VELUX After Care

22nd October 2021
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22nd October 2021

Do you ever advise customers how to maintain their VELUX windows after install?

Here is some handy information you could share with them:

Clean the window

Rotate the sash fully and secure it by engaging the sash barrel bolt into the bushing at the bottom of the frame. This allows both hands to be free for cleaning.

To rotate a top hung window, first lift the handle at the bottom, so it’s pointing upwards (but don’t let the window open from the bottom) then pull down on the ventilation bar at the top. The window should now rotate in the centre pivot function and can be secured with the barrel bolt in the same way as the centre pivot windows.

Air filter

The air filter can be removed and washed in household detergent.

Fully rotate and lock the window in the cleaning position, then remove the filter from the filter rail.

New filters are available from VELUX.

Maintenance of timber windows

The timber has received basic treatment – as well as the finished coating at the factory – and can be cleaned with a household cleaner.

Further treatment advice is as follows:

  • Pine – every four years, and whenever required
  • Paint – every seven years and whenever required
  • Windows exposed to strong heat, strong sunlight and/or high levels of humidity (e.g., in kitchens or bathrooms) must receive treatment at least every two years

For more information on our maintenance kits please click here UK | Ireland

Surface maintenance

Remove surface treatment (varnish or paint). Ensure the surface is clean and dry and apply primer to the timber.

When dry, apply a coat of water-based acrylic/paint (always follow the manufacturer’s directions).

Apply the same method to the affected areas if the varnish or paint is damaged.


It is recommended that non-corrosive grease be applied once a year to all headlocks.

Cleaning the flashing

Leaves and other debris should be removed from the flashing once a year to allow rainwater to pass freely.

Minimising condensation

Condensation is usually more noticeable on roof windows and flat roof windows because warm, moist air rises to the ceiling. The problem, however, usually isn’t the roof window. It’s the excess moisture in the room.

Condensation is more prevalent in new homes. After a few years, new homes tend to dry out and have less moisture problems. Eliminating excess moisture by using a dehumidifier and providing adequate ventilation and air circulation will go a long way in preventing condensation.

Installing roofing underlay between the roof window frame and roofing material will help prevent condensation on the cladding.

For more information and tips on condensation, please visit our full article UK | Ireland.

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