The answer to 'underlayment curling shingles' is that underlayment curling is a common issue that can cause shingles to become uneven or lift up. This is typically caused by poor installation, moisture, or exposure to heat and UV radiation over time.
Symptoms include visible curling or wrinkling of the underlayment, which can lead to shingles becoming loose, cracked, or falling off entirely. Solutions may involve re-installing the underlayment properly or replacing damaged areas, but in some cases, the entire roof may need to be re-done by a professional roofer.