the wood, it is important to cover the gaskets to prevent varnish/paint rubbing off on the gaskets, as this will make the gaskets stiff/hard and spoil their effect.
Cleaning the pane

To clean the outer pane, rotate the sash 180 degrees. The sash must be secured in position by sliding the barrel bolt into the bushing at the bottom of the side frame. This safety feature leaves both hands free for cleaning. Clean the pane with a soft, clean, lint-free cloth/chamois leather/non-abrasive sponge or a clean, non-metal window squeegee.

Clean water will normally be sufficient for cleaning the pane. Ordinary, non-abrasive household cleaners can also be used. Soft water is best for cleaning panes. Therefore, in hard-water areas add a small amount of detergent to soften the water or wipe off all excess water after cleaning.

Avoid contact with the pane from all sharp or abrasive objects, including jewellery.

Cleaning the Pane

Tips

  • Avoid contact from silicone with the pane
  • Do not use any cleaning products containing abrasive particles
  • Avoid contact with the pane from all sharp or abrasive objects including jewellery
  • Never attempt to clean off dirt on the pane without first applying water
  • If any works are taking place in the vicinity of the pane, protect the pane with a clean plastic sheet to prevent any splashes or staining from aggressive and abrasive compounds
Cleaning the air filter guy

Cleaning the air filter

The air filter can be removed and washed with ordinary household cleaners. Fully rotate and secure the window in cleaning position, then remove the filter from the filter rail. New filters are available and can be bought in the VELUX e-shop as part of our maintenance kits (ZZZ 220).
Man cleaning the flashing

Cleaning the flashing

Leaves and other debris should be removed from the flashing around the window once per year to allow rain water to flow freely.
Snow and ice

Snow and ice

In areas with prolonged cold periods and heavy snowfall, snow and ice may accumulate on your VELUX roof window for long periods.

When the temperature rises, the window will often be one of the first places where the snow and ice starts to melt.

It is important to make sure that water can always drain off from the roof and surrounding gutters.

Condensation woman ventilation

Condensation

When condensation forms on the glazing of your windows, you should take it as a warning sign that you should ventilate more often. Regular ventilation is the most efficient way of preventing condensation water from forming on your window glazing.

Limit the amount of humidity:

  • If possible, do not dry your laundry inside the house.
  • Close the doors of kitchens and bathrooms.
  • Ventilate regularly for five minutes at least three or four times a day.
  • If possible, maintain a constant room temperature of at least 20°C.
Woman looking out the window

Electrical roof windows

After 10 years, it is recommended that both the gas springs and motors should be replaced. This is to prevent the risk of malfunction and to improve performance.