Can my fireplace flue be angled?

Are you planning to install a new wood-burning fireplace or stove in your home?  If you’re doing much of the work yourself, there’s some basic information and some specific chimney requirements you will need to follow.  Let’s shed some light on this subject.

LET’S START WITH SOME DEFINITIONS.

A “flue” is the lining of a chimney.  It can be ceramic clay tile, a poured or pumped cast-in-place liner or a stainless steel conduit that’s installed inside a chimney.  Its purpose is to contain all the by-products from combustion, direct them to the outside atmosphere and protect the walls of the chimney from excessive heat and corrosion.

Chimney flues are normally associated with a masonry fireplace.

An “insulated” stainless steel or an “air cooled” stainless steel chimney is always used with zero clearance or factory built fireplace.

Although safety codes have required a flue liner in masonry chimneys for several dozen years, there are many masonry chimneys still being built improperly or without any type of flue liner at all.  Additionally, there are many flue liners in dire need of repair.

Clay and brick old chimney Can my flue be angled? Can my chimney be angled?

THREE TYPES OF MASONRY CHIMNEY LINERS:

The most common type of masonry chimney liner are ceramic clay tiles.  A clay tile is considered “bare minimum code” and is the least expensive type of chimney liner.  Clay tiles are readily available at brick yards, most lumber yards and DIY centers.  Clay tile chimneys are typically installed at the time the house was originally built.

Fireplaces that are properly operated and maintained perform quite well with a ceramic clay tile liner.  However, there are several disadvantages, including thermal shocking; that is, a fast, sudden rise of temperature.  Ceramic clay tiles cannot rapidly absorb and evenly distribute heat.  Temperature in this type of chimney need to be brought up slowly to prevent the tiles from cracking.  Ceramic tile also can have a difficult time containing the liquid by-products of combustion, especially from gas appliances.

A third problem that’s quite common with a clay tile liner is during its initial installation.  Often, tiles are simply stacked on top of one another or mortared into place with standard brick mortar.  This type of mortar will quickly deteriorate.  The bonding material that’s used to join tiles together needs to contain the flue gases, help minimize condensation and be able to withstand extremely high temperatures.

The second type of lining system is a stainless steel chimney liner.  These are frequently used to repair or upgrade an existing chimney.  They are also needed for wood burning inserts.  A stainless steel liner is very safe and is extremely durable.  Stainless steel can be used for wood, gas and fuel oil.  Don’t get a stainless steel liner confused with an aluminum liner.  Aluminum is only used for natural or LP gas.

The third type of liner, a cast-in-place chimney liner is either poured or pumped into place.  It’s a cement-like mixture that resembles mortar but has a very high insulative value.  It’s a smooth and seamless liner, suitable for wood, gas and fuel oil.  The main application for this type of liner is for improving the structural integrity of an older, aging chimney.

OFFSET OR NOT?

So back to the question at hand:  Can we install an angle, or offset, a chimney?  The answer is “yes”!  It’s done every day and is perfectly safe to do so, provided codes are followed and equipment is properly maintained.  NFPA 211 (US regulations) states that chimneys can be offset 15° or 30° while CSA B365 (Canadian regulations) states it can be offset at a 30° to 45° angle.  Proper clearances must be maintained and the correct materials must be used.

Chimneys with a too severe angle or offset can interfere with the flow of oxygen to the fire and the velocity of the outflow of the combustion by-products.

Another point worth mentioning; it’s always best to keep the chimney as straight as you can and inside the house for as long as you can.  Chimneys built on an outside wall, especially masonry chimneys, can cool off too quickly leading to creosote forming.

Note that if you’re using an insulated, stainless steel chimney pipe for a wood burning stove or EPA certified fireplace, all components must be from the same manufacturer.  A pipe length from Brand A cannot be used with an offset from Brand B.  A cap or roof flashing from Brand X cannot be used with a pipe from Brand Z.  All components of the chimney system must be from the same manufacturer.  This requirement has to do with the testing and listing procedures and how the components twist lock and fit together.

Yes you can angle your chimney flue, Fireplace icon, chimney flue icon and check mark, Can my flue be angled? Can my chimney be angled?

WOOD BURNINGS STOVES:

Many people get the term “connector pipe” and “chimney pipe” mixed up.  They are not synonymous terms.

A connector pipe on a free-standing wood burning stove is the black pipe that comes out the top (sometimes out the back) of the stove and “connects” the appliance to the chimney system.  This black pipe can be a single wall pipe or a double wall pipe, depending on the clearance requirements for the stove.   The primary function of the connector pipe is to connect the stove to the chimney.  That being said, a single wall connector pipe can be offset at any angle, up to and including 90°.  This is accomplished through adjustable elbows.  Double wall connector pipe can be offset at either 45° or 90°.

