How To Clean & Maintain A Velux Window

To increase the longevity of your VELUX roof windows and keep them in good condition, you need to make sure that they are properly cleaned and maintained. In this guide we will share some of the ways you can ensure that you are achieving the best performance out of your VELUX windows.

This guide primarily applies to manually operated centre pivot VELUX roof windows. Cleaning and maintenance procedures may differ for electric or solar-powered models, as solar windows do not require wiring checks, but may need battery replacements over time.

We will describe how to clean your VELUX windows, as well as how to maintain or replace the air filter, flap foam and pivot hinge springs. We will also explain how to repair damage to your VELUX white painted roof windows, and will share some useful general maintenance tips.

To clean the outer window glazing/panel, simply rotate the sash 180 degrees (See Fig. 1) and secure it in position by sliding the barrel bolt into the bushing at the bottom of the side frame (See Fig 2). This is an excellent safety feature that ensures hands-free cleaning. You can then proceed to clean the window using a soft, clean, lint-free cloth/chamois, leather/non-abrasive sponge or a clean, non-metal window squeegee.

While clean water will normally be sufficient for cleaning the pane, if required, use a small amount of mild, non-abrasive household detergent diluted in water. The use of excessive chemicals should be avoided.

• Avoid contact from silicone with the pane, as it can permanently damage the coating on the glazing.
• Do not use any cleaning products containing abrasive particles.
• Do not use chemical products for cleaning the pane.
• 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.
• Clean the external pane every 3-6 months (or more in coastal/urban areas).
• Clean the internal pane as required.

The air filter on your VELUX window can be removed and washed with ordinary household cleaners. Clean air filters help with dust reduction, allergens and airflow efficiency, improving indoor air quality.

Simply fully rotate and secure the window into the cleaning position, then remove the filter from the filter rail (See Fig. 3).

If your air filter needs to be replaced, use the old filter to measure the correct length and cut the new filter to size (See Fig. 4). Then simply insert your new VELUX air filter back into the filter rail.

• For best performance, VELUX air filters should be replaced every 6-12 months, or more frequently in dusty or high-pollution areas.

Replacing the VELUX ventilation flap foam (otherwise known as vent bar foam) on your ageing window can help reduce draughts, improving their overall thermal performance. This is especially useful for older windows (15+ years).

To do this you need to rotate your window and unlock the vent bar mechanism (see Fig. 5 & Fig. 6).

Then you need to remove the screws and, using a scraping tool, gently remove the old flap foam. Once all of the foam has been removed you can sand the area to remove any excess adhesive to ensure a smooth application. Measure your new piece of flap foam against the vent bar and cut to size (See Fig. 7). Remove the backing from the new piece of vent bar foam and gently smooth it into place. Finally, reattach the vent bar mechanism and the window is now ready for use.

Over time, pivot hinge springs can become damaged or worn. To replace these simply rotate the sash 180 degrees and secure it in position. Using a screwdriver, remove the old pivot hinge springs (See Fig. 8). This should be relatively easy to do as the springs should fall out once unclipped from the mechanism. Take the replacement pivot hinge spring and slot it into the mechanism. It can be firmly locked into place using a screwdriver (See Fig. 9).

• If you are unsure or uncomfortable carrying out this repair, we recommend contacting a professional installer.
• Spring types vary by window size and age, and users should check the type plate before ordering parts.

We sell a VELUX Repair Kit that is designed to repair blemishes and scratches to a window frame. This repair kit is suitable for VELUX white painted roof windows only, and is not compatible with polyurethane (maintenance-free) frames.

The kit contains 220ml of white wood lacquer, allowing you to repair most types of frame damage. If there is both paint and surface damage however, you will also need to use a filler.

The first thing you need to do is apply masking tape to protect the glass. Next, use sandpaper to carefully rub back the painted surface and then remove any debris or dust from the sanded surface with a clean, damp cloth.

Wait for the surface to completely dry and then you can use the paint and a small roller to create a smooth and clean finish. Wait for the paint to dry and then apply another coat. Once the paint has dried, carefully peel off the masking tape and your window will look as good as new.

All VELUX roof windows have a type sign stating exact information about the window. This can be vital when making repairs. You can find this in the right corner of the top sash, behind the ventilation flap.

VELUX recommends that you lubricate fittings and hinges at least once a year. This includes the pivot hinge and lock. Simply apply the lubricant to the areas and close the window.

For electric windows, it is recommended that the gas springs and motors are replaced within 10 years after installation of the window as their performance is likely to decline slightly over the years.

If you live in an area that is susceptible to prolonged cold periods with heavy snowfall, you must ensure that you have an adequate drainage system to cope with excess water. When the temperature begins to rise, your windows will often be one of the first places where the snow and ice will start to melt. Don’t forget to clean the flashing around your windows. Leaves and other debris should be removed from the flashing once per year to allow excess rainwater to flow freely.

When you start to notice that condensation is forming on the glazing of your windows, this may be a warning sign that you should ventilate more often. Persistent condensation between panes may indicate a failed glazing unit and should be inspected.

Regular ventilation is the most efficient way of preventing condensation from forming on your window glazing. To limit the amount of humidity in your house, be sure to ventilate regularly by opening your VELUX windows for five minutes, preferably daily.

• Clean glazing and frames
• Check and clean air filter
• Lubricate hinges and locks
• Clear flashing and drainage channels
• Inspect seals and vent foam