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How to Stop Condensation on Double-Glazed Windows in Winter

Condensation inside double glazing is proof that your windows are working correctly. But condensation also reduces windows’ lifespan as it encourages mould growth, which can damage the frame. Moreover, it indicates the excess humidity inside your home, which can cause health issues.

Therefore, we are discussing the causes of condensation on the inside of windows and how you can prevent it during the winter.

What causes condensation on double-glazed windows in winter?

The window’s surface temperature is usually cooler than the air inside the room, due to which you will often see condensation in double-glazed windows. Condensation occurs when this warm air comes in contact with the cold air between the panes. The sealant around the double glazing often fails, making the warm air susceptible to entering the gap between the glass panes.

The cold weather outside during winter increases the chances of condensation. The difference in temperatures outside and inside cools your windows more and encourages water vapour to condense on the glass.

Do new windows also cause condensation?

If you install new windows in your older home, it may seal the exterior envelope. Contrary to older windows which often leak and let the house breathe, new windows are usually designed to be airtight. Warm moist air has nowhere to go during the water, resulting in condensation on cold surfaces – quite often on windows.

Can underfloor heating also cause condensation?

Radiators help warm air to rise and also in its circulation. Swapping out your radiators for underfloor heating may result in condensation on the outside of windows.

How can you prevent condensation inside double glazing?

Reducing the amount of condensation in your home generally will help prevent condensation from settling on windows. Humidity levels shall be at around 50% ideally, which can be achieved by improving ventilation in your home:

  • Ventilate rooms
    Open windows for about 20 minutes daily (during winter also) – it helps the damp air escape and dry air to replace it.
  • Use an extractor fan or a dehumidifier
    While cooking or taking a shower, an extractor fan can help remove damp air from your home before it settles on surfaces and causes problems. If even the extractor fan does not sufficiently reduce condensation, you can opt for a dehumidifier which will extract moisture from the air.
  • Avoid drying laundry inside
    Avoid drying wet clothes inside as it significantly increases the water vapour in the air.
  • Rearrange your houseplants
    More houseplants imply more moisture in the air. During the winter, try to move your houseplants outside or keep plants like ferns, cactus or palms inside the house, which absorb humidity.

The other thing you can do to help prevent condensation in double glazing is to regularly check the seals around windows to ensure there are no failures. You can check around the window edges for any gaps in the sealant by running a finger along it. Replace the sealant if you find any breakages in the sealant.

Bottom line

Condensation on windows is normal, but excessive moisture can damage your window frames and, thus, reduces the lifespan of your double-glazed windows. Therefore, reducing extreme humidity during winter becomes essential to keep your windows free from condensation.

If you are looking for new windows for your home, we supply a variety of uPVC windows and composite windows. Just get in touch with our team if you have any queries.

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