A single wall connector pipe is used when clearances are not particularly critical.  Double wall connector pipe has a stainless inner pipe with a black heat shield as the outer pipe.  The two-wall connector is used when reducing the stoves clearance requirements to a combustible wall.

People often refer to an insulated chimney pipe and a double wall connector pipe as the same: “double wall pipe”.  It’s true that both have two walls and the inner walls on both pipes are stainless steel.  However, their applications are different.  The easiest way to avoid any confusion:  the connector pipe is the black stove pipe that connects the stove to the chimney system.

Ambiance wood fireplace Elegance 36 with stone surround, nice new chimney, Can my flue be angled? Can my chimney be angled?

BUILDING PLANS?

If you are building an addition or a new home and need a chimney for your fireplace or stove, your WE LOVE FIRE expert would recommend an insulated stainless steel chimney system.  This type of chimney comes with all the components you might need: various pipe lengths, offsets, firestops, support brackets, anchor plates, roof flashings, storm collars and caps.  This type of chimney can normally be installed within a few inches of combustible framing components.  It can easily be offset, or angled, around rafters, trusses or other framing to maintain those clearance requirements.  It’s a tested and listed pipe that comes with a warranty from the manufacturer.

We highly recommend hiring an expert for your chimney installation.  However, if you decide to do it yourself, your insurance company might require your work to be inspected and approved by a certified professional.

Don’t even consider a masonry fireplace and chimney.  There’s no testing procedure and the warranty expires when the mason pulls out of your driveway!

Other articles you may find worthwhile reading include:

Below is a list of fireplace and grill stores that service ()

