How far should sheet metal roof valley flashing extend from the center line of the valley for wood shake roof systems?

In a wood shake roof system, the valley is a critical area where two slopes meet, and it is essential to ensure that water is effectively diverted away to prevent leaks. The sheet metal valley flashing should extend sufficiently from the center line of the valley to accommodate proper drainage and provide adequate coverage.

The correct distance for the valley flashing is 11 inches from the center line of the valley for wood shake roof systems. This measurement ensures that the flashing effectively captures and directs water runoff, thus minimizing the potential for moisture infiltration beneath the roofing materials.

This specific extension allows for proper overlap of the shakes and the flashing, ensuring a watertight seal and enhancing the overall durability and performance of the roofing system. Adequate flashing coverage is crucial, especially in valleys where water tends to accumulate, emphasizing the importance of adhering to these specifications during installation.