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

Moment #21: Gutter overflow streaks on siding

Overflowing gutters can push water under shingles and behind fascia boards. Streaks and staining below the gutter line may appear before any interior damage is obvious. During heavy rain, clogged gutters can cause water to back up onto the roof edge and soak the decking. Cleaning and checking downspouts is an easy first step, but persistent overflow can also indicate slope or capacity issues that need repair.