Valley
Definition and meaning of Valley in real estate.
A valley is the V-shaped internal angle formed by the intersection of two sloping roof planes.
In more detail
Because roof valleys channel the runoff water from both adjacent roof slopes, they are subjected to a high volume of water flow and are prone to leaks if not properly constructed. To prevent water intrusion, builders install metal flashing or protective underlayment along the valley before laying shingles.
Home inspectors pay close attention to valleys, as debris like leaves can accumulate there and cause water to back up under the roofing material.
Key facts
| Category | Property Types & Construction |
|---|---|
| Vulnerable to | Leaks and debris accumulation |
| Common materials | Metal flashing, roll roofing, or self-adhering membranes |
| Required maintenance | Regular cleaning of leaves and debris |
A roofing contractor replaces the rusted metal flashing in a roof valley to ensure that rainwater flows smoothly into the gutters without seeping into the attic.
Frequently asked questions
What is the difference between an open valley and a closed valley?
An open valley leaves the metal flashing exposed to view, while a closed valley covers the flashing with shingles that are woven or cut across the intersection.
Why do roof valleys leak more than other areas?
Valleys concentrate water runoff from two different roof sections, creating a high-velocity stream that can easily exploit any gaps, punctures, or deteriorated flashing.