A corner wood stove needs the clearances on its own listing label and in its manual, measured to both walls. Its connector pipe needs its own: 18 inches to combustibles for single wall stove pipe under Table M1803.3.4 of the IRC chapter on chimneys and vents, and less for listed double wall pipe.
No single wood stove corner clearance fits every stove. Two stoves of the same size can list very different corner clearances, so the manual of the stove you buy decides where it sits. The pipe, the hearth and the chimney route are then planned around it.
Can You Put a Wood-Burning Stove in a Corner?
Yes, when the stove's manual shows a corner installation and your room gives the clearances it lists. A corner diagram in the manual usually sets the stove at an angle across the corner, with its own figures for that position.
If the manual shows no corner installation, ask the stove maker which figures apply before you plan the corner. Then plan the three things a corner wood stove installation changes. They are the connector pipe, the floor under the stove and the way the chimney leaves the room.
Where Does Corner Wood Stove Clearance Come From?
It comes from the stove's listing label and its installation manual, never from a general rule or from another stove's figures. A corner installation is measured to both walls.
A corner diagram often measures from the stove's rear corners to each wall, sometimes along the diagonal. Measure exactly the points the diagram shows, to the nearest combustible surface on each side. This table shows what sets each distance in a corner.
| Distance | Measured from | Where the figure comes from |
|---|---|---|
| Stove to each of the two walls | The points the manual's corner diagram shows | The stove's listing label and manual |
| Connector pipe to each wall and the ceiling | The outside of the pipe, along the whole run | The pipe's listing; single wall stove pipe needs 18 inches under IRC Table M1803.3.4 |
| Floor protection | The stove's sides, rear and door opening | The stove's manual |
| Chimney through the ceiling or wall | The outside of the Class A pipe | The chimney's installation instructions |
| Permit and inspection | Before the first fire | Your local building department |
There is no single national building code in the US. Codes are adopted locally, so your building department decides which edition applies and what it inspects.
How Much Space Is Needed for a Corner Wood Stove?
The space is the stove's footprint, plus its two corner clearances behind it, plus the floor protection in front, all taken from the manual. Mark that outline on the floor with tape, at the stove's angle, before you buy anything.
Check the connector pipe as well. On a stove with a top outlet near the back, the pipe rises close to the corner. If the pipe needs more clearance than the stove does, the pipe decides how far out the stove sits.
Choose a Stove Whose Corner Clearances Fit the Room
Measure the corner first, then compare stoves by their manuals rather than by their size. Ask the dealer for the installation manual before you pay.
Get These Eight Answers in Writing Before You Buy
- Is the stove listed for a corner installation?
- What are its corner clearances to each wall?
- From which points on the stove are they measured?
- Which connector pipe does the manual allow: single wall, double wall or both?
- Does the manual list reduced clearances with a listed shield, and which shield?
- What floor protection does it need, and how far in front and to the sides?
- What is the flue collar diameter, and does it exit at the top or the rear?
- What does the manual say about combustion air?
Keep the manual and these answers together. Your building department may ask to see the manual at the inspection.
What Clearance Does the Connector Pipe Need in a Corner?
The connector pipe needs its own clearance to each wall and to the ceiling, along every section of the run. In a corner it has two walls close by, so measure to both.
Single Wall Stove Pipe Needs 18 Inches to Combustibles
Per NFPA 211, single-wall stove pipe (the connector pipe inside the room between the appliance and the Class A chimney) must maintain at least 18 inches of clearance from any combustible wall, ceiling, or framing.
Clearance is measured to combustible material, so a genuinely non-combustible wall, such as poured concrete, concrete block or solid masonry, needs no clearance, though direct metal-to-metal contact should still be avoided.
Brick or stone applied over a wood-framed wall does not count as non-combustible: it conducts heat through to the framing behind it, so the 18 inches is measured to that framing rather than to the face of the brick. Take the clearance for your own run from the listing and the installation instructions supplied with the pipe you install.
In a corner with brick or stone facing on both walls, that means measuring to the framing behind the facing on each side.
Our 6 inch single wall stove pipe comes in fixed lengths and telescoping sections. Rather than cutting a length, use a telescoping section to close the gap between the stove and the chimney. Single wall pipe is stocked in 8 inch as well.
Double Wall Connector Pipe Is Listed for Closer Clearances
Double wall connector pipe has an inner and an outer wall with an air gap between them. That gap is why its listing lets it sit closer to combustibles than single wall pipe. The figures come from the listing of the pipe you install, and our guide on how to install double wall stove pipe sets them out.
In a corner hearth or a tight alcove, that smaller clearance is usually why people choose double wall pipe. Our comparison of single wall vs double wall stove pipe shows when the difference decides the choice.
