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MINNEAPOLIS · CHIMNEY LINER INSTALLATION

Chimney Liner Installation in Minneapolis — First-Time Liner for an Unlined Flue

Sizing calculation documented — flue cross-section, appliance BTU output, and vent category all recorded. Every install ends with a city permit on file and a job record in your hands.
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FIRST-TIME INSTALL, NOT A RELINE

What a First-Time Chimney Liner Installation Covers

A chimney liner installation puts a code-compliant flue inside a chimney that has never had one — new installs in previously unlined flues only.
ChimTech installs stainless steel liners in Minneapolis homes where no liner currently exists. The liner creates a continuous, contained pathway for combustion gases from the appliance to the top of the stack — what current building code requires when a heating appliance connects to a chimney. Every installation begins with a flue measurement and ends with a city permit on file. If the chimney already has a liner that has cracked, deteriorated, or become incompatible with a new appliance, that’s a relining scenario — different in scope, sizing basis, and code triggers — covered on the chimney relining page.

First-Time Liner Installation

A flue that's never been lined.

Stainless liner into raw, unlined masonry

Sized to a new appliance's BTU and vent category

Establishes the first vapor barrier in the flue

Relining

An existing liner that failed.

Replaces a cracked or incompatible liner

Different sizing basis and code triggers

Covered on the relining page

Sized, Not Estimated
BTU · Vent Category · Diameter
City Permit Filed
Direct to Building Services
Two Documents
Sizing Calc + Inspection Record
One Crew
Measure → Install → Permit
WHEN A NEW APPLIANCE MAKES A LINER REQUIRED

Unlined Flues in Minneapolis Homes

Connecting a modern heating appliance to an unlined masonry flue creates a code compliance issue that must be resolved before the appliance goes into use.
An unlined flue — where flue gases travel directly through the brick-and-mortar structure — was standard construction in Minneapolis homes built before the 1940s, and acceptable at the time because the original appliances were matched to the chimney dimensions in use.
Today, when a homeowner installs a new wood stove, gas insert, or high-efficiency heating appliance, that unlined flue becomes a compliance problem. The chimney may look completely sound from the outside — the issue is entirely interior, and it doesn’t show up until the appliance installer or permit inspector flags it.
It’s a common trigger in older housing stock: homes in Longfellow and Lynnhurst frequently have flues that have never been lined, a condition distinct from homes where a liner existed and later failed. For historical context on original construction methods and materials, see the older home chimney resource.
THREE NUMBERS PRODUCE THE DIAMETER

What Brian Levi Assesses Before Sizing a First-Time Liner

Before ordering any material I measure the flue opening, confirm the appliance BTU output, and identify the vent category. Those three numbers produce the liner diameter. — Brian Levi, Founder, ChimTech
Portrait of Brian Levi, founder of ChimTech
Brian Levi
Founder, ChimTech
The sizing calculation isn’t something I estimate. An undersized liner restricts draft and creates pressure problems; an oversized one runs too cool, produces condensation inside the flue, and deteriorates the joints faster than a correctly sized liner would. The diameter follows from the appliance’s BTU output, vent connector size, and flue height — not a number carried over from a previous job.
On Minneapolis homes with exterior chimneys — more common in pre-1950 construction along corridors like 46th Street in Nokomis and the older blocks of North Loop near Washington Avenue — I also specify insulation for the liner run. Exterior chimneys lose heat faster than interior ones during a Minnesota winter, and that temperature drop reduces draft in an uninsulated liner, so insulation is part of sizing the system to perform in this climate. The job record includes the flue cross-sectional area, the appliance BTU output, the vent category, and the liner diameter selected — delivered in writing.
FILED DIRECTLY, NOT HANDED OFF

A Written Sizing Calculation and a Permit Record on Every Job

ChimTech files the Minneapolis mechanical permit directly — no permit expediter, no third-party hand-off.
The Minneapolis mechanical permit is the City of Minneapolis permit required for new chimney liner installations connected to heating appliances. It confirms that the liner type and size meet the appliance manufacturer’s specifications and local code. ChimTech files it directly with Minneapolis Building Services and schedules the city inspection as part of project close-out.
The homeowner receives two documents at the end: the passed inspection record and the liner sizing calculation. Together they confirm the liner was sized to the appliance — not estimated — and that the city verified the installation before the appliance went into use. Those records travel with the home, so a future buyer’s inspector or attorney gets a direct answer backed by a permit record and a sizing calculation on file.
OUR STANDARD

First-Time Installation Standards — What ChimTech Documents on Every Job

Documented to the same standard regardless of job complexity.

Flue measurement confirmed before material is ordered — internal dimensions recorded at the liner entry and exit points.

Liner diameter calculated against appliance BTU and vent category — not carried from a prior job or estimated by eye.

Material selected for appliance type — stainless steel rigid liner for straight flue paths, flexible liner where the flue has offsets.

Exterior liner runs insulated — thermal wrap applied where the chimney is on an exterior wall to hold flue temperature and draft in Minneapolis winter.

