Chimney Creosote Removal Seattle, WA

Creosote is the tar-like residue that condenses inside a chimney every time wood burns. It starts as loose soot, hardens into brittle flakes, and can finally bake into a shiny, glazed coating that no brush will touch. Chimney creosote removal is the work of figuring out which of those three stages you have and clearing it with the method that stage actually needs, so the flue is clean enough to burn safely again. Any household that burns wood in a fireplace, insert or stove needs this at some point; in the Puget Sound, where damp softwood and slow, smoldering fires are the norm, it tends to come sooner.

This page is the overview. It explains how creosote forms, why it builds so fast here, what each degree looks like, and what it takes to remove it. Our Chimney Sweep page covers the routine annual service that keeps light buildup from ever becoming a problem; this page is for the deposit itself, once it is already there. When the inspection tells us which stage you have, we match it to our Chimney Cleaning Stage 1, Stage 2 or Stage 3 service, each of which is described in more detail on its own page.

James Chimney Sweep has served Seattle-area homeowners for more than 25 years. We are CSIA certified, and licensed, bonded and insured in Washington.

Timing & Safety

When creosote removal is necessary and when it can wait

NFPA 211 recommends that chimneys be inspected annually and cleaned when deposits are present. In practice, the guideline most sweeps work to is that any accumulation of roughly an eighth of an inch or more should come out before the next fire, and glazed creosote should be removed at any thickness.

• Necessary now: visible flakes or glaze in the flue, a smoky smell in the room, smoke rolling back, any sign of a past chimney fire, or a fireplace in a home you just bought with no record of the last cleaning.
• Necessary this season: you burn most evenings through the winter, you burn wood that was not fully seasoned, or you run a stove or insert damped down overnight. These habits produce second-degree creosote quickly.
• Can usually wait for the routine sweep: a fireplace used a handful of times a year with dry hardwood and a light dusting of soot. That is ordinary maintenance, handled by our Chimney Sweep service.

If you are unsure which group you are in, an inspection settles it. We do not diagnose by phone or from photos.

Safety considerations

Creosote is concentrated, unburned fuel stuck to the inside of your chimney. When a flue reaches the right temperature it ignites, and a chimney fire can reach temperatures that crack clay tiles, warp metal liners and transfer heat to the wood framing around the chimney. Many chimney fires burn unnoticed and are only discovered at the next inspection.

• If you hear a roar, see flames or sparks from the top of the chimney, or smell intense burning, get everyone out and call 911. Do not try to put it out from inside the flue.
• Do not use creosote-removal logs or powders as a substitute for removal. They can loosen some deposits, but the loosened material still has to be physically taken out, and they do nothing against heavy glaze.
• Do not attempt to scrape or brush a glazed flue yourself. Dislodged chunks can block the flue, and the work needs the liner checked afterward.
• Removal is done from inside the home and from the roof by our technician with proper equipment; we never ask homeowners to go onto the roof.
• Burn dry, seasoned wood, keep fires hot and open the air supply rather than smoldering a load overnight. These are the three habits that slow creosote more than anything else.

Seattle & Puget Sound conditions

Creosote forms faster in the Puget Sound than in most of the country, and the reasons are local. Much of the firewood sold and cut here is fir, hemlock and other softwoods that carry a high resin content, and after a wet autumn it often goes into the fireplace well above the moisture level it should have. Wet wood burns cool; cool smoke condenses on the flue walls instead of leaving the chimney. Add the regional habit of damping a stove or insert down to smolder through a long, mild, damp evening, and you have the ideal recipe for second- and third-degree buildup. The marine air does its part too: a chimney that sits cold and damp between fires collects moisture in existing soot, and that moisture makes deposits heavier, more acidic and more likely to smell in the living room on muggy days. Homes in Seattle, Tacoma, Everett and the surrounding counties that burn through a full heating season should expect to be on the faster end of the creosote schedule.