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

Moment #14: Sagging roof line

A sagging roof line can indicate long-term moisture damage, rot, or weakened decking. This is more than cosmetic—structural strength may be reduced, especially after repeated wetting cycles. If the sag looks new or has increased over time, it deserves professional evaluation. Combine this with attic checks for darkened wood or damp insulation. Addressing structural issues early can prevent much larger repair work later.