Chimney Liner Installation in Warwick, NY

The liner is the interior surface of the flue — the part that contains combustion gases, protects the surrounding masonry and framing from heat, and gives the exhaust a smooth path out. When a liner fails, the chimney stops being a safe container. Relining restores that containment.

Three liner types

Clay tile

The standard in masonry chimneys for most of the last century. Durable and inexpensive, but it handles rapid temperature change poorly and its mortar joints degrade. A chimney fire, or decades of moisture, will crack tiles and open joints. Individual tiles can sometimes be replaced from the top; more often the practical fix is a stainless liner inside the existing flue.

Stainless steel

The common relining solution: a flexible or rigid stainless liner sized to the appliance, insulated, and connected top and bottom. Different alloys suit different fuels — 316 for wood, 304 where appropriate, and AL29-4C for high-efficiency gas condensing appliances. Using the wrong alloy for the fuel is a corrosion problem that shows up years later.

Cast-in-place

A pumped masonry mix that forms a new liner around an inflated form, bonding to the old flue. It reinforces the structure as well as relining it, which makes it an option on older chimneys with weak masonry. It's more involved and more expensive than stainless.

When a chimney needs relining

• Camera inspection shows cracked, shifted or missing tiles, or open joints
• The chimney is unlined — common in homes built before liners were standard
• You're adding a wood stove or insert to a flue sized for an open fireplace
• You're switching fuels, such as converting from oil to gas
• Tile is spalling and pieces are collecting on the smoke shelf
• There's been a chimney fire

Sizing matters more than people expect

A liner that's too large is as much a problem as one that's too small. Oversized flues let exhaust cool before it exits, which kills draft and accelerates creosote. This is the single most common defect we find after someone installs a wood stove insert into an existing fireplace flue: the appliance needs a six-inch liner and it's venting into an eight-by-twelve clay flue. The result is a stove that drafts poorly, smokes on startup, and loads the chimney with creosote in one season.

How a stainless reline goes

1. Inspect and measure — flue dimensions, offsets, total length, appliance requirements
2. Sweep the existing flue so the liner can pass cleanly
3. Insulate the liner with wrap or pour-in insulation, which both protects the masonry and keeps flue gases hot enough to draft properly
4. Lower the liner from the top and connect it at the appliance with the correct connector and tee
5. Terminate at the crown with a top plate and a cap
6. Verify draft and document the installation

Most single-flue residential relines are a one-day job. Chimneys with severe offsets, or flues too tight for the required diameter, take longer — occasionally requiring tile removal to make room.

Lifespan and warranty

A properly sized, properly installed stainless liner in a wood-burning application has a long service life, and quality liners carry manufacturer warranties, often tied to annual sweeping and correct fuel use. Burning wet wood or skipping maintenance is the fastest way to void that coverage. We install HomeSaver and DuraVent stainless liners — the two most widely used product lines in residential relining — and their warranties are typically lifetime limited when the liner is sized correctly, swept annually and used with the fuel it's rated for. You get the manufacturer's paperwork for your specific liner at handover, and our installation work carries its own 90-day warranty.

Repair or replace?

Isolated damage near the top of a flue can occasionally be addressed by replacing a tile or two. Damage spread through the length of the flue, or any damage in an unlined chimney, means relining. We'll show you the camera footage and explain which situation you're in rather than asking you to take it on faith. The tradeoffs are covered in more depth in our article on cracked chimney liners.