Chimney safety
Your chimney is a fire-and-gas appliance that stands outside in salt air and eight months of rain — many here since the craftsman era. This is what actually keeps it safe, in plain English.
A fireplace feels simple — strike a match, enjoy the evening. But the chimney above it is a working safety system, charged with carrying flammable creosote and toxic combustion gases up and out of the house every time you burn. When any link in that chain gives way — a cracked liner, a choked flue, a missing cap — the two real dangers are a chimney fire and carbon monoxide drifting back inside.
The South Sound raises the stakes. Salt-tinged air off the water corrodes metal and gnaws at mortar; the long wet season soaks brick that then cracks in a freeze. And around Tacoma, a great many chimneys were laid between 1900 and 1930 — beautiful craftsman-era masonry, often still venting through its original flue. The good news is that nearly every chimney hazard is predictable and preventable with a yearly look and a few sound repairs. This guide covers what to watch for and when to call in a pro.
Start here
The national fire-safety standard, NFPA 211, calls for every chimney, fireplace and vent to be inspected at least once a year — and on a flue that may have been drawing smoke since the 1920s, that yearly look is not a formality. What fails is hidden: inside the flue, up on the crown, under the flashing. A proper chimney inspection runs a camera through the whole system and catches small trouble while it's still small.
It's also the cheapest peace of mind on the calendar: proof the flue is clear and the stack is sound before the season's first fire.
The #1 fire risk
Each time wood smoke cools on its way up the flue, it deposits creosote — a tar-like, highly flammable residue. It builds in three stages, hardening as it goes, and a glazed Stage 3 layer can ignite into a chimney fire fierce enough to crack a liner in minutes. In an older flue that has gathered decades of seasons, that risk compounds quietly.
Seasoned, dry wood slows the buildup; nothing stops it. Routine sweeping and, when the glaze has set, professional creosote removal strip out the one thing a chimney fire cannot burn without: its fuel.
The invisible risk
CO has no color and no smell. A blocked or cracked flue can turn it back into the house instead of letting it go — which is why a sound liner, a clear flue and working CO alarms on every floor are non-negotiable.
Carbon monoxide, in detail
Everything that burns in your house and vents through the chimney — wood stove, gas fireplace, furnace, water heater — gives off carbon monoxide. A healthy flue carries it up and away without your ever knowing. But a flue plugged by a bird's nest, choked with creosote, or cracked so gases seep into a wall cavity can send CO back into the rooms — a scenario worth taking seriously in older houses whose flues predate every modern venting code. Since the gas gives no warning of its own, the defenses stack: a clear, properly sized flue, an intact liner, and a working CO alarm on every floor and near the bedrooms. Test the alarms when the clocks change, and never run a fuel-burning appliance if you suspect the flue is blocked.
Salt air and rain
Brick and mortar are porous, and craftsman-era brick — much of it laid between 1900 and 1930 — has been drinking South Sound rain for a century. When that water freezes, it expands and breaks the masonry apart from the inside: the freeze-thaw cycle. Close to the water, salt-laden air works alongside it, softening mortar and corroding every piece of metal it touches.
Caught early, this is honest masonry restoration — repointing joints, recasting a crown. Ignored, the water keeps working until it reaches the flue. A breathable waterproofing seal is the most cost-effective way to buy old brick more time.
The flue's last defense
The liner is the sleeve inside the chimney that contains heat and gases. Here's the local catch: many craftsman-era chimneys still run on their original clay tile flue — or were never lined at all — and clay tiles crack with age, with settling, and after any chimney fire. An undersized or broken-down liner can push heat toward century-old framing or let combustion gases seep into the house.
That makes a failed liner a safety matter, not a cosmetic one. When an inspection turns up liner damage, chimney relining with a properly sized stainless liner restores both the barrier and the draft — and lets an old fireplace burn safely for decades more.
Keep the weather out
In a place that rains like the South Sound, water is a chimney's oldest enemy. An open or rusted-out flue funnels every storm straight down onto the liner and damper; failed flashing sends it into the ceilings and walls beside the stack instead. A stainless chimney cap earns its keep twice over — it doubles as a spark arrestor and keeps birds and squirrels from nesting in the flue, one of the most common and most dangerous blockages we find.
Know the line
A handful of habits keep the house safer between visits. The flue, the roof and anything carrying fuel belong to trained hands — doubly so on a chimney older than everyone in the house.
Before the first fire
Late summer or early fall, before the rush — so any restoration is finished before the first cold evening calls for a fire.
Send last season's buildup out with the summer, so the chimney starts the wet months clean and drawing strong.
An intact cap, an uncracked crown and sealed flashing are the three things standing between South Sound rain and your masonry.
Fresh batteries, then test the smoke and carbon-monoxide alarms on every level and outside the bedrooms.
Seasoned, dry hardwood only. Wet or green wood smolders, cools the flue and paints it with creosote fast.
Keep reading
Plain-spoken advice on keeping an old chimney safe, drawing well and watertight through the South Sound's long rainy stretch — no pressure, no scare tactics.
Common questions
Peace of mind starts here
Choose a real opening on the crew's calendar. Tacoma Chimney Pros photographs every visit — nothing to pay when you book, and you only ever pay for work you've approved.
