Open Valley Flashing Rebuild with W-Valley Metal
Project Overview
Leak traced to a woven shingle valley on a two-story home after heavy rain. Shingles in the valley showed wear consistent with concentrated runoff and the original closed valley had never been lined with metal.
Analysis
Closed woven valleys rely entirely on shingle overlap, which wears at the choke point of the run-off path. No metal liner was present, and water had traveled past the overlap during a severe rain event.
Process
Shingle removal along valley; full-length ice-and-water shield; W-valley metal install; parallel shingle cut; edge-sealing; controlled water test.
Outcome
Leak stopped on the water test. Valley now has a durable metal liner that will outlast the surrounding shingles and handle concentrated runoff cleanly.
Project Details
Materials Used
Pre-painted W-profile aluminum valley metal, ice-and-water shield, matching architectural shingles, roofing sealant, ring-shank nails.
Methods & Techniques
Converted the closed valley to an open W-metal valley with ice-and-water shield running the full length of the valley before the metal was set. Shingles cut parallel to the valley line and bonded at the cut edge.
Key Highlights
Converted closed woven valley to open W-metal; full ice-and-water shield; parallel cut line; water-tested before closeout.