Shingles lift for several reasons, most related to age, weather, installation, or ventilation issues. The most common reason is wind damage breaking the sealant bond. Asphalt shingles have a thermally activated adhesive strip that bonds shingles together. High winds, especially if shingles were installed in cold weather and never properly sealed, can break this bond and lift edges. As shingles age past 15 to 20 years, the adhesive loses strength and granule loss makes them lighter and more prone to lifting. Improper installation is another major cause, such as using too few nails, nails placed too high above the manufacturer's nailing line, or not enough pressure with a nail gun, allowing wind to get underneath. Poor attic ventilation causes heat buildup that can soften shingles and cause them to warp and lift. Moisture issues, such as ice dams in winter, can push up under shingles and lift them. Physical damage from walking on the roof, fallen branches, or animals can also lift shingles. If lifting is isolated to a few shingles, it may be wind-related and repairable with roofing cement. If lifting is widespread across the roof, it usually indicates the roof is nearing end of life, has ventilation problems, or was poorly installed, and you should have a professional inspection to determine if replacement is needed.
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