Home Uncategorized How to Repair Double Glazing Condensation?

How to Repair Double Glazing Condensation?

double glazing windows

Condensation inside double glazed windows is a common issue that can compromise visibility, insulation, and overall comfort within your home. When moisture builds up between the glass panes, it indicates a breach in the window’s seal, allowing outside air and moisture to infiltrate. Addressing double glazing condensation promptly is essential to prevent further damage to your windows and maintain their efficiency. This guide will explore effective methods and techniques for repairing double glazing windows condensation, ensuring to remain clear and functional.

Understanding Double Glazing Condensation

Before delving into repair methods, it’s important to understand the causes and implications of double glazing condensation:

  1. Causes of Condensation
    Condensation occurs when warm, moisture-laden air comes into contact with a cold surface, such as the inner pane of a double glazed window. This often happens due to a compromised seal or poor ventilation.
  2. Impact on Window Performance
    Persistent condensation can lead to mold growth, damage to window frames, and reduced thermal efficiency. It can also obscure visibility through the glass, affecting natural light and views.
  3. Signs of Condensation
    Look for fogging or moisture trapped between the glass panes, water droplets on the inside surface of the window, or signs of mold or mildew around the window frame.

Methods to Repair Double Glazing Condensation

Repairing double glazing condensation involves addressing the underlying causes and restoring the window’s seal and insulation:

  1. Assessment of Window Condition Begin by assessing the extent of condensation and identifying the affected windows. Determine whether the condensation is occurring between the glass panes or on the inside surface.
  2. Identify the Source of the Issue Check for visible signs of damage to the window seal, such as cracks, gaps, or degraded sealant. Inspect the window frame and surrounding areas for any contributing factors, such as poor ventilation.
  3. DIY Repair Methods Depending on the severity of the condensation and the condition of the window, consider the following DIY repair methods:
    • Silicone Sealant Application: Apply a fresh bead of silicone sealant along the edges of the window frame to reinforce the seal and prevent further moisture ingress.
    • Dehumidifier Use: Use a dehumidifier in the room to reduce indoor humidity levels, which can help mitigate condensation issues.
    • Ventilation Improvement: Improve ventilation in the affected area by opening windows regularly or installing trickle vents to allow for airflow.
  4. Professional Repair Options For more severe condensation problems or if DIY methods prove ineffective, consider seeking professional assistance:
    • Seal Replacement: A professional can replace the damaged or degraded seals between the glass panes to restore the window’s integrity.
    • Glass Replacement: In cases where condensation persists due to irreparable seal failure or significant damage, replacing the glass panes may be necessary.

Preventative Measures to Avoid Future Condensation

Implementing preventative measures can help reduce the likelihood of future condensation issues:

  1. Regular Maintenance
    Conduct regular inspections of your double glazed windows to check for signs of wear, damage, or condensation buildup.
  2. Humidity Control
    Maintain indoor humidity levels between 30% to 50% by using dehumidifiers, opening windows when possible, and using extractor fans in kitchens and bathrooms.
  3. Proper Ventilation
    Ensure adequate ventilation throughout your home to allow moist air to escape and prevent it from accumulating around windows.
  4. Professional Inspections
    Schedule periodic inspections by a qualified professional to assess the condition of your double glazed and address any potential issues early.

Step-by-Step Guide to Repair Double Glazing Condensation

Assess the Condition

Start by identifying which windows are affected by condensation. Inspect both the interior and exterior sides of the window to determine the severity of the issue.

Determine the Cause

Check for any visible signs of damage to the window seals, such as cracks or gaps. Also, assess the condition of the window frames and surrounding areas for any contributing factors, such as poor ventilation or excessive humidity levels.

DIY Methods for Repair

Repairing double glazing windows can sometimes be done DIY-style, depending on the nature and extent of the damage. Here are several methods and considerations for tackling common issues with double glazing windows.

1. Condensation Inside the Glass

Condensation inside double glazing is a common issue caused by a breach in the seal between the panes. This occurs when the desiccant (moisture-absorbing material) within the window becomes saturated or the sealant fails. While replacing the desiccant or resealing the window typically requires professional help, there are temporary DIY solutions:

  • Dehumidifiers: Placing a dehumidifier near the affected window can help reduce humidity levels inside the home, minimizing condensation.
  • Ventilation: Improving ventilation in the room can prevent excessive moisture buildup, thereby reducing condensation.

2. Drafts Around the Window

Drafts can occur due to gaps or deterioration in the window seals. Addressing drafts involves identifying the source and applying appropriate fixes:

  • Seal Replacement: Use weatherstripping or caulking to seal gaps around the window frame. Ensure the seals are intact and provide a tight fit.
  • Window Insulation Film: Applying an insulating window film on the interior can provide a temporary solution to reduce drafts and heat loss.

3. Scratches on the Glass

Minor scratches on double glazing can sometimes be polished out using specialized glass polishing compounds:

  • Glass Polish: Apply a small amount of glass polishing compound to the scratched area and buff it with a soft cloth in circular motions until the scratch diminishes.
  • DIY Scratch Removal Kits: Some kits include all necessary materials and instructions for repairing minor scratches effectively.

4. Replacing Window Handles or Locks

Faulty handles or locks can compromise the security and functionality of double glazing windows. Replacing them can often be done without professional help:

  • Identify the Type: Determine the type and size of the handle or lock needed. Many suppliers offer replacement parts that match various window brands and models.
  • Installation: Follow manufacturer instructions carefully. Typically, this involves unscrewing the old handle or lock and installing the new one in its place.

5. Replacing Seals

Over time, the seals around double glazing windows can degrade, leading to leaks and drafts. Replacing these seals can restore the window’s energy efficiency:

  • Seal Removal: Carefully remove the old seal using a putty knife or seal removal tool, ensuring not to damage the window frame.
  • New Seal Installation: Apply a new seal using adhesive recommended for use with double glazing. Press firmly to ensure a tight seal around the entire window.

6. Repairing Fogged Glass

If condensation has led to fogging between the glass panes, repairing it typically requires professional assistance. However, there are temporary measures:

  • Drill Holes for Ventilation: In some cases, drilling small holes at the top and bottom of the affected window can allow ventilation and reduce fogging.
  • Temporary Moisture Absorbers: Placing silica gel or moisture-absorbing packets between the panes can help temporarily reduce fogging.

7. Preventive Maintenance

Regular maintenance can extend the lifespan of double glazing windows and reduce the need for repairs:

  • Cleaning: Clean windows regularly to prevent dirt and debris buildup that can affect seals and functionality.
  • Inspection: Periodically inspect seals, handles, and locks for signs of wear or damage. Address issues promptly to prevent further damage.


Repairing double glazing condensation is crucial for maintaining the functionality, efficiency, and aesthetics of your windows. By understanding the causes of condensation and employing appropriate repair methods, you can effectively restore clarity and insulation to your windows. Whether you opt for DIY solutions or seek professional assistance, addressing condensation promptly is essential to prevent further damage and ensure long-term window performance.

For residents in Glasgow experiencing issues with double glazing condensation, implementing these repair and maintenance strategies can improve home comfort and energy efficiency. By double glazing taking proactive measures and addressing condensation promptly, you can preserve the beauty and functionality of your double glazed windows in Glasgow’s varying climate conditions.