Tuckpointing a Chimney in Chicago: When Is It Enough?

Tuckpointing a chimney is the right repair when the problem is the mortar and only the mortar. It is the wrong repair when the chimney is leaning, the brick is coming apart, or the water is getting in from the top. The skill is in telling those cases apart before anyone builds scaffolding, because a chimney is the most exposed masonry on your building and the most expensive to redo.

When is tuckpointing a chimney enough?

Tuckpointing is enough when all of this is true:

• The brick faces are intact. They may be dirty or stained, but they are not flaking, peeling or crumbling.
• The mortar joints are the visible problem: sandy, cracked, recessed or missing in places.
• The chimney stands straight. No lean, no gap opening between the chimney and the wall of the building.
• No course of brick has shifted or slid, and no bricks are loose in the stack.
• The cap at the top and the flashing at the roofline are not the source of the leak.

If that describes your chimney, repointing is what the Brick Industry Association means by renewing the joints: grind out the failed mortar and replace it (BIA). It restores the weather seal and puts load back through the joints the way the wall was built.

What tuckpointing does not fix on a chimney

Plenty of chimney problems look like a mortar problem from the ground. Tuckpointing alone will not solve these:

• A leaning or separating chimney. That is a structure problem, often at the base or the footing. Read leaning chimney: is it about to fall before you spend anything on joints.
• Spalling brick faces. When the face of the brick pops off, the damage is in the brick. Salts crystallizing inside the brick, or saturated brick freezing, can make the surface spall or delaminate (BIA/NPS guidance). Grinding and repointing around bad brick buys little. Some of the brick usually has to be replaced.
• A failed top. A chimney is a tall wall with its top open to the sky. The cap sheds water, and a cap with many mortar joints can be a poor choice compared with concrete, stone or metal because it sits at the most exposed location (BIA). Our chimney crown repair article explains why water gets in at the top.
• Missing or failed flashing. Where the chimney meets the roof, flashing is the layer that directs water back out, and it belongs at chimneys among other places (BIA). Repointing does nothing for flashing.
• The inside of the flue. Mortar joints on the outside tell you nothing about the liner inside. That is a separate inspection by a different trade.

When it is more than joints, you are into chimney repair or rebuild decisions. A good mason will tell you which side of that line you are on, and why, before quoting.

How do you tell from the ground?

You can learn a lot without climbing anything. Use binoculars from the yard or the alley.

1. Look at the brick faces first, not the mortar. Flaking, orange or powdery faces point away from a joints-only job.
2. Check the lean. Line the chimney up against a vertical edge such as the corner of the building or a door frame. Any visible gap at the roofline, or daylight between chimney and wall, is a call-a-pro moment.
3. Look for grit. Sandy debris on the roof, in the gutter or on the ground below means mortar is shedding. Bricks or chunks mean more than that.
4. Check inside. Brown stains or damp plaster on the wall around the chimney, especially after hard rain, can mean water is getting in through the chimney or flashing.
5. Do not climb a roof to inspect. The chimney is the part you should never test with a screwdriver. A loose course can come down on you.

If you see a white powder on the brick, that is likely efflorescence, a salt deposit that points to a moisture problem to fix, not a cleaning job (BIA).

Do you need a permit to tuckpoint a chimney?

The City of Chicago lists "routine maintenance and repair for masonry walls, such as tuckpointing" as eligible work in its Express Permit masonry category, and masonry permits require a licensed mason contractor unless an owner qualifies as owner-contractor. A chimney is masonry, so treat chimney tuckpointing as permit work. Because the rules and what counts as a chimney repair can change, check with the Department of Buildings if your job is unusual. We walk through the whole permit picture in do you need a permit for tuckpointing in Chicago.

If scaffolding, a lift or a dumpster will sit on the sidewalk, street or alley, that needs its own public way permit from the Chicago Department of Transportation (City of Chicago).

What does tuckpointing a chimney cost?

We do not quote numbers in an article because chimneys vary too much. What moves the price:

• Height and access. A short chimney reachable from a roof is not the same as a tall one that needs scaffolding or a lift.
• How much mortar has failed. A few joints versus the whole stack.
• Brick condition. Replacing bricks is added work, and so is rebuilding the top courses.
• The cap and flashing. If those need work, they are part of the bid.
• Street or alley staging. The public way permit and the setup it requires.
• Mortar match and dust control. Mortar has to be softer than the brick (NPS), and grinding mortar means silica dust controls (OSHA).

For the wider picture, see what moves the price of tuckpointing in Chicago.

Why is it worth doing before something falls?

Because the City holds you to it. Chicago's code says the exterior of a structure must be kept in good repair and structurally sound, and lists masonry joints that are not weather resistant or water tight as an unsafe condition (City of Chicago). The City's high-rise facade program does not reach a typical two-flat, but an inspector can still cite loose masonry after a 311 complaint. A chimney shedding bricks onto a gangway is the kind of complaint that brings one.

One more thing owners should know. Illinois' Home Repair and Remodeling Act covers one to six unit residences, lists chimneys among its examples, and says that for work over $1,000 the contractor must give you a written contract stating the total cost (State of Illinois, scope). Ask for it.

If your chimney is showing mortar loss and you are not sure whether it needs joints or a rebuild, our tuckpointing team will look at it, say which, and put the scope in writing. For the full picture on repointing, start with the Chicago tuckpointing guide.

Common questions

This article explains general rules and common situations in Chicago. It is not legal advice, and City rules change. For a specific property, check with the Chicago Department of Buildings or a licensed professional.