Flashing Failure: The #1 Cause of Roof Leaks
Roof leaks rarely start as emergencies — they start as small, fixable problems. In this guide, Roof Leak Repair Specialists, your local licensed expert in Burien, WA, explains what flashing failure: the #1 cause of roof leaks means for your home and when to call a certified expert.
What Flashing Does
Flashing is the metal (sometimes rubber or membrane) that seals the joints where the roof meets walls, chimneys, skylights, and vents. Shingles shed water; flashing directs it. When flashing corrodes, lifts, or was installed without proper overlaps, water pours into the joint with every rain.
How Flashing Fails
The usual failure modes: sealant drying and cracking with age, galvanized steel rusting through, step flashing installed without kick-out diverters, and chimney counter-flashing pulling out of the mortar joint. Thermal cycling — the daily expansion and contraction of metal — slowly works fasteners loose over the years.
Warning Signs Homeowners Can Spot
From the ground, look for rust streaks below chimneys and walls, visible gaps where flashing meets masonry, and caulk smeared thickly over old metal (a sign of repeat patching). Inside, stains that hug a chimney breast or an exterior wall almost always point to flashing, not shingles.
Proper Flashing Repair
A lasting flashing repair replaces the failed metal with new step or counter-flashing woven correctly into the shingles — not just a bead of caulk over the old piece. Chimney work should include re-cutting the mortar reglet and sealing it properly. Done right, new flashing outlasts the shingles around it.
A Local Note for Burien Homeowners
Burien gets roughly 37 inches of rain a year, most of it between October and April. Moss, saturated shingles, ice dams on cold snaps, and wind-driven rain off Puget Sound create the toughest leak conditions of any city we serve. Burien's housing ranges from 1950s ramblers near Boulevard Park to waterfront homes at Three Tree Point and new builds near Town Square. Older roofs with moss-damaged shingles and aging cedar are the most leak-prone. Burien's near-constant drizzle is a brutal leak detector — small flashing gaps that survive a California summer fail fast here. We build every repair for Puget Sound rain: positive drainage, sealed penetrations, verified with water tests.
Need Help With a Leak?
If you are seeing any of the warning signs above, do not wait for the next rain to make it worse. Roof Leak Repair Specialists offers free inspections with photos and upfront pricing — Built for Burien's Rain Our call representatives are available 24/7 for emergencies.