Do I need a chimney liner for a wood burning stove?

What a chimney liner actually does

A flexible stainless liner gives the stove a sealed, correctly sized route for the smoke from the appliance right up to the pot. That improves the draw so the fire lights easily and burns cleanly, reduces the build-up of soot and tar, protects the chimney structure from heat and acidic gases, and makes future sweeping much easier.

When you need one, and when you might not

Most older chimneys are far larger than a modern stove needs, which weakens the draw and lets gases cool and condense. Damage, old parging, or a chimney that has never taken a stove before all point to lining. A sound, correctly sized chimney in good condition can sometimes be used without a liner, but that is the exception rather than the rule.

We inspect the chimney on the home survey and tell you straight what it needs. We will never line a chimney that does not need it.

316 grade or 904 grade?

A 316 grade stainless liner is the common choice for mainly burning wood. It is durable, corrosion resistant and cost effective, and it suits most homes used under normal conditions.

A 904 grade liner is a higher specification steel with far greater resistance to the acidic condensates and higher temperatures you get from heavy use or a mix of wood and smokeless fuels. It costs more up front but lasts longer, so it is the better long-term choice if the stove is your main heat source.

How we actually check your chimney

The survey is not a glance up the flue with a torch. We check the chimney inside and out: the condition of the stack and pot, the size of the flue against the stove going into it, evidence of old tar or damp staining on chimney breasts upstairs, and a smoke test to see where the draw stands. Where something needs a closer look we camera-inspect the flue before quoting, so the price is built on what is actually up there.

That matters because the wrong assumption in either direction costs money: lining a chimney that did not need it wastes yours, and skipping a liner the chimney needed creates a poor fire at best and a dangerous one at worst.

What lining a chimney involves on the day

Most relines are a single day. The flexible liner goes down the chimney from the top, gets connected to the stove at the bottom and to the pot and cowl at the top, a register plate closes off the old flue space, and the system is smoke-tested before the stove is commissioned. Access is planned on the survey, so the method and any access costs are in the written quote, not added later.

The finished job is invisible: what you notice is the fire lighting easily, burning steadily and sweeping cleanly for years.

Signs an existing liner has reached the end

Liners do not last forever, especially older ones or those that have run wet wood or heavy smokeless use. The signs: a stove that has become steadily harder to light, tar smells on damp days, flakes of blackened metal appearing in the grate or on the register plate, and a sweep telling you the brush feels wrong. Any of those is worth a proper inspection.

If yours has failed, replacement is the same day-job as a first lining, and it is the moment to upgrade to the 904 grade if your stove works hard.

Common questions