Skylights are a wonderful way to bring natural light into your home, but when the glazing (the clear material covering the skylight) becomes cracked or broken, it can cause serious issues. Broken or cracked glazing not only compromises the structural integrity of the skylight but can also lead to leaks, water damage, and loss of energy efficiency. In this article, we’ll discuss the causes of cracked or broken glazing, how to repair it, and when it’s time to replace your skylight.
What is Skylight Glazing?
Glazing refers to the transparent or translucent material used in a skylight, typically made from glass, acrylic, or polycarbonate. This material is the protective layer that allows light to enter while keeping the elements outside. Over time, the glazing may become damaged due to various factors, and understanding how to address this damage is key to maintaining your skylight’s performance.
Common Causes of Cracked or Broken Skylight Glazing
Weather Extremes
Skylights are exposed to the full force of the elements, including heat, cold, rain, snow, and hail. Temperature fluctuations can cause glazing materials to expand and contract, leading to cracks or breaks over time. Severe weather conditions like hailstorms can directly impact the glazing and shatter it.Physical Impact
Objects falling onto the skylight, such as tree branches or debris from high winds, can cause the glazing to crack or break. The impact may be immediate and visible, or it could cause stress fractures that worsen over time.Improper Installation
If a skylight is not installed correctly, improper sealing or alignment can cause the glazing to crack. For example, an uneven frame may exert pressure on the glazing, eventually leading to damage.Aging and Wear
As skylights age, their materials naturally weaken. UV exposure can make acrylic and polycarbonate glazing more brittle, leading to cracks and chips. Glass, though more durable, can still be vulnerable to stress over time.Poor Maintenance
Lack of maintenance can also contribute to glazing damage. For instance, debris accumulating on the skylight can create pressure points, or mold and algae buildup can weaken the glazing.
Repairing Cracked or Broken Skylight Glazing
If you notice a crack or break in your skylight glazing, it’s important to address the issue promptly to prevent further damage. While minor cracks may be repaired temporarily, more significant damage usually requires replacement. Here are the steps involved in repairing or replacing cracked or broken skylight glazing:
Assess the Damage
Carefully inspect the skylight to determine the extent of the damage. A small crack or chip can often be repaired with a sealant or patch, but larger breaks or fractures in the glazing typically require full replacement.Clean the Area
Before repairing the damage, clean the skylight and surrounding area. Remove any dirt, debris, or moisture that could interfere with the repair process. If the skylight is still intact but cracked, be cautious while cleaning to avoid further stress on the glazing.Temporary Sealing
If the crack is small and the weather is not conducive to immediate repair (for example, if it’s rainy or windy), you can use a temporary sealant to prevent water from entering. A clear silicone or acrylic sealant can be applied to the crack or break to prevent moisture infiltration.Replace the Glazing
If the glazing is significantly cracked or shattered, you will likely need to replace it. Skylight glazing replacement is a specialized task that often requires professional help. Depending on the type of skylight, the glazing can either be a simple insert or a more integrated part of the skylight structure. A professional roofer or skylight technician can remove the damaged glazing and install a new one, ensuring proper sealing and weatherproofing.Upgrade to Impact-Resistant Materials
If you're replacing the glazing, consider upgrading to a more durable, impact-resistant material like laminated glass or polycarbonate. These materials are less likely to crack or break due to physical impacts or extreme weather conditions.Recheck the Frame and Seals
Once the glazing is replaced or patched, it’s important to inspect the frame and seals of the skylight. If the frame is misaligned or the seals are degraded, water can seep in, causing leaks. Ensure the entire skylight unit is secure and well-sealed.
When to Replace Your Skylight
While minor cracks or chips can sometimes be repaired, significant damage to the glazing usually indicates that the skylight should be replaced entirely. Here are some signs that it’s time for a full replacement:
Extensive Cracks or Breakage: If the damage is widespread or the glazing is shattered, a repair may not be sufficient, and replacement is necessary.
Frequent Leaks: If your skylight leaks regularly despite patching, it may be a sign that the glazing is no longer effective at keeping out water.
Energy Inefficiency: Damaged glazing can reduce your skylight’s energy efficiency. If you notice drafts or a significant increase in your energy bills, it might be time for a new skylight.
Aging Skylight: Older skylights, especially those made from acrylic or polycarbonate, may be more prone to damage. If your skylight is more than 15 years old and showing signs of wear, it could be more cost-effective to replace it rather than repair it.
Conclusion
Cracked or broken glazing in roof skylights can lead to a range of problems, from leaks to decreased energy efficiency. Whether the damage is minor or severe, addressing it quickly is important to prevent further issues. While small cracks can often be patched temporarily, large or widespread damage usually calls for full replacement. If you're unsure whether to repair or replace your skylight, consulting a professional roofer or skylight specialist can help ensure your home stays well-lit, safe, and protected.