Chimney Relining & Flue Liner Replacement in Seattle, WA

are the most popular option and our top recommendation for most Seattle homes. A continuous, flexible stainless steel tube is inserted down the full length of the flue, connected to the appliance at the bottom and capped at the top. Stainless steel liners are durable, corrosion-resistant, fast to install (usually 1 day), and carry a lifetime manufacturer warranty. They work with wood-burning fireplaces, gas appliances, and oil furnaces. For wood-burning applications, we wrap the liner with an insulation blanket to improve draft and reduce creosote formation.

are a cement-like material pumped into the chimney around an inflatable form. Once cured, the form is removed, leaving a smooth, seamless, insulated liner bonded directly to the existing masonry. This method is ideal for chimneys with structural concerns — the cast-in-place material actually strengthens the chimney from the inside. It is the best option for historic Seattle homes where preserving the exterior appearance is important.

are the traditional lining method. Individual clay tiles are stacked inside the flue. While durable and heat-resistant, clay tile replacement is labor-intensive and more expensive than stainless steel. We primarily recommend clay tile when matching existing construction in historic preservation projects.

Choosing the right flue liner type depends on your chimney's condition, your fuel source, your budget, and whether you plan to change appliances in the future. Here's a detailed comparison based on thousands of relining projects in the Seattle metro area. Stainless steel liners offer the best balance of performance, durability, and cost. Installation takes 4-8 hours for most chimneys. The liner is a continuous, corrugated tube that flexes through offsets and bends without breaking — critical for older Seattle chimneys that may not be perfectly straight. Grade 316Ti stainless handles all fuel types (wood, gas, oil) and resists the acidic condensation from gas appliances. With insulation wrap, they improve draft by 15-25% and reduce creosote accumulation. Lifetime warranty standard. Cost: $1,500-$4,500 installed. Cast-in-place liners are the best choice when the chimney itself needs structural reinforcement. The cement-like material bonds directly to the interior masonry walls, adding compressive strength to chimneys that are cracked, settling, or have been weakened by decades of moisture damage. This is the preferred method for many Capitol Hill and Queen Anne historic homes where the chimney exterior must remain unchanged. The smooth interior surface improves draft and reduces creosote buildup. Downside: installation takes 2-3 days and costs 20-40% more than stainless steel. If you ever need to change the flue size (e.g., converting to a different appliance), the cast-in-place liner must be drilled out — a costly procedure. Cost: $2,000-$6,000 installed. Clay tile liners are rarely the best choice for relining existing chimneys. While clay is excellent as an original construction material, replacing damaged tiles inside an existing chimney requires breaking out the old tiles and inserting new ones — a labor-intensive process that often costs more than stainless steel with inferior flexibility. We recommend clay tile only for historic preservation projects where matching original construction is a requirement. Cost: $3,000-$7,000 installed.

Seattle sits in one of the most seismically active regions in the continental United States. The Cascadia Subduction Zone, capable of producing magnitude 9.0+ earthquakes, runs just 100 miles offshore. The 2001 Nisqually earthquake (magnitude 6.8) damaged an estimated 15,000-30,000 chimneys across the Puget Sound region — many of which looked fine from the outside but had cracked flue liners invisible without a camera inspection. Clay tile liners are the most vulnerable to seismic damage. The rigid tiles crack at mortar joints when the chimney flexes during an earthquake, creating gaps that allow heat and combustion gases to reach the surrounding house structure. These cracks are often hairline-thin and impossible to detect without a video scope — which is why we recommend a Level II video inspection for any Seattle home built before 2000 that hasn't been inspected since the Nisqually event. Stainless steel flex liners are the most seismically resilient option available. The corrugated, flexible construction absorbs lateral movement without cracking. If your home experienced the Nisqually earthquake, or any of the smaller tremors that regularly occur in the Puget Sound area (there are 1,000+ per year), a stainless steel liner provides both immediate safety improvement and long-term seismic resilience. Cast-in-place liners, while strong in compression, can crack under lateral shear forces — though they perform better than clay tiles. For homes in Seattle's liquefaction zones (parts of SoDo, Georgetown, and the Duwamish Valley), stainless steel is the clear recommendation. We assess seismic risk as part of every relining consultation. If you're not sure whether your chimney was affected by past earthquakes, the video inspection will tell us definitively.

Wood-to-gas fireplace conversions have become one of the most popular home improvement projects in Seattle, driven by air quality regulations, convenience, and the efficiency of modern gas inserts. But most homeowners don't realize that converting to gas almost always requires relining the chimney — and skipping this step creates serious safety hazards. Why relining is necessary for gas conversion: Wood-burning fireplaces use large flues (typically 8x12 or 12x12 inches) to handle the high volume of hot combustion gases from a wood fire. Gas appliances produce far less volume but at lower temperatures. When hot gas appliance exhaust enters an oversized flue, it cools rapidly, causing water vapor in the exhaust to condense on the cold flue walls. This condensation is acidic (pH 2-3) and corrodes clay tile liners, mortar joints, and metal components from the inside out. Within 2-5 years, an unlined or improperly sized flue serving a gas appliance will show significant deterioration. Proper sizing matters: Gas inserts typically require a 4-6 inch round liner — much smaller than the original wood-burning flue. A flexible stainless steel liner is inserted down the existing chimney and connected directly to the gas appliance's exhaust collar. The insulation wrap is usually not required for gas-only applications (Type 304 stainless is sufficient), keeping costs on the lower end. Code requirements: Washington state code (WAC 51-51) and Seattle Municipal Code require that gas appliances be vented through an approved, properly sized flue liner. Using the original oversized clay tile flue for a gas insert is a code violation and a carbon monoxide risk. Our relining for gas conversion includes the liner, top termination cap, appliance connection, and permit coordination. Many of our Bellevue, Kirkland, and Mercer Island clients bundle the gas insert purchase with our relining service for a seamless, one-contractor conversion.