The answer to 'underlayment curling' is that underlayment can curl for several common reasons, including exposure to moisture, improper installation, or poor quality materials. Curling underlayment can lead to leaks, damage to the roof, and other issues. To address underlayment curling, the first step is to identify the root cause. If the curling is due to moisture exposure, the underlayment may need to be replaced. Improper installation can often be corrected by a professional roofer. In some cases, replacing the underlayment with a higher-quality product may be necessary.
It's generally best to have a professional roofer inspect and address underlayment curling, as they have the expertise to properly diagnose and fix the problem. Attempting DIY roof repairs can be risky and lead to further damage if not done correctly.