How Long Do Skylight Domes Last?

The lifespan of a skylight dome can vary depending on the material, climate, installation quality, and maintenance, but generally, skylight domes last 15 to 30 years. Here’s a more detailed look at how long skylight domes last based on the material and factors that influence their longevity:

1. Material-Specific Lifespan

Acrylic Skylight Domes:
- Lifespan: Typically 15 to 20 years.
- Characteristics: Acrylic is a popular material for skylight domes due to its clarity and light transmission. However, it is more prone to yellowing and becoming cloudy over time, especially if exposed to UV rays. Acrylic is also more likely to become brittle after many years of exposure to weather elements.
Polycarbonate Skylight Domes:
- Lifespan: Typically 20 to 30 years.
- Characteristics: Polycarbonate is more durable than acrylic and less prone to yellowing. It is also much stronger and can withstand more extreme weather conditions, making it a popular choice for areas with harsh climates. Polycarbonate skylights often come with UV-resistant coatings to prevent damage from the sun’s rays.
Glass Skylight Domes:
- Lifespan: Typically 20 to 30 years or longer.
- Characteristics: Glass skylights tend to last longer than acrylic and polycarbonate because they are more resistant to UV damage, scratching, and yellowing. High-quality tempered or laminated glass can offer excellent durability. However, glass skylights are heavier and more prone to breakage if exposed to impact (e.g., hailstorms or falling debris).

2. Factors That Influence the Lifespan of Skylight Domes

UV Exposure: Skylight domes, especially those made of acrylic or polycarbonate, are exposed to direct sunlight, which can degrade the materials over time. UV protection coatings can help extend the life of the dome by preventing yellowing and cracking.
Climate: Harsh weather conditions (e.g., high winds, hail, heavy snow, or extreme heat) can wear down the dome faster. In areas with intense sun, UV degradation is more likely to occur, while coastal areas with saltwater exposure can cause damage to the seals or frame.
Maintenance: Proper care and maintenance, such as cleaning the dome and inspecting the seals regularly, can help extend its lifespan. Seals that break down over time can cause leaks, which may lead to further damage to the dome or surrounding areas.
Installation: A properly installed skylight dome with adequate flashing and sealant will last longer. Poor installation or improper sealing can lead to leaks and water damage, which can shorten the life of the skylight.

3. Signs It’s Time to Replace Your Skylight Dome

If you notice any of the following signs, it may be time to replace your skylight dome:

Cracking or Leaking: If the dome has developed cracks or leaks, it may no longer be providing adequate protection or insulation.
Yellowing or Cloudiness: If the acrylic or polycarbonate dome has yellowed or become cloudy, it may be reducing the amount of light coming into your home. This can also be a sign of UV damage.
Water Damage: Signs of water stains around the skylight or on the ceiling below it indicate that the seals or dome may be damaged and need replacement.
Decreased Light Transmission: If the amount of natural light entering through the skylight has noticeably decreased, the dome might be too weathered or dirty, or the reflective coating inside may have worn out.

4. How to Extend the Life of Your Skylight Dome

Regular Cleaning: Keeping the dome clean from debris, dust, and dirt will help maintain its clarity and prevent issues like moss or algae growth that can cause damage.
UV Protection: Ensure that your skylight dome has a UV-resistant coating, especially if it’s made from acrylic or polycarbonate. This will reduce the effects of sun exposure and prevent yellowing and brittleness.
Seal Maintenance: Inspect the seals around the dome regularly. Replacing worn-out seals can prevent water leaks and help preserve the integrity of the dome.
Professional Inspections: Consider having a professional inspect your skylight every few years to ensure the dome, seals, and flashing are in good condition.

Conclusion

The lifespan of a skylight dome typically ranges from 15 to 30 years, depending on the material and environmental factors. Polycarbonate and glass domes generally last longer than acrylic, but all skylight domes benefit from regular maintenance and care. With proper attention, your skylight dome can continue to provide natural light for many years.