Valley metal is installed where two roof slopes meet and form a valley. This area channels water down the roof, especially during heavy rain. Some valley metal is formed as a W-valley, which has a raised center rib to help manage water flow in an open valley.
Why It Matters
Because valleys carry concentrated water, poor installation can lead to leaks, shingle wear, debris buildup, and water traveling beneath the roof covering. The metal profile and material matter because the valley is one of the hardest-working drainage areas on the roof.
Common Problems
Problems include rust, punctures, improper overlaps, narrow valley openings, debris accumulation, exposed fasteners, and poor integration with ice and water shield. Valley metal may be made from galvanized steel, painted aluminum, or copper depending on the roof system, appearance goals, budget, and project requirements.
Exterior Echelon Notes
Exterior Echelon treats valleys as high-priority inspection areas and checks both the visible metal and the surrounding shingle and underlayment details. When W-valley metal is used, the raised rib, shingle cuts, underlayment, and drainage path all need to work together.
