Some of the leading causes of damage to asphalt shingle roofs are hailstones, high winds, and heavy rainfall. UV damage is a lesser-known cause of damage, but it can affect the roof's performance and deteriorate the materials, paving the way for moisture infiltration. Therefore, if you have an older asphalt shingle roof, inspect it for solar damage to avoid costly repairs down the road. With this in mind, here are four top signs to look out for.

Curled or Warped Shingles

During the day, solar heat causes shingles to warm up and expand. When the temperatures drop at night, the shingles contract to their original size. This expansion and contraction cycle causes the shingles to become weak and brittle. Over time, they may curl up at the edges and warp. Curled shingles leave gaps for moisture to penetrate the roof. Once moisture infiltrates the structure, it damages more shingles and exposes the structure to further damage. Therefore, replace all curled or warped shingles to protect your roof deck from moisture.

Missing Shingle Granules

Modern asphalt roofs have reflective stone granules on the surface. These granules reflect UV rays and make the material more resistant to solar damage. However, the tiny granules can get washed away by the rain or dislodged by debris throughout the roof's lifespan. Granule loss allows UV rays to penetrate the shingles, causing thermal expansion. Severe granule loss can lower the roof's energy efficiency and increase annual cooling costs. You must replace the affected shingles to protect the structure from severe solar damage.

Discolored Shingles

The sun has a tendency to discolor materials, and your asphalt roof is no exception. Years of sun exposure will cause the roof to lose its original color. You may notice light patches in areas where the shingles are in constant contact with the sun. Roof discoloration is a cosmetic issue, but it can be a precursor to shingle damage. Therefore, inspect the shingles to determine the best course of action. If the roof is still in good condition, you can paint the discolored shingles to restore their appealing look.

Decayed Asphalt Shingles

Conventional roofing shingles are made of cellulose covered in a layer of asphalt. Cellulose is a plant-based material; therefore, it can decompose and rot when exposed to moisture. Shingle decay is a severe form of deterioration that begins with UV damage. When the sun heats the roof, it causes the shingles to curl up. Gaps occur between individual shingles, which allows moisture into the material, causing the cellulose to break down and rot. You must remove the affected shingles to protect your roof from structural damage.

Is your shingle roof exhibiting these signs of UV damage? Contact a company like Catawba Valley Roofing & Restoration LLC for more information.