Top Reasons That Cause a Double-Glazed Window to Crack

Homeowners in Ottawa, Canada, appreciate the value of double-glazed windows. They provide energy efficiency, reduce noise, and maintain indoor comfort. Yet, these windows can crack, leading to inconvenience and expense. This guide explores the primary reasons for double-glazed window cracks, along with practical prevention and repair strategies.

The Nature of Double-Glazed Windows

Double-glazed windows, also known as insulating glass units, consist of two glass panes separated by a spacer filled with air or gas. This design offers insulation, reducing energy costs and improving comfort. Each pane in the glazed units plays a significant role in the window’s overall performance and longevity. Despite their durability, several factors can lead to cracking.

1. Manufacturing Defects

While rare, faults can occur during the production of double-glazed glass. Glass spontaneous breakage happens when impurities, such as nickel sulphide, are present in the glass. These impurities might expand over time and cause the glass to crack suddenly. Quality control is vital during the manufacturing process to prevent such issues.

2. Improper Installation

Incorrect installation of double-glazed windows can significantly compromise their longevity, as misalignment or improper fitting can create undue stress on the glass edges, increasing the risk of cracks and breakage. This stress makes them vulnerable to cracking. Always ensure that experienced professionals are responsible for the installation, adhering to industry standards.

3. Thermal Stress

Extreme temperature variations between the inside and outside surfaces of a window can cause thermal stress. Ottawa’s climate, with its hot summers and cold winters, puts double-glazed windows to the test. Thermal stress occurs when one side of the glass expands more than the other due to temperature changes. This uneven stress distribution can ultimately culminate in the formation of unsightly cracks or even catastrophic shattering of the glass pane.

4. Physical Impact

Accidental hits or impacts can also cause window cracks. Although double-glazed windows use tempered glass for added strength, they are still not immune to physical breakage. The impact of flying objects, such as toys, balls, or storm-borne debris, can exert tremendous force on the glass, leading to sudden and unexpected cracking or shattering.

5. Maintenance-Related Issues

Neglecting regular window maintenance can lead to problems, one of which is the growth of mould. Mould can infiltrate the seals around the glass, causing them to weaken over time. Once the seals are compromised, the integrity of the entire unit is affected, potentially leading to breakage.

6. Environmental Factors

External factors such as soil movement and building settling can exert additional stress on double-glazed windows. Over time, this stress could cause a window crack. Homes in areas prone to soil movement should be monitored for early signs of stress.

Preventing Double-Glazed Window Cracks

Taking preventive measures can extend the life of double-glazing. Here are some practical strategies homeowners can implement:

1. Ensure Quality Installation: Hire certified professionals to install windows. Proper installation minimizes stress on the glass and ensures long-term performance.
2. Regular Maintenance: Regular window inspections can help identify potential issues, such as mould growth or seal deterioration, allowing for prompt maintenance and preventing more costly repairs down the line.
3. Thermal Stress Management: Use blinds or curtains to manage indoor temperature and avoid placing high-heat sources close to windows. This reduces the risk of thermal stress, especially during Ottawa’s harsh winters and hot summers.
4. Limit Physical Impacts: Educate family members on the importance of handling windows carefully. To safeguard against accidental damage, it’s essential to establish a safe perimeter around windows, limiting heavy foot traffic, sports, or other high-impact activities that could potentially strike the glass.
5. Monitor Environmental Changes: Stay aware of any structural changes in your home that may impact window stability.

Repair Options for Cracked Double-Glazed Windows

If cracks occur, consider repair options before replacement to save time and money.

1. Repairing Minor Cracks: Small cracks might be repairable using special resins designed for glass repair. This option works on minor cracks that do not compromise the entire window’s structural integrity.
2. Seal Replacement: For issues related to compromised seals, replacing the seal can restore efficiency. A well-maintained seal prevents moisture infiltration and maintains insulation properties.
3. Glass Pane Replacement: When damage is substantial, replacing the affected pane may be necessary. This repair maintains the overall integrity of the double-glazed window unit without needing complete replacement.
4. Professional Assessment: Engage with professionals for an instant response to window damage. They provide assessments, repair options, and replacements if required. Professional services ensure that repairs align with current industry standards.

Choosing the Right Double-Glazed Windows for Ottawa Homes

1. Material Quality: Opt for windows made with sturdy, tempered glass and reliable sealants to manage thermal stress and improve energy efficiency.
2. Customization and Fit: Consider custom solutions that fit your home’s design and climate demands. Proper fit reduces installation-related issues and enhances window performance.
3. Warranty and Support: A comprehensive warranty can offer peace of mind. Check for warranty options that cover manufacturing and installation defects.
4. Energy Efficiency Ratings: Look for windows with high energy efficiency ratings, reducing energy bills and improving indoor comfort.

Benefits of Maintaining Double-Glazed Windows

Beyond preventing cracks, maintaining double-glazed windows provides other home benefits:

1. Energy Savings: Well-maintained windows limit energy loss, helping reduce bills.
2. Noise Reduction: The insulation properties of double glazing also buffer homes from external noise.
3. Enhanced Comfort: Properly installed and maintained windows regulate indoor temperatures, providing a comfortable living environment year-round.
4. Increased Durability: Regular maintenance boosts the longevity of windows, postponing the need for costly replacements.

Immediate Actions When a Crack Appears

Upon noticing a crack, take immediate steps to prevent further damage, such as:

1. Secure the Area: Prevent additional stress by securing the area around the cracked window.
2. Contact Professionals: Contact a window specialist for an evaluation and advice on the next steps.
3. Avoid DIY Repairs: Attempting to remove damaged panes or fix cracks without professional help can worsen the situation or lead to injury.

Conclusion

Double-glazed windows are a smart investment for Ottawa homeowners, providing energy efficiency and comfort. Yet, several factors can lead to their cracking. Understanding and managing these factors is essential for prevention and long-term usability. Whether dealing with manufacturing defects, improper installation, or thermal stress, addressing issues promptly ensures window longevity. By choosing high-quality double-glazing and performing regular maintenance, homeowners protect their investments and enjoy the full benefits these windows offer. If a crack appears, don’t delay in seeking professional guidance to restore your window’s function and appearance.