Tuckpointing vs. Repointing vs. Rebuilding

 Around St. Louis, "tuckpointing" gets used for just about any mortar repair. Masons say it, homeowners say it, and most of the time everyone knows what they mean. But when you're trying to figure out what your house actually needs — and what someone should be quoting you for — the differences matter

 Here's the plain-English version. 

 The short version: if your mortar is crumbling but the bricks are solid, you need repointing — which is what most people here call tuckpointing. If the bricks themselves are cracked or flaking, or the wall is shifting, the problem goes past mortar and part of the wall may need rebuilding. The joints tell you most of the story. 

 Repointing is the repair almost everyone is actually asking about. The old, failing mortar gets ground or raked out of the joints to a proper depth, then fresh mortar gets packed in and tooled to match the original profile. Done right, it seals the wall back up against water and can add decades of life.

The part that separates good work from bad: the new mortar has to match the old in hardness, not just color. 

Stuff a soft old wall with modern high-strength mortar and the bricks take the stress instead of the joints — which is how repairs end up causing damage. 

 True tuckpointing is an older decorative technique. The mason fills the joints with mortar tinted to match the brick, then lays a thin line of contrasting mortar down the center to make the joints look razor-straight and fine. You'll spot it on some of the older homes in neighborhoods like Lafayette Square and Soulard. 

In everyday St. Louis usage, though, "tuckpointing" just means repointing, and that's how we use it too. Nobody's going to correct you on a job site. What matters is that you and your mason agree on the actual work being done. 

  Sometimes mortar isn't the problem — the wall is. Bricks that are cracked through, spalling (the faces popping off), or a section that's bowing, bulging, or leaning means there's movement or moisture damage behind the surface.

Repointing over that is like painting over rot. 

In those cases, the damaged section gets taken down and relaid, often reusing the original brick where it's still sound. It's a bigger job, but it's the honest fix. A wall that's moving will crack fresh mortar within a couple of seasons, and then you've paid twice.

   You don't need a trowel to do a basic check. 

Walk the house and look at three things. 

  Run a key along a mortar joint. If it scratches out sandy material easily