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Chimney liners · Boise & the Treasure Valley

Chimney liner installation in Boise

The liner is the part of the chimney you can’t see and the part doing most of the work. If yours is cracked clay tile, missing, or wrong for the appliance, here’s what relining actually involves, and what it should cost.

Call (208) 555-0144 See cost ranges first

What a liner does

A chimney liner has two jobs: move smoke and flue gases out of the house without restriction, and keep heat away from the chimney’s structure while the fire runs. Chimneys.com puts it plainly: the liner exists "to allow for the smooth passage of smoke and toxic flue gasses to exit the home without restriction, and second, to reduce the exterior temperature of the chimney during use."

This isn’t optional equipment. The residential code adopted in Idaho (Boise enforces the 2018 International Residential Code) states it in four words: "Masonry chimneys shall be lined."

How Boise chimneys end up needing one

  • Cracked clay tiles. Most older masonry chimneys are lined with clay flue tile. Clay handles routine use, but it cracks under sudden temperature swings. Tile liners can fracture when there’s a 500°F differential, exactly what a chimney fire produces. Once tiles crack, patching them tile-by-tile is rarely practical; relining is the realistic fix.
  • No liner at all. Some early-1900s chimneys in Boise’s North End and East End may predate flue liners entirely and can turn up unlined. An unlined flue puts hot gases directly against old brick and mortar.
  • A new appliance on an old flue. Swapping a fireplace for a wood stove or insert changes the draft and temperature profile. The flue needs to match the appliance, which usually means a properly sized stainless liner run the full height of the chimney.
  • After a chimney fire. Chimney fires burn at around 2,000°F and can crack tiles and displace mortar even when the fire seems minor from inside the house. A Level 2 inspection with a camera is how you find out what the fire actually did.

Liner options, honestly compared

Stainless steel

The default answer for relining in this market. Stainless liners are listed or tested to the UL 1777 standard, the certification for field-installed liners in masonry chimneys, which includes repeated 2,100°F burn tests. For wood-burning appliances the liner should be insulated; the Chimney Safety Institute of America (CSIA) is direct about this: "Liners used with solid fuel-burning appliances, however, do need to be insulated." Insulation keeps flue temperatures up (better draft, less creosote) and allows tighter clearances to the old structure.

Clay tile

Fine in new masonry construction, but for an existing chimney, replacing tiles means opening the stack. As Chimneys.com notes, relining with tile is "difficult, if not impossible, to do except for very short sections."

Cast-in-place

A cement-based liner poured around an inflated form inside the flue, cured overnight. It can add structural value to a deteriorated stack, but fewer local crews offer it and it is the most involved of the three.

What it costs

National figures put relining between $1,200 and $4,600 (Fixr, 2025), with installed totals from $900 up to $7,000 depending on material and chimney height (HomeGuide). Material drives the spread: roughly $10 per square foot for clay against $65 for stainless, plus $400–$1,250 in labor (Angi, 2026). Taller chimneys, steep roofs, and offset flues push toward the high end. The full breakdown, with every source and date, is in our Boise chimney repair cost guide.

Permit note: the City of Boise’s homeowner guide lists "installation or alteration of ductwork, vent system or chimney" as work requiring a mechanical permit. A legitimate installer handles this as part of the job, and it’s a fair question to ask whoever quotes you.

What happens when you call

  1. Describe the chimney: age, appliance (open fireplace, stove, insert), and what prompted the call.
  2. The contractor scopes the flue; for relining decisions a camera inspection is the standard of care.
  3. You get a written quote with liner material, diameter, insulation, and permit handling spelled out.

One call connects you to an independent Boise-area chimney company. This site is a referral line, not the installer. How that works, including how to verify any contractor’s registration yourself, is on how this site works.

Sources

  1. Chimneys.com — "Chimney Liner Options Explained for the Homeowner" (liner purpose; clay tile cracking at 500°F differential; tile relining impractical; UL 1777 testing; cast-in-place process) · chimneys.com
  2. Idaho Residential Code (2018 IRC), R1003.11: "Masonry chimneys shall be lined." · up.codes
  3. City of Boise — current codes (2018 IRC adoption) · cityofboise.org
  4. City of Boise — Homeowner’s Guide (mechanical permit for vent system or chimney work) · cityofboise.org
  5. CSIA homeowner resources (insulating liners for solid-fuel appliances) · csia.org
  6. UL 1777 standard scope (field-installed chimney liners) · shopulstandards.com
  7. CSIA "The Facts About Chimney Fires" (≈2000°F chimney fires crack tiles, melt mortar) · miamivalleyfiredistrict.org
  8. Fixr chimney repair costs, updated Jan 2025 (reline $1,200–$4,600) · fixr.com
  9. Angi chimney liner cost guide, updated May 2026 (material per sq ft; labor range) · angi.com
  10. HomeGuide chimney repair costs (installed liner $900–$7,000) · homeguide.com
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