Leaking uPVC Windows: Causes, Effects, and Effective Solutions

Leaking uPVC Windows: Causes, Effects, and Effective Solutions


Leaking uPVC windows can be a frustrating problem for homeowners, especially when the winds are blowing off the Irish Seas towards Blackpool and Preston.  Not only do they compromise the comfort of your living space, but they can also lead to water damage, mold growth, and increased energy bills. In this blog post, we will delve into the causes of leaking uPVC windows, discuss the potential effects they can have on your home, and provide you with practical solutions to fix the issues.


Understanding the Causes of Leaking uPVC Windows


Leaking uPVC windows can be a frustrating problem for homeowners, leading to water infiltration, discomfort, and potential damage to the property. To effectively address this issue, it is crucial to understand the underlying causes. Here are some common factors that contribute to leaking uPVC windows:


  1. Poor Installation: Improper installation is a primary cause of window leaks. If the uPVC windows are not fitted correctly, gaps and spaces may form between the frames and the surrounding structure. This allows water to seep through during heavy rains or windy conditions, resulting in leaks.
  2. Deterioration over Time: uPVC windows are exposed to various weather elements such as sunlight, rain, and temperature fluctuations. Over time, this exposure can cause the uPVC material to deteriorate, leading to weakened seals and gaskets. When the seals become compromised, water can enter through the gaps, causing leaks.
  3. Faulty Seals and Gaskets: Seals and gaskets play a crucial role in maintaining the water resistance of uPVC windows. They create a barrier between the frames and the glass, preventing water from infiltrating the interior. However, seals and gaskets can become damaged, warped, or worn out over time, compromising their effectiveness and resulting in leaks.
  4. Inadequate Maintenance: Regular maintenance is essential to keep uPVC windows in optimal condition. Neglecting proper care, such as cleaning and lubrication, can contribute to window leaks. Accumulated dirt, debris, or corrosion can affect the window’s performance, leading to gaps or weakened seals that allow water to seep through.
  5. Structural Settlement: Buildings naturally settle over time, which can cause the frames and openings to shift slightly. This movement can create gaps or misalignments in uPVC windows, allowing water to enter and causing leaks.
  6. Extreme Weather Conditions: Harsh weather conditions, such as heavy rains, strong winds, or storms, can put additional stress on uPVC windows, with living in Blackpool and the Preston areas we can understand these extremes of weather. If the windows are not designed to withstand such conditions or are already weakened due to age or poor installation, they may be more prone to leaking.


Understanding these causes of leaking uPVC windows can help homeowners identify the source of the problem and take appropriate measures to address it. By tackling the root causes, such as improving installation, replacing damaged seals or gaskets, and maintaining regular upkeep, homeowners can effectively resolve the issue of leaking uPVC windows and ensure a dry and comfortable living environment.


Effects of Leaking uPVC Windows:

Ignoring leaking uPVC windows can have serious consequences for your home. Here are some potential effects of window leaks:

  1. Water Damage: Water infiltration can lead to damage to your walls, flooring, and furniture. It can weaken the structural integrity of your home and create an environment conducive to mold growth.


  1. Mold and Mildew Growth: Excess moisture from leaking windows can create a breeding ground for mold and mildew. These fungi can cause health issues and further damage to your property.


  1. Energy Loss: Leaks allow air to enter and escape, compromising the energy efficiency of your home. This can result in higher heating and cooling costs as your HVAC system works harder to maintain a comfortable indoor temperature.


  1. Reduced Comfort: Leaking windows can create drafts and cold spots near the affected areas, making your living space less comfortable.


Effective Solutions for Fixing Leaking uPVC Windows:

Now that we understand the causes and effects of leaking uPVC windows, let’s explore some practical solutions to address the issues:


Leaking uPVC windows can be a frustrating problem that compromises the comfort and integrity of your home. Fortunately, there are effective solutions available to address and fix the issues. In this blog post, we will explore practical remedies to resolve leaking uPVC windows, ensuring a dry and secure living space.


  • Inspect and Repair Seals:

The seals and gaskets around your uPVC windows play a critical role in preventing water infiltration. Begin by thoroughly inspecting these components for any cracks, gaps, or signs of wear. If damaged, replace them with new ones specifically designed for your uPVC windows. This simple step can often fix minor leaks and restore the window’s water resistance.


  • Replace Weatherstripping:

Weatherstripping is essential for creating a tight seal between the sash and frame of the window. Over time, weatherstripping can become damaged or worn, leading to leaks. To fix this issue, remove the old weatherstripping and install new, high-quality weatherstripping. Ensure that it fits tightly and securely to effectively seal the window.


  • Seal Gaps and Cracks:

Inspect the areas around the window frames for any gaps or cracks that could be causing leaks. Use an appropriate sealant, such as silicone-based sealants, to fill these openings. Clean and dry the surfaces thoroughly before applying the sealant. Properly sealing the gaps and cracks will create a watertight barrier, preventing water from entering your home.


  • Adjust Window Alignment:

Misaligned uPVC windows can create gaps that allow water to seep in during heavy rains or strong winds. Check the alignment of your windows and adjust them if necessary. Follow the manufacturer’s guidelines or consult a professional for proper realignment. By ensuring a proper fit, you can minimize the chances of leakage.


  • Replace Damaged Glass Units:

If you notice condensation or fogging between the glass panes of your uPVC windows, it indicates a damaged or failed glass unit. In such cases, replacing the glass unit is necessary to prevent further leaks and improve energy efficiency. Contact a window professional or uPVC window installer to assess the situation and replace the damaged glass unit.


  • Check and Unblock Drainage Channels:

uPVC windows are equipped with drainage channels that allow water to escape from the frames. Over time, these channels can become clogged with debris, obstructing proper water drainage and leading to leaks. Regularly check and clear any obstructions to ensure efficient water flow and prevent leaks. Use a soft brush or compressed air to clean out the drainage channels.


  • Maintain Proper Window Care:

Regular maintenance is crucial for preventing leaks and prolonging the lifespan of your uPVC windows. 


Follow these maintenance tips to keep your windows in optimal condition:


Clean the window frames, sashes, and glass regularly using a mild detergent and non-abrasive cloth.

Lubricate the window hinges, locks, and handles annually to ensure smooth operation.

Inspect the condition of the seals, gaskets, and weatherstripping periodically and replace them if necessary.

Keep the window tracks clean and free from debris to prevent obstruction and ensure proper functionality.


  • Seek Professional Assistance:

If the leaking issue persists or seems complex, it is advisable to seek professional help. Window experts or uPVC window installers have the knowledge and expertise to diagnose the problem accurately and provide appropriate solutions based on their experience. They can conduct a thorough assessment, identify underlying issues, and offer tailored remedies to fix the leaking uPVC windows effectively.


With an office in Blackpool to help cover the Fylde Coast as well as being able to cover Preston and the surrounding area, give us a call and we can talk through your specific needs and requirements

If you’re interested in replacing a window for your home, take a look at our New Window packages. Alternatively, just take a look at our other services for more!

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