Chimney Flashing Leak Repair Seattle, WA

Chimney flashing leak repair starts with a question most homeowners cannot answer from the living room: is the water actually coming in at the flashing? A brown ring on the ceiling next to the chimney can be caused by failed flashing, but it can also be a cracked crown, a missing cap, saturated brick, a leaking roof valley or even condensation inside the flue. James Chimney Sweep has spent 25+ years in Seattle and the Puget Sound tracing these leaks to their true source before anyone picks up a tube of sealant.

This page is for homeowners who have a leak and want it diagnosed correctly. If you already know your flashing is damaged and simply need it fixed, our Chimney Flashing Repair page covers that component-level work; if the metal is past saving, Chimney Flashing Replacement and Chimney Flashing Installation cover full tear-out and new systems. Here, the job is to prove where the water enters, stop it, and confirm it stays stopped through the next Puget Sound storm.

We are CSIA certified and licensed, bonded and insured in Washington, serving King, Pierce and Snohomish counties Sunday through Friday, 7am to 8pm.

Timing & Safety

When Flashing Leak Repair Is Urgent and When It Can Wait

Treat it as necessary now when:

• You can see active dripping or a stain that grows after each storm
• Attic sheathing or framing next to the chimney is soft, dark or growing mold
• Drywall near the chimney is bubbling, sagging or has started to crumble
• Flashing is visibly lifted or missing and the rainy season is starting

It can usually be scheduled, but should not be ignored, when:

• There is an old, faint stain that has not changed in a year
• Caulk or tar around the base is cracked but the attic is dry
• You are planning a roof replacement and want the flashing addressed at the same time

A small flashing leak rarely stays small in our climate. Water that enters at the roofline saturates brick and mortar, feeds freeze-thaw spalling in a cold snap, and rots the wood that holds the roof up. Fixing the leak early is almost always the cheaper path.

Safety considerations

Please do not go onto the roof to look for the leak yourself. Wet Puget Sound roofs, moss and steep pitches make falls the most common way a chimney problem turns into an emergency room visit. What you can safely do is note when the leak appears, which direction the wind was blowing, and photograph stains from inside the house or from the ground; that information genuinely helps our diagnosis.

• Never smear roofing tar or hardware-store caulk over flashing as a stopgap; it traps water behind the metal and makes the real repair harder
• If ceiling drywall is sagging or holding water, keep people and pets out of that room until it is addressed
• If the leak is inside the flue rather than outside it, stop using the fireplace until it is inspected; wet creosote and damaged liners are a different kind of problem
• We cannot confirm the source of a leak from photos alone; an on-site inspection is required

Seattle & Puget Sound conditions

Seattle, Tacoma and the rest of the Puget Sound hand chimney flashing a uniquely hard job. We get months of continuous light rain rather than short, hard storms, which means sealant never fully dries and any open lap sees water for weeks at a time. Wind-driven rain off the Sound pushes water sideways under laps that would be fine in calmer climates, which is why so many flashing leaks here show up only in a southwest gale. Moss grows on the uphill side of chimneys and in the cricket, holding water against the metal and mortar and slowly lifting the flashing. Near the water, salt air accelerates rust on galvanized flashing. And while our winters are mild, the few hard freezes we do get find every saturated mortar joint and crack it open. All of this is why a flashing leak in King, Pierce or Snohomish county is worth diagnosing properly rather than re-caulking every autumn.