The liner is the chimney's most important and least visible part. It is the smooth interior channel that carries combustion gases safely up and out while protecting the surrounding brick and the framing from the heat. On Somerville's older homes the original liner is usually clay tile laid when the house was built, and decades of heat, settling, and freeze-thaw have left a lot of those tiles cracked or gapped. Somerville Chimney Sweep installs stainless and cast-in-place liners sized to the appliance they serve, fitted to code, insulated where the chimney calls for it, and draft-tested before we pack up, so the chimney is safe and drawing properly.
- Sized to the actual appliance and flue
- Stainless steel or cast-in-place systems
- Installed to code and to the standard
- Insulated and sealed for a steady draft
- Right-sized when an old flue is too large for a new furnace
- Draft verified before we leave the site
When an old Somerville flue needs a new liner
There are a few clear reasons a chimney needs relining, and on Somerville housing all of them turn up regularly. The most common is a cracked or deteriorated clay tile liner, which the camera inspection reveals and which is genuinely dangerous, because a breach in the liner lets heat and combustion gases reach the brick and the wood framing around the chimney. A chimney fire often cracks tile, the freeze-thaw cycle works the mortar joints between tiles loose, and simple age does the rest. Once the camera shows cracked or separated tile, relining is not an upsell, it is the fix that makes the chimney safe to use again.
The second common reason is a change of appliance, and this catches a lot of Somerville homeowners by surprise. When an old wood or coal flue is repurposed for a modern high-efficiency furnace or water heater, or when a homeowner installs a new gas or wood stove insert, the original masonry flue is frequently far too large for the new appliance. An oversized flue lets gases cool too quickly, which weakens the draft and lets moisture and acidic condensate attack the chimney. A correctly sized stainless liner solves that, matching the flue to the appliance so it vents the way it was designed to. We size the liner to the appliance you actually have, not a one-size guess.
How we line a chimney so it draws and lasts
Relining is precise work, and the difference between a liner that performs and one that disappoints is in the details. We start from the camera inspection that established why the liner is needed and what size the appliance calls for. For most jobs a stainless steel liner is the right system, durable, smooth-walled for a clean draft, and well suited to both wood and gas appliances. Where a chimney has more complex damage, a cast-in-place liner that rebuilds and reinforces the flue from the inside can be the better answer. We fit the liner top to bottom, insulate it where the chimney and the appliance call for it, and seal it at the cap and the connection so there are no gaps.
Insulation is the step budget installers skip, and it matters in this climate. An insulated liner keeps the flue gases warm on the way up a cold Somerville chimney, which strengthens the draft, reduces condensation, and slows the creosote buildup that a cold flue encourages. On the tall interior flues common in this city, where gases have a long, cold climb, that insulation is often the thing that turns a chimney that smoked and struggled into one that draws cleanly. Cutting that corner saves a little up front and costs you draft and durability for the life of the liner.
Proving the chimney draws before we leave
A reline is not finished when the liner is in place. It is finished when we have confirmed the chimney actually vents the way it should. Before we pack up, we verify the draft, check that the appliance is connected correctly to the new liner, and make sure the whole system is sealed and pulling properly, because a liner that is installed but not drawing right is a liner that has not done its job. You do not get a vague assurance that it should work now. You get a chimney we have confirmed is venting safely, with the work documented.
Relining is a larger job than a sweep or a cap, so we treat the honesty around it as seriously as the work. We line a chimney when the camera shows a genuine reason, and we show you that footage so you can see the cracked tile or understand the sizing mismatch yourself. We will not sell a reline to a chimney with a sound liner, and if a repair will do, we will quote the repair. When relining genuinely is the answer, you get a system sized correctly, installed to code, insulated where it matters, draft-tested, and backed in writing, so the most important part of your chimney is one you never have to think about again.
Where this work sits in the bigger picture
A chimney is a system, so chimney liner replacement rarely stands alone, it connects to fireplace sweep, pre-season chimney inspection, crown repair, a new chimney cap, chimney repointing, and our crew handles all of it under one roof. We bring the same service to Chimney Liner Replacement in Cambridge, Medford chimney liner replacement, Everett chimney liner replacement, Malden chimney liner replacement and everywhere else across the Somerville area.
If you searched for a local chimney crew near you, you have reached a local crew, call 617-203-6382 any time. For background, read Caring for the Chimney on a Somerville, MA Victorian on our blog, or head back to our Somerville home page to see everything we do.