What key feature is characteristic of the metal flashing used in open valleys?

The characteristic feature of metal flashing used in open valleys that is crucial for its proper function is the minimum height of the center rib, which is typically designed to be at least 1 inch high. This center rib serves several important purposes in the roofing system.

First, the height helps to manage water flow effectively within the valley area. Water tends to accumulate in valleys, and the raised rib aids in directing this water towards the designated drainage points while reducing the likelihood of water pooling, which could lead to leaks or deterioration over time.

Additionally, the raised center rib helps to create a channel that minimizes the impact of debris such as leaves or twigs. By maintaining a defined space for water to flow, it prevents obstruction from debris that could obstruct drainage, thereby promoting proper water management and increasing the longevity of the roofing materials.

In summary, the design of open valley metal flashing with a minimum 1 inch high center rib is essential for effective water diversion, preventing leaks, and ensuring the roof’s durability against environmental elements.