Valley Flashing Repair

What This Service Involves

A roof valley carries more water than any other part of the roof, and in our climate that concentrated flow makes valley flashing failure a frequent source of interior leaks. Debris from surrounding conifers, moss buildup, and corroded or undersized metal all conspire to back water up under the shingles. We clear the valley, evaluate whether the existing flashing is corroded, too narrow, or simply clogged, and rebuild it so the channel sheds cleanly again. Open metal valleys are often the most reliable choice here because they handle high volume and shed the needle debris that plagues Puget Sound roofs. We also check the shingle terminations along the valley, since improper cuts let water creep sideways.

Benefits

Restores full drainage capacity in the highest-volume part of the roof; Clears the conifer needles and moss that back water under shingles; Replaces corroded or undersized metal with properly sized flashing; Corrects shingle cuts that let water track sideways into the deck; Protects against the concentrated flow of heavy Northwest storms

Our Process

1) Clear the valley of moss, needles, and debris to expose the flashing; 2) Assess the metal for corrosion, width, and proper water-shedding profile; 3) Replace or rebuild the valley flashing and correct shingle terminations; 4) Seal the edges and flush-test the channel for clean drainage

What Affects the Cost

Length and pitch of the valley being repaired; Whether the metal can be salvaged or must be fully replaced; Amount of moss and organic debris removal required; Extent of any deck rot found beneath the valley; Shingle rework needed to correct terminations along the channel

Best Time of Year

Valley repairs are best scheduled in the drier months, though we prioritize them quickly whenever an active leak threatens the interior.