Auburn, AL

Top Hat Chimney Sweeps
1280 Financial Ct.
Auburn, AL 36830

Top Hat Chimney Sweeps LogoVisit Store Page

Elk Grove, CA

Custom Fireside Shops
9097 Elk Grove Blvd.
Elk Grove, CA 95624

Custom Fireside Shops LogoVisit Store Page

Sacramento, CA

Custom Fireside Shops
5455 Auburn Blvd.
Sacramento, CA 95841

Custom Fireside Shops LogoVisit Store Page

Durango, CO

Durango Outdoor Living
140 Rock Point Drive
Durango, CO 81301

Durango Outdoor Living LogoVisit Store Page

Durango, CO

Four Corner Stoves & Spas
3001 Main Avenue
Durango, CO 81301

Four Corner Stoves & Spas LogoVisit Store Page

Grand Junction, CO

Stove Depot and Chimney Works
330 North Ave.
Grand Junction, CO 81501

Stove Depot and Chimney Works LogoVisit Store Page

New London, CT

Family Hearth and Patio LLC
571 Broad Street
New London, CT 06320

Family Hearth and Patio LLC LogoVisit Store Page

Ridgefield, CT

Yankee Doodle, Inc.
71 Ethan Allen Highway
Ridgefield, CT 06877

Yankee Doodle, Inc. LogoVisit Store Page

Dover, DE

Byler's Stove Shoppe Inc.
1368b Rose Valley School Rd.
Dover, DE 19904

Byler's Stove Shoppe Inc. LogoVisit Store Page

Destin, FL

Doodlebuggers Service Network
36054 Emerald Coast Parkway
Destin, FL 32541

Bettendorf, IA

Fireplaces Plus, Inc.
1745 State Street
Bettendorf, IA 52722

Fireplaces Plus, Inc. LogoVisit Store Page

Post Falls, ID

Quality Stoves & Home Furnishings
569 N Syringa St
Post Falls, ID 83854

Rockford, IL

Advanced Chimney Systems, Inc.
3486 Lonergan Drive
Rockford, IL 61109

Advanced Chimney Systems, Inc. LogoVisit Store Page

Wauconda, IL

Grass Roots Energy, Inc.
28751 N Route 12
Wauconda, IL 60084

Grass Roots Energy, Inc. LogoVisit Store Page

Evansville, IN

Firemaster, Inc.
5300 E Morgan Avenue
Evansville, IN 47715

Jeffersonville, IN

Olde Towne Chimney & Fireplace Sales
915 Nachand Ln
Jeffersonville, IN 47130

Olde Towne Chimney & Fireplace Sales LogoVisit Store Page

Overland Park, KS

Kansas City Fireplace Center
10470 Metcalf Avenue
Overland Park, KS 66212

Kansas City Fireplace Center LogoVisit Store Page

Erlanger, KY

TateBuilder's Supply, LLC
3511 Dixie Highway
Erlanger, KY 41018

TateBuilder's Supply, LLC LogoVisit Store Page

Littleton, MA

Woodstove, Fireplace and Patio Shop, Inc.
60 White Street
Littleton, MA 01460

Woodstove, Fireplace and Patio Shop, Inc. LogoVisit Store Page

Seekonk, MA

The Fireplace Showcase
775 Fall River Ave
Seekonk, MA 02771

The Fireplace Showcase LogoVisit Store Page

Sudbury, MA

Woodstove, Fireplace and Patio Shop, Inc.
348 Boston Post Road
Sudbury, MA 01776

Woodstove, Fireplace and Patio Shop, Inc. LogoVisit Store Page

Duluth, MN

Duluth Stove & Fireplace
2431 W Superior Street
Duluth, MN 55806

Duluth Stove & Fireplace LogoVisit Store Page

Minneapolis, MN

Woodland Stoves & Fireplaces
2901 Franklin Ave. South
Minneapolis, MN 55406

Oakdale, MN

Energy Savers of Minnesota
6298 Highway 36 Blvd N
Oakdale, MN 55128

Energy Savers of Minnesota LogoVisit Store Page

Rochester, MN

Brekke Fireplace Shoppe
1904 S. Broadway
Rochester, MN 55904

Brekke Fireplace Shoppe LogoVisit Store Page

Walker, MN

Wilkening Fireplace Company
9608 State 371 NW
Walker, MN 56484

Wilkening Fireplace Company LogoVisit Store Page

Fargo, ND

Home Heating, Plumbing & A/C Inc.
701 28th Street South
Fargo, ND 58103

Omaha, NE

Fireplace By Design
13913 R Plaza
Omaha, NE 68137

Epping, NH

The Stove Shoppe
285, Calef Highway Rte. 125
Epping, NH 03042

Windham, NH

The Stove Shoppe
25 Indian Rock Road
Windham, NH 03087

Hamilton, NJ

Bowden's Fireside - Hearth & Home
1731 Nottingham Way
Hamilton, NJ 08619

Bowden's Fireside - Hearth & Home LogoVisit Store Page

Voorhees, NJ

Rettinger Fireplace Systems, Inc.
476 Centennial Blvd
Voorhees, NJ 08043

Rettinger Fireplace Systems, Inc. LogoVisit Store Page

St. Henry, OH

Buschur's Refrigeration, Inc.
541 N Eastern Avenue
St. Henry, OH 45883

Buschur's Refrigeration, Inc. LogoVisit Store Page

Media, PA

Chimney Cricket
101 State Road
Media, PA 19063

Chimney Cricket LogoVisit Store Page

Rapid City, SD

Hebron Brick Company
1543 Deadwood Ave
Rapid City, SD 57709

Hebron Brick Company LogoVisit Store Page

Sioux Falls, SD

Hebron Brick Company
2211 W. 50th Street
Sioux Falls, SD 57105-6525

Hebron Brick Company LogoVisit Store Page

Vermillion, SD

Kalin's Indoor Comfort Inc.
710 Cottage Avenue
Vermillion, SD 57069

Kalin's Indoor Comfort Inc. LogoVisit Store Page

Manassas, VA

Winston's Chimney Service
11301 Industrial Road
Manassas, VA 20109

Winston's Chimney Service LogoVisit Store Page

Barre, VT

Chimney Sweep Fireplace Shop
1284 US Rte, 302 Ste 10
Barre, VT 05641-2317

Chimney Sweep Fireplace Shop LogoVisit Store Page

Bennington, VT

Friends of The Sun
126 Hicks Avenue
Bennington, VT 05201

Friends of The Sun LogoVisit Store Page

Manchester, VT

Friends of The Sun
159 Depot Street
Manchester, VT 05255

Friends of The Sun LogoVisit Store Page

Shelburne, VT

Chimney Sweep Fireplace Shop
3113 Shelburne Road
Shelburne, VT 05482

Chimney Sweep Fireplace Shop LogoVisit Store Page

White River Jnct, VT

Home Comfort of New England
1255 VA Cut Off Road
White River Jnct, VT 05001

Home Comfort of New England LogoVisit Store Page

Burlington, WI

Burlington Fireplace & Heating LLC
857 Milwaukee Ave.
Burlington, WI 53105

Burlington Fireplace & Heating LLC LogoVisit Store Page

Madison, WI

Top Hat
5117 Verona Rd
Madison, WI 53711

Top Hat LogoVisit Store Page

Morgantown, WV

Rustic By Design
709 Beechurst Ave. Suite 15
Morgantown, WV 26505

Laramie, WY

High Country Stoves & Fireplaces
860 N. 3rd Street
Laramie, WY 82072


For more information, contact your local fireplace and grill store.

No Comments Yet.

Leave a comment