Chimney Leak Repair in Seattle
Chimney leak repair in Seattle starts with finding the true source — flashing, crown, mortar joints, cap, or waterproofing failure. Water in your fireplace, ceiling stains near the chimney, or wet masonry after a Seattle rain? We diagnose the underlying cause, not just the symptom — and when the source is failed masonry, our Seattle chimney repair team handles the fix. Free inspection and written diagnosis before any repair work begins.
NCSG Member
National Chimney Sweep Guild
What We Diagnose
- Failed flashing & roofline joints
- Cracked or deteriorating crown
- Mortar joints & spalling brick
- Missing or damaged cap
- Failed waterproofing membrane
- Liner condition & smoke chamber
Some words from our happy customers
325+ five-star reviews across Google, Thumbtack, Yelp & Angi
“Genesis Home Services came out for a brief inspection before providing thorough advice and instructions. Professional, honest, and helpful — I wouldn't think twice about using this company again.”
Jake Hamilton
Google review
“Our built-in wood-burning stove with a 2-story Class A chimney was thoroughly cleaned by Genesis Home Services. He outlined his methodology, findings, and suggestions in detail. Outstanding service.”
Theo Mitchell
Google review
“David did an excellent job doing a clean up and tune up of our very old gas fireplace. He spent time explaining how to best operate and maintain the fireplace. Very knowledgeable and professional.”
Reza B.
Thumbtack review
Signs Your Chimney May Be Leaking
What homeowners notice before calling — and what we find when we arrive
Water in the fireplace or hearth
It came in above and ran down. The leak isn't where you're seeing it.
Ceiling stains near the chimney chase
Brown or yellow rings mean water is tracking down through the wall.
Musty odors when the fireplace isn't in use
Damp masonry and old creosote. Worst in summer.
Wet masonry on exterior brick
Dark patches that linger after rain — the brick is soaking faster than it dries.
Dripping sounds during or after rain
Water is already inside the wall.
Damaged drywall around the chimney
Bubbling paint or soft drywall. Fix the source before you patch it.
Leak Diagnosis & Repair
We Find the Source, Not Just the Symptom
Most chimney leaks have more than one cause. We trace water entry from the cap down to the flashing and fix what's actually failing — not just what's visible.
Get a Free Estimate →Common Causes of Chimney Leaks
A chimney leak repair starts with identifying which of these is the real source
Failed flashing
The metal seal at the roofline. It's our number one find.
Cracked chimney crown
Hairline cracks in the concrete cap let water into the brick below.
Deteriorated mortar joints
Worn joints give water a path in.
Porous brick
Old brick drinks. Once it's saturated the water moves inward.
Missing or damaged cap
An open flue is a funnel for rain.
Failed waterproofing
Sealant gives out around 5-10 years.
Roofline penetration issues
Vent boots and step flashing nearby. Looks like a chimney leak, isn't one.
Step 1 — Roofline
Chimney Flashing Repair
Flashing is the metal seal where your chimney passes through the roof — and the single most common source of chimney leaks. Sun exposure, freeze-thaw cycles, and routine roof movement break the sealant bond over time. Step flashing pulls away from the masonry. Counter-flashing develops gaps. Even small failures allow water into the attic and ceiling below.
We inspect, reseal, or replace flashing for a watertight fit — using grade-appropriate materials and proper masonry reglet cuts when needed.
Learn more about chimney flashing repair
Step 2 — Top of Chimney
Chimney Crown Repair
The crown is the concrete cap at the very top of your chimney. It sheds water away from the flue and the brick below. Hairline cracks from freeze-thaw cycles let water seep into the masonry, accelerating brick spalling, mortar deterioration, and eventually liner damage. Most chimney leaks that start "from above" trace back to crown failure.
We seal cracks with waterproof crown membrane or rebuild the crown entirely when deterioration is too far gone for sealing.
Learn more about chimney crown repair
Step 3 — Masonry Body
Chimney Masonry Leak Repair
Mortar joints absorb moisture and break down over decades — especially in Seattle's freeze-thaw climate. Once water enters the masonry, it migrates through the wall to interior surfaces. We restore deteriorated mortar through tuckpointing, repair spalling brick, and address localized water-damaged areas before they propagate.
Masonry leak repair is often paired with crown sealing and waterproofing to fully arrest the moisture cycle.
Learn more about chimney masonry repair
Prevention
Chimney Waterproofing
After repairing the source of the leak, waterproofing the chimney exterior protects against future moisture damage. We apply a vapor-permeable waterproof sealant that prevents water absorption while allowing the masonry to release any trapped moisture — extending the life of every repair we just completed. Waterproofing typically lasts 5–10 years before reapplication is recommended.
Important: Waterproofing is a prevention layer, not a repair. If you have an active chimney leak, the underlying cause — flashing, crown, mortar, or cap — must be fixed first. We diagnose and repair the source before waterproofing.
Top Protection
Chimney Cap Protection
An uncapped or damaged chimney cap lets rain pour directly into the flue. A properly fitted cap blocks rain, debris, and animal nesting — and includes a spark arrestor that meets fire safety code. Cap installation is one of the most cost-effective parts of a complete leak repair.
Most cap installations are completed in the same visit as the rest of the leak repair work.
Learn more about chimney cap installation
Local Expertise
Why Seattle Chimneys Leak More Often
Seattle's climate is uniquely hard on chimneys — and we see the patterns across every neighborhood we service.
Heavy annual rainfall
Masonry never fully dries between storms.
Freeze-thaw cycle damage
Water gets in, freezes, pushes the mortar out. Every winter.
Older brick chimneys
Pre-1960 homes in Ballard, Queen Anne and Beacon Hill still have original brick and clay liners.
Marine air corrosion
Salt off the Sound eats caps, flashing and dampers.
Roof flashing wear
More weather stress here, so seals fail sooner.
Moss and biological growth
Moss holds water against the brick and works into the joints.
Chimney Leak Repair FAQ
Questions Seattle homeowners ask before scheduling a leak inspection
Related Chimney Repair Services
Chimney Flashing Repair
Seal the chimney-roof joint
Chimney Crown Repair
Restore the concrete top cap
Chimney Cap Installation
Block rain, debris, and animals
Chimney Masonry Repair
Tuckpointing and brick restoration
Chimney Inspection
Level 1 & Level 2 — camera scan
Chimney Repair Hub
All chimney repair services
Stop the Leak — Schedule a Free Inspection
We diagnose the true source of the leak before recommending any repair work. Written inspection report. Free estimate. Serving Seattle and the broader Puget Sound region.
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Last reviewed: May 2026