Valley detailing on wood shake roofs is key to keeping water flowing smoothly off your home without leaks. There are three common valley types: woven, closed-cut, and open metal. Woven valleys weaves shakes from both sides of the roof into the valley itself, offering a natural look but requiring expert installation to avoid open gaps where water can sneak through. Closed-cut valleys have one side of the valley cut short, then a metal flashing installed beneath the opposing side's shakes to ensure water runs clear. Open metal valleys, most secure against leaks, use a visible metal valley flashing with shakes trimmed sharply along the edges for water to flow freely down the metal channel. These methods depend on correct installation—issues often come from poor nailing, uneven shakes, or flashing not extended properly. You can inspect valleys yourself by looking for loose or cracked shakes, any exposed or damaged flashing, or signs of moisture exposure beneath the roof decking, visible in attic spaces.
If you are comfortable on a roof, safely examine the valley for any displaced shakes or rusted flashing, especially after storms. Tap each shake gently to check for loose nails—any movement should be addressed promptly. However, valleys are critical points that can quickly lead to leaks and wood rot, so it’s smart to call a pro if you notice uneven edges, damaged or missing flashing, or signs of water stains inside your home. When discussing valley repairs with a roofer, ask what type of valley system they recommend for your specific climate and shake condition, and whether they factor in proper flashing underlayments compatible with wood shakes. Also, confirm if their work won’t void your wood shake warranty, as improper metal types or installation might. This ensures your investment lasts longer without costly leaks or early replacement.