A chimney sits higher and more exposed than almost anything else on your house, and in the wet Puget Sound climate it takes a beating from rain, wind and freeze-thaw cycles most of the year. This category covers everything that keeps water out: the cap and chase cover on top, the crown that sheds rain off the masonry, the flashing where the chimney meets the roof, sealing the brick itself, and repairing damage once water has already gotten in. If you see ceiling stains near the chimney, a musty firebox, white crusty deposits on the brick, or flaking mortar, you are dealing with a water problem. The pages below help you figure out where yours is coming from and what to do about it.
What's Happening at Your Chimney?
- Water stains on the ceiling or wall near the chimney after it rains → Chimney Leak Repair — A diagnostic visit to trace the entry point and stop the leak at its source.
- No cap on top, or animals, birds and rain getting into the flue → Chimney Cap Installation — A cap keeps rain, debris and critters out of the open flue.
- The cap is bent, rusted or missing its screen → Chimney Cap Repair — Restore the cap so it sheds water and blocks intrusion again.
- Cracks in the concrete slab on top of the chimney → Chimney Crown Repair — Sealing crown cracks keeps rain from soaking straight into the masonry.
- The metal strip where the chimney meets the roof is lifting or rusted → Chimney Flashing Repair — Flashing is the most common leak point where the chimney meets the roofline.
- Bricks feel soft, are flaking, or mortar is crumbling → Chimney Water Damage Repair — Address absorbed-water damage before it spreads through the structure.
- Chimney looks fine but I want to stop water soaking into the brick → Chimney Waterproofing — A breathable sealant blocks rain while letting trapped moisture escape.
- A large chimney with no diverter behind it collects roof runoff → Chimney Cricket Installation — A cricket steers water around the chimney instead of into the flashing.
How to Tell Which Repair You Actually Need
Almost every chimney leak traces back to one of a handful of failure points. Working from the top down makes it easier to narrow yours before anyone climbs on the roof.
Start at the top
- The cap and chase cover. The cap covers the flue opening and the chase cover is the lid on a factory-built (metal) chimney enclosed in siding. A missing cap lets rain fall straight down the flue; a rusted chase cover puddles water and drips it inside. If you are not sure which you have, our guide on the difference between a cap and a chase cover sorts it out.
- The crown. This is the sloped concrete or mortar slab on top of a masonry chimney. Hairline cracks are common and often sealable; wide cracks and missing chunks usually mean it needs rebuilding. See repair versus replacement if yours is cracked.
Then check where the chimney meets the roof
- Flashing is the layered metal that seals the joint between the chimney and the roof. It is the single most common source of leaks, and because it lives at the roofline it often gets blamed on the roof instead of the chimney. Our article on whether a roofer or chimney company should fix it explains why.
- On wider chimneys, a cricket (a small peaked diverter behind the chimney) keeps roof runoff from pooling against the masonry in the first place.
Finally, the masonry itself
- Brick and mortar are porous. Over years of Northwest rain they soak up water, which then freezes, expands and breaks the surface apart. That is what causes flaking, spalling brick and the chalky white staining you may see. A breathable waterproofing treatment stops new water from getting in without trapping what is already there.
What to Expect From a Leak Visit
There is no reliable way to diagnose a chimney leak from a photo or over the phone. A proper visit means getting on the roof, inspecting the cap, crown, flashing and masonry, and often running water to reproduce the leak. From there you get a clear picture of the entry point and the specific fix, rather than a guess. If you want a sense of the numbers first, what leak repair typically costs walks through the variables. For an estimate on your chimney, request a quote.
Why Timing Matters in the Northwest
Water damage compounds. A small crack in a crown or a lifted piece of flashing lets in a little water at first, but each rain and each freeze widens the gap and pushes moisture deeper into the structure. Left alone, a top-of-chimney problem that could have been sealed turns into a rebuild, and the water can reach framing, insulation and drywall inside the home. Because our region stays wet for much of the year, catching intrusion early is the cheapest and safest path. The standard recommendation is an annual chimney inspection, which is also the natural time to catch water problems before the next burning season.
Water Protection Services We Provide
Helpful Guides on Chimney Leaks
- Why Does My Chimney Leak When It Rains?
- How Can I Tell Whether a Chimney Leak Comes From the Cap, Crown or Flashing?
- Does Chimney Waterproofing Really Work?
- Can a Leaking Chimney Damage My Ceiling, Attic or Walls?
- How Much Does Chimney Leak Repair Cost?
- Should a Roofer or Chimney Company Repair a Chimney Leak?
Frequently Asked Questions
How do I know if my chimney is actually leaking versus something else?
Telltale signs include water stains on the ceiling or wall around the chimney, a damp or musty smell in the firebox, white crusty deposits on the brick, rusted metal components, and flaking mortar. Because water often travels before it shows, the stain inside is not always directly below the entry point, which is why an on-roof inspection is the reliable way to confirm the source.
Where do most chimney leaks come from?
The most common culprits, in rough order, are failed or missing flashing where the chimney meets the roof, a cracked crown, a missing or damaged cap or chase cover, and porous masonry that has been absorbing rain for years. Many chimneys have more than one of these at once, so a full look from the top down matters.
Should I call a roofer or a chimney company for a leak near the chimney?
Leaks at the chimney-to-roof joint are frequently blamed on the roof but originate at the flashing, crown or cap, which are chimney components. A chimney specialist can inspect all of those points together rather than only the surrounding shingles. If the issue turns out to be the roof itself, that becomes clear during the inspection.
Is chimney waterproofing worth it, or is it just paint?
A proper masonry sealant is not paint. It is a breathable, vapor-permeable treatment that blocks liquid rain from being absorbed while still letting trapped moisture escape. That distinction matters: a non-breathable coating can trap water and make spalling worse. Applied to sound masonry, waterproofing is a genuine preventive step in a wet climate.
Can a chimney leak really damage the inside of my house?
Yes. Once water gets past the exterior it can reach ceilings, attic framing, insulation and interior walls, leading to stains, rot and mold over time. It also rusts dampers and can degrade the flue liner, which is a safety concern. That is why a persistent leak is worth addressing promptly rather than waiting.