Roof valleys are one of the most common reasons gutters overflow. A valley concentrates water from multiple roof planes and sends it into one section of gutter at high speed.
Why valleys overwhelm gutters
During a heavy storm, water can rush down a valley faster than the gutter can accept it. If the gutter is undersized, poorly pitched, clogged, or missing the right downspout capacity, water spills over the edge.
Why bigger gutters help
Summerville Gutter installs new gutter systems starting at 6 inches and larger. Larger gutters give high-flow roof sections more capacity and can help reduce overflow when paired with the correct downspout layout.
Gutter guards and valleys
Gutter guards can help reduce debris buildup, but a valley still needs to be handled carefully. Water volume, roof pitch, and guard design all matter.
What we inspect
- Where valleys discharge
- How fast water hits the gutter
- Current gutter size and pitch
- Downspout placement below the valley
- Whether a drainage improvement is needed