Curling asphalt roofing shingles are unattractive, but they can also indicate major issues with the roof. This problem affects large sections of the surface and usually indicates it’s time for a replacement. Here are a few common reasons your shingles may be curling.

Why Roof Shingles Curl

1. Improperly Ventilated Attic

During the winter, the heater's hot air rises to the attic. Without proper ventilation, moisture from the air gets trapped under the roof, creating the perfect conditions for mold growth.

The mold reduces the shingles' contact with the decking, causing the pieces to curl and wave. To prevent this issue, install vents at the roof's ridge to direct warm, moist air out of the attic.

2. Extreme Weather

Freezing conditions can cause asphalt shingles to shrink and curl, then expand when the weather warms. Frequent freeze-and-thaw cycles will warp the roofing material and cause the shingles to work themselves loose.

3. Old Age

Asphalt roofing shingles can last 25 years or more. As they age, the tiny granules that protect the surface from the elements will fall off. This leaves the material exposed to UV light, which dries the top surface and causes the shingle to shrink. As the top layer tightens, the edges will curl upward. If the shingles are near the end of their life span, you may also find granules deposits in the gutters and downspouts.

If you’ve noticed curling shingles on your house, turn to the skilled team at American Roofing in Anchorage, AK. These licensed professionals will assess the roof to determine the cause of the damage, then perform the necessary repairs to restore the surface's look and quality. Visit the website to get more information about their residential services, or call (907) 345-8700 to request a free estimate.