How UV Rays Impact Asphalt Shingles Over Time
Asphalt shingles are one of the most popular roofing materials across the United States—thanks to their affordability, durability, and variety of styles. But even the best shingles aren’t immune to the effects of time and nature. One of the most overlooked threats to your roof? Ultraviolet (UV) rays from the sun.
Over time, constant exposure to UV radiation can break down the components of asphalt shingles, reducing their lifespan and performance. Understanding how UV rays impact your roof can help you take preventative steps to preserve your investment. That’s where we come in.
Rescue My Roof has been a leading educator in the roofing industry for over a decade. We’ve helped thousands of Wisconsin homeowners protect their homes and families. Now, we’re here to help you, too.
In this article, we’ll cover how UV rays can damage your roof and what to do about it. Ultimately, you’ll know what to do to keep your home safe from the sun’s harsh rays.
The Science Behind UV Damage
UV rays are a form of electromagnetic radiation emitted by the sun. While they’re invisible to the naked eye, their effects on materials—especially those exposed to them for years—can be dramatic.
For asphalt shingles, UV rays initiate a slow but steady breakdown of their core materials: asphalt, fiberglass, and protective granules.
Common Effects of UV Exposure on Asphalt Shingles
Here’s what happens to asphalt shingles as UV rays take their toll over time:
1. Drying and Brittleness
The sun’s heat and UV rays dry out the oils in the asphalt, causing the shingles to become brittle. Brittle shingles are more prone to cracking, curling, or breaking off during strong winds or storms.
2. Granule Loss
Shingles are coated in protective granules that help deflect sunlight and protect the asphalt layer. UV exposure can loosen and wash away these granules over time, leaving the asphalt layer vulnerable to further damage.
3. Fading Color
Prolonged sun exposure can bleach the pigments in your shingles, leading to uneven fading and loss of curb appeal. While this may be mostly cosmetic, it can also indicate deeper damage.
4. Accelerated Aging
The combined effects of heat, UV, and moisture cause shingles to age prematurely. A roof that should last 20-25 years may show signs of wear much sooner in sun-heavy regions or on south-facing slopes.
Signs Your Roof Has UV Damage
Look out for the following signs that your asphalt shingles may be suffering from UV-related wear:
- Curled or cracked shingles
- Bald spots where granules are missing
- Discoloration or bleaching
- Shingle edges lifting or fraying
- Increased indoor heat due to reduced insulation
If you notice any of these signs, it might be time for an inspection.
How to Protect Your Roof from UV Damage
While you can’t eliminate sun exposure, there are steps you can take to minimize UV damage:
Choose UV-Resistant Shingles
Many modern asphalt shingles come with built-in UV protection. Look for high-quality, algae- and UV-resistant options from trusted manufacturers.
Install a Radiant Barrier
A radiant barrier installed in your attic can reflect heat and reduce the impact of UV on your roof from below.
Routine Inspections
Have your roof inspected annually—especially after summer—to catch signs of UV wear early.
Regular Maintenance
Cleaning your roof, clearing debris, and making small repairs can go a long way toward extending your roof’s lifespan.
Stay Ahead of UV Wear
UV rays may be invisible, but their impact on your roof is very real. Over time, they can weaken your asphalt shingles, leading to leaks, increased energy bills, and costly repairs. By choosing UV-resistant materials, scheduling routine inspections, and taking preventive measures, you can keep your roof strong and sun-safe for years to come.
Learn more with “What to Know About Cool Roof Technology in 2025” and “What are Atlas Pinnacle Sun Shingles?”
If you’re concerned about UV damage or want to explore more durable roofing options, Rescue My Roof can help. Contact us today to get a free estimate.
