25 Roof Leak Warning Signs (With Photos) — When to Call a Roofer for Repair

Moment #23: Exposed nail heads / fasteners on shingles

Exposed nail heads can become direct entry points for water. Over time, temperature changes can loosen fasteners and crack sealant around them. Even a tiny opening can route water into underlayment and insulation. If you notice multiple exposed nails in one roof section, it’s a sign of aging installation or wind stress. Sealing and replacing fasteners is a common targeted repair that prevents larger moisture damage.