In roofing, what is a valley?

A valley in roofing is defined as the area where two sections of the roof meet and create a sloped drainage channel. This design is crucial for directing water runoff away from the roof and into the gutters. Valleys can be found where there is a change in the roof plane, typically at intersections of different roof slopes. Proper installation and maintenance of valleys are critical, as they can be points of weakness where leaks might occur if not adequately constructed or sealed. Understanding the role of valleys helps in ensuring effective water management and maintaining the overall integrity of the roofing system.