Top-plate fitted and sealed — the crown opening closed around the liner to prevent water infiltration after installation.

Minneapolis mechanical permit filed — ChimTech submits directly; inspection scheduled before project close-out.

Sizing calculation and inspection record delivered — the homeowner receives both documents before the crew leaves.

THE SEQUENCE

From Flue Measurement to City Inspection

A fixed sequence — measurement, materials, install, permit, inspection.
01

Flue & Appliance Assessment

Because there's no existing liner to remove, the focus is the masonry condition of the raw flue walls, the internal dimensions at multiple heights, and any offsets that affect routing. The crown opening is measured and the appliance connection confirmed at the base. The vent category — which classifies the appliance by flue-gas temperature and pressure and determines liner material and wall thickness — is identified from the appliance documentation. All findings are recorded before a diameter is specified or material ordered.

02

Liner Installation

The liner is dropped or threaded through the unlined flue from the crown to the appliance connection — a stainless steel rigid liner on straight flues for a smooth interior and optimal draft, flexible stainless where the flue has offsets. Exterior runs receive insulation wrap before seating; the top-plate is fitted and sealed at the crown, and the appliance connection is secured at the base. On a raw masonry flue, this also establishes the first complete vapor barrier between combustion gases and the surrounding brick.

03

Permit Filing & Inspection Close-Out

ChimTech confirms the liner seats flush at both the crown and the appliance connector and checks the flue path for gaps or movement. The Minneapolis mechanical permit is filed with Building Services, the city inspection scheduled, and the homeowner notified of the date. The job record — liner diameter, sizing calculation, appliance type, vent category, permit number, and inspection outcome — is delivered at close-out.

WHERE WE INSTALL

Where ChimTech Installs First-Time Chimney Liners

ChimTech installs first-time chimney liners across Minneapolis — scheduled and performed directly, without subcontracting or routing to outside crews.
We serve homeowners throughout the city, including Longfellow, Lynnhurst, Linden Hills, Nokomis, Powderhorn, Seward, Northeast, North Loop, and surrounding neighborhoods. Unlined flues are particularly prevalent in the pre-1940 corridors along East 38th Street, the Kingfield blocks south of Lake Street, and the older residential streets in Northeast near Central Avenue.
If your property is within Minneapolis and your flue needs a first-time liner, ChimTech handles the measurement, installation, permit filing, and city inspection — the crew that measures your flue is the same crew that installs the liner and files the permit.
LongfellowLynnhurstLinden HillsNokomisPowderhornSewardNortheastNorth Loop
Call (763) 402-9301 to schedule your liner assessment.

Book Your Minneapolis Chimney Liner Installation Assessment

Have your appliance type and property address ready. ChimTech confirms the liner sizing requirements and schedules a measurement visit; the permit is filed as part of the project — no separate step for you — and the job record and inspection confirmation are delivered before the crew wraps up. Prefer email? Reach us at office@chimtech.org.
Call (763) 402-9301
FAQ

Chimney Liner Installation — Frequently Asked Questions

A first-time installation puts a liner into a flue that has never had one — typically an older Minneapolis masonry chimney where flue gases traveled directly through brick and mortar. Relining replaces a liner that already exists but has cracked, deteriorated, or become incompatible with a new appliance. The two differ in scope, sizing basis, and the code triggers that prompt the work, which is why ChimTech treats them as separate services.

Unlined flues were standard before the 1940s and acceptable for the original appliances they were matched to. When you install a modern wood stove, gas insert, or high-efficiency heating appliance, current code requires a contained flue pathway sized to that appliance — so the unlined flue becomes a compliance issue. It’s usually flagged by the appliance installer or the permit inspector, even when the chimney looks sound from the outside.

The diameter follows from three documented numbers: the flue cross-sectional area, the appliance’s BTU output, and the vent category (plus vent connector size and flue height). It isn’t estimated. An undersized liner restricts draft and creates pressure problems; an oversized one runs too cool, condenses moisture inside the flue, and deteriorates the joints faster. ChimTech records the calculation and delivers it to you in writing.

Yes — a Minneapolis mechanical permit is required for a new liner connected to a heating appliance. ChimTech files it directly with Minneapolis Building Services and schedules the city inspection as part of project close-out, so there’s no separate step for you. You receive the passed inspection record and the sizing calculation at the end of the job.

An exterior chimney sits on an outside wall and loses heat faster than an interior one during a Minnesota winter. That temperature drop reduces draft in an uninsulated liner, so ChimTech specifies thermal wrap on exterior runs as part of sizing the system to perform reliably in this climate — not as an upsell, but as a draft requirement.

Two records that travel with the home: the passed city inspection record and the written sizing calculation, which lists the flue cross-section, appliance BTU output, vent category, selected liner diameter, and the permit number. At a future sale, a buyer’s inspector or attorney asking about the liner gets a direct answer backed by a city permit and a sizing calculation on file.