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A valley in roofing refers to the intersection of two roof slopes, where water and debris can accumulate and potentially cause leaks or damage. An aluminium valley is a type of flashing that is commonly used to protect this vulnerable area. It’s typically made of aluminum due to its lightweight and corrosion-resistant properties.

Aluminum valley has a width of 18 inches (approximately 45.7 centimeters) and a length of 2.4 meters. The width is crucial to ensuring the valley covers the necessary area between the intersecting roof slopes, and the length determines how much coverage the valley provides along the roof.

Aluminum valleys are designed to channel water away from the intersection, preventing water infiltration and potential damage. They play a critical role in maintaining the integrity of the roof and preventing leaks in areas where water tends to accumulate.