We stock 6 inch double wall stove pipe as one matched line, with fixed lengths, adjustable lengths and a telescoping section. If the stove's manual gives one set of clearances with single wall pipe and another with double wall, use the set for the pipe you buy.
Can You Reduce Corner Clearances?
Only in the ways the stove's manual and listing allow. Some manuals list reduced corner clearances when a listed shield is fitted to the stove or the wall. Those figures hold only for that shield, fitted exactly as the manual shows.
The same holds for single wall stove pipe. The installation instructions for our Class A system keep it 18 inches from combustibles unless a clearance reduction system your building department accepts is used, or the stove is listed with a different clearance in its instructions.
Brick or stone facing gives no clearance reduction on its own. Over a framed wall it passes heat through to the framing, so the full distance is still measured to the framing. Ask your building department before you rely on any reduced figure.
What Floor Protection Does a Corner Hearth Need?
It needs the floor protection the stove's manual specifies. The manual sets its size, how far it reaches in front of the door and to the sides, and what it is made of. The chimney's instructions do not set it; the stove's manual does.
In a corner the stove sits at an angle, so the front of the hearth runs out along the diagonal. Draw the stove's outline at its angle, mark the manual's distances from its edges and door, and shape the hearth to cover them. Carpet, vinyl plank and wood flooring under it all count as combustible.
How Do You Get the Chimney Out of a Corner?
There are two ways: straight up through the ceiling, or out through one of the two walls. Either way the stove pipe stops inside the room and never passes through a wall, ceiling or roof.
Listed Class A chimney pipe takes over at that point. It is kept at least 2 inches from combustibles, per the system's installation instructions.
| Route | What happens in the corner | What the kit includes |
|---|---|---|
| Up through the ceiling | The pipe rises to a ceiling support box, and the opening sits close to the framing of both walls | Support box, Class A pipe through the attic and roof, roof flashing and cap |
| Out through a wall | The pipe rises, turns toward one wall and meets the Class A pipe before that wall | Wall thimble, Class A pipe through the wall, a tee and supports outside |
Straight Up Through the Ceiling
The pipe goes up from the stove's collar to a ceiling support box, and Class A pipe runs through the attic and out of the roof. In a corner, check that the opening clears the ceiling joists and the top of both walls before you cut.
Our insulated chimney pipe kit through the attic picks the support box from your ceiling type, flat or sloped. It also includes the attic insulation shield and the roof exit parts. Under an open or vaulted ceiling with no attic above, our cathedral ceiling chimney kit runs straight up through the roof instead.
Out Through One of the Two Walls
The pipe rises from the stove, turns toward the wall you exit through and joins the Class A pipe before that wall. Only Class A pipe passes through the wall thimble, and a tee outside starts the chimney up the wall.
A corner adds one check. The horizontal run toward one wall runs alongside the other wall, so its clearance to that side wall applies along the whole run. On a combustible wall, single wall pipe stays 18 inches from the wall it exits through, and the change to Class A happens before that zone.
Our through the wall chimney kit works the run out from your wall type and thickness and the height you need outside.
The Top of the Chimney
On either route, the top has to meet the 3-2-10 rule in NFPA 211 and the chimney's installation instructions. Our guide on how high a chimney must stand above the roof works it out for your roof.
For a factory-built chimney such as Class A, Section R1005.1 of the International Residential Code (chapter 10, Chimneys and Fireplaces) reads: "Factory-built chimneys shall be listed and labeled and shall be installed and terminated in accordance with the manufacturer's installation instructions."
Send Us Your Corner Before You Order
Write down five things and send them to our free flue design service. You get back a matched parts list for your corner at no charge.
- The stove's corner clearances and the connector pipe its manual allows.
- The flue collar diameter, which our Class A chimney matches in 6 or 8 inch.
- The distance from the collar to each wall, and the ceiling height.
- The route: up through the ceiling, or through which wall, with its material and thickness.
- For the wall route, the height the chimney needs outside.
Every part comes from one curated line; use only the parts made for each pipe at every joint, as its installation instructions require. A capable owner can fit a standard kit, and you can talk it through with a specialist on 888-834-0880.
Fit a carbon monoxide alarm and a smoke alarm, placed as their makers' instructions say, before the first fire. If the carbon monoxide alarm sounds, get everyone outside and call 911.
Need More Information?
Our chimney and stove pipe FAQ answers clearances, flue temperatures and codes. For the spacing around a smaller stove anywhere in a room, see our guide to the space around a small wood burning stove.
Each route is set out step by step in our wood stove pipe installation guides. To go over your corner with someone, ask our flue specialists or call 888-834-0880.
