How To Seal UPVC Windows Effectively: Stop Drafts Today

Sealing UPVC windows properly is essential for maintaining energy efficiency and comfort in your home. When windows develop gaps or deteriorating seals, they allow cold air to enter and warm air to escape, leading to increased energy bills and uncomfortable drafts. This guide explores effective methods to seal UPVC windows from the inside.

Why UPVC Windows Develop Sealing Problems

UPVC (Unplasticized Polyvinyl Chloride) windows are popular for their durability and insulation properties, but they can develop sealing issues over time. These problems typically occur due to several factors that affect the window's performance.

The primary causes of seal failure include natural wear and tear, exposure to extreme temperature fluctuations, and improper installation. Rubber seals and gaskets deteriorate over years of use, shrinking and hardening as they age. Additionally, the constant expansion and contraction of window frames during seasonal changes can create gaps between the window and frame, allowing air to pass through freely.

Another common issue is warping or misalignment of the window sash, which prevents it from closing properly against the frame. This creates visible gaps that compromise the window's ability to insulate your home effectively.

Identifying Air Leaks in UPVC Windows

Before attempting to seal your UPVC windows, it's crucial to identify exactly where air leaks are occurring. This ensures you address the specific problem areas rather than applying unnecessary solutions.

A simple yet effective method to detect drafts is the candle test. Hold a lit candle near the window edges and observe if the flame flickers or moves in a particular direction. This indicates air movement through gaps. Alternatively, dampen your hand and move it slowly around the window frame – any cold spots will be immediately noticeable.

Pay particular attention to the meeting points between the window and frame, especially around corners and where opening sections meet fixed parts. In double-glazed windows, condensation between panes indicates a broken seal that requires professional attention rather than DIY solutions.

DIY Sealing Solutions for UPVC Windows

There are several effective methods to seal UPVC windows from the inside that don't require professional assistance. These solutions range from temporary fixes to more permanent solutions depending on the severity of the issue.

Weatherstripping tape is one of the most accessible and effective options for sealing gaps. Self-adhesive foam strips can be cut to size and applied along the frame where the window closes. For optimal results, ensure the surface is clean and dry before application. These strips compress when the window closes, creating an effective barrier against drafts.

Silicone sealant provides a more permanent solution for gaps between the window frame and wall. Soudal offers specialized silicone products designed specifically for UPVC applications. When applying silicone, use masking tape along edges for a clean finish and smooth the bead with a wet finger for a professional result.

For windows with damaged rubber gaskets, replacement seals are available from manufacturers like Rehau, who produce specialized UPVC window components. These push-in gaskets can restore your window's original sealing capability without requiring complete window replacement.

Professional Sealing Options Comparison

When DIY methods aren't sufficient to address serious sealing issues, professional solutions may be necessary. Several companies offer specialized services for UPVC window restoration and sealing.

Service Provider Comparison:

Provider	Specialization	Service Type	Warranty Period
Everest	Complete seal replacement	On-site service	10 years
Anglian	Draught-proofing systems	On-site service	5-10 years
Safestyle	Seal and hinge adjustment	On-site service	10 years

Professional services typically include a thorough assessment of window condition, replacement of deteriorated seals, adjustment of hinges and locking mechanisms to ensure proper closure, and in some cases, the application of specialized sealants not available to consumers.

While professional services represent a higher initial investment compared to DIY solutions, they often provide longer-lasting results and come with warranties that protect your investment. Yale, known for security products, also offers professional window servicing that includes seal replacement and security enhancement in one package.

Maintaining UPVC Window Seals

Proper maintenance can significantly extend the lifespan of your UPVC window seals and prevent the need for frequent repairs. Implementing a regular maintenance routine helps identify potential issues before they become major problems.

Clean your window frames and seals at least twice yearly using mild soapy water and a soft cloth. Avoid harsh chemical cleaners or abrasive materials that can damage the UPVC surface or rubber seals. Products from HG are specifically formulated for UPVC care without causing deterioration to seals or gaskets.

After cleaning, apply a silicone-based lubricant to rubber gaskets to prevent them from drying out and cracking. This maintains their flexibility and sealing properties. WD-40 offers specialized products for this purpose that won't damage UPVC materials.

During your maintenance routine, inspect hinges and locking mechanisms to ensure they're functioning properly. Misaligned hardware can prevent windows from closing completely, creating gaps that no amount of sealing can fix. Adjust or tighten hardware as needed to maintain proper alignment and closure pressure against seals.

Conclusion

Sealing UPVC windows from the inside is a practical and effective way to improve your home's energy efficiency and comfort. Whether you choose DIY solutions like weatherstripping and silicone sealants or opt for professional services, addressing window drafts can significantly reduce heating costs and eliminate uncomfortable cold spots in your home.

Remember that regular maintenance plays a crucial role in preserving seal integrity. By implementing a consistent cleaning and inspection routine, you can extend the lifespan of your window seals and prevent minor issues from developing into major problems. For windows with significant deterioration or damage, consulting with professionals from reputable companies like Everest or Safestyle may provide the most cost-effective long-term solution.

With proper sealing and maintenance, your UPVC windows can continue to provide excellent insulation and performance for many years to come, keeping your home comfortable in all seasons while minimizing energy consumption.

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This content was written by AI and reviewed by a human for quality and compliance.