Understanding Window Seal Failure
Your double or triple-glazed windows do more than just provide a view outside — they also form an important part of your home’s thermal efficiency. One critical element that ensures their performance is the seal around each glass unit. But over time, these seals can degrade, leading to issues like condensation, heat loss, and even higher energy bills.
What Causes Window Seals to Fail?
Window seals are subjected to a variety of environmental pressures in the UK, particularly with our regular cycles of rain, frost, and direct sun. Common causes of seal failure include:
- UV exposure: Sunlight weakens the sealant material over time.
- Fluctuating temperatures: Expansion and contraction due to seasonal changes can break the seal bond.
- Poor installation: Incorrect fitting can cause uneven pressure, stressing the seal.
- Old age: Even the best sealants break down eventually, typically after 15–20 years.
How to Spot the Signs Early
Stay vigilant and you can catch the warning signs of failing window seals before more serious problems develop. Here’s what to watch out for:
1. Condensation Between the Panes
This is the most obvious sign. If moisture is getting between the two panes of glass, it’s likely the seal has broken and is no longer insulating properly.
2. Foggy or Misty Glass
Even if there’s no visible water droplets, a hazy or cloudy appearance inside the glass unit suggests moisture penetration — another indicator of seal failure.
3. Drafts or Cold Spots
If your windows feel cold to touch in winter or you sense a draught, degraded seals may be allowing heat to escape and cold air to creep in.
4. Increased Energy Bills
Windows that don’t insulate efficiently can lead to more frequent heating use — which may show up as a gradual but persistent rise in your energy costs.
5. Unexpected Noise
Sound insulation also relies on the integrity of your window units. If outside noise seems louder than usual, the seals might not be doing their job.
Why Timely Maintenance Matters
Failing to address early signs of window seal degradation can lead to more expensive problems, like internal water damage or mould. By keeping your windows well-maintained and replacing units when necessary, you’ll preserve energy efficiency, enhance comfort, and protect your property’s structure.
Need Help Assessing Your Windows?
If you’re noticing any of these signs or just want peace of mind about your window performance, Roofriendly’s friendly experts can help. We serve homeowners across Lincolnshire and Nottinghamshire with professional advice and top-tier installation services.