Symptoms
- Shingle edges lifting or curling upward
- Cupped or bowl-shaped shingles
- Shingles look brittle or are losing granules nearby
Likely causes
- CommonNormal aging of the roofAsphalt shingles lose flexibility and curl as they approach 15–25 years old.
- CommonPoor attic ventilationTrapped heat and moisture under the roof deck bakes shingles from below.
- PossibleWrong or too few roofing nails, or improper installationShingles not fully sealed down can curl prematurely.
- Less commonManufacturing defectSome shingle batches curl early; a roofer can spot this pattern.
What to do
- Note whether curling is isolated to one area (suggests ventilation or a local issue) or spread across the whole roof (suggests age).
- Check the attic for adequate insulation and airflow through soffit and ridge vents.
- Look for granule buildup in gutters, another sign the shingles are wearing out.
- Check the roof's installation date or ask a previous owner or inspection report for its age.
- Get a roof inspection to check for soft spots or leaks starting under the curled shingles.
- Improve attic ventilation if that's a contributing factor, even before full replacement.
- Budget for roof replacement if curling is widespread, since patching an aging roof only buys limited time.
Tools and parts
- Ladder
- Flashlight for attic
When to call a pro
Have a roofer inspect and give you an honest read on remaining roof life versus replacement.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.