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Figure 1 is a photo of a typical glass fiber substrate asphalt shingle, a common roofing shingle used throughout the United States. A fiberglass mat is impregnated with asphalt and then coated with a ceramic grit called granules. Claims of roof shingle wind damage often arise when discovering curling of the shingle tabs after a severe wind storm (Refer to Figures 2 and 3). Curling is typically a long-term-related deterioration of the shingle brought on by a variety of causes not related to wind damage. 

Four typical causes of shingle curling are outlined below:

The purpose of the sealing stripis to hold the neighboring shingle tabs down to prevent curling or lift during high winds. If the shingles are installed improperly where the sealing strip does not line up with the next shingle according to the manufacturer’s recommendation, then the shingle tabs will not be secure and will curl upward or inward over time.

Improper nailing is a common cause of shingle curl. In Figure 1, the nails are placed according to the shingle manufacturer’s recommendations. In Figure 4 below, a nail has been driven into the sealing strip, which limits the effectiveness of the seal on the sealing strip. Over time, as a result of thermal cycles–heating during the day and cooling at night–the nail can back out, causing the shingle tab to lift and part from the seal, leading to curling as shown in Figures 4 and 5. In addition, insufficient nailing can lead to curling.

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