What is the minimum valley lining width required for open valleys with metal?

The minimum valley lining width required for open valleys with metal is 24 inches. This measurement is important because the valley is a critical area of the roof that directs water away from the structure. A wider valley lining helps to ensure that water flows effectively and does not lead to potential leaks or water intrusion into the building. Choosing 24 inches as the minimum width provides ample space for proper drainage and reduces the risk of damage from water pooling or overflow. Metal valleys are particularly effective due to their durability and resistance to the elements, making the specified width necessary to maintain optimal functionality and longevity of the roofing system.