"Why the Spot Below a Roof Valley Is Where New Gutters Overflow First" – Gutter Installation by Gutter Masters Cleaning & Installation in Concord, CA
Gutter installation plans usually treat a roofline as one even surface, but the valleys, the V-shaped creases where two roof planes meet, behave very differently. A valley collects the runoff from both planes and sends it down in one fast, narrow stream, so the stretch of gutter directly below it takes far more water than the rest of the run. On a Concord home with several roof planes, that stream can shoot across the trough and over the far edge in a heavy storm, even though the gutter is the right size and perfectly clean. The overflow shows up in one spot, again and again, and the cause is above it, not in the gutter. Gutter Masters Cleaning & Installation maps every valley on the roof before a run is laid out, then places a downspout outlet close to where each stream lands and adds a splash guard to slow the water down at that corner. The crew reinforces the hangers in those stretches, since the extra flow adds real weight and force, and tests the finished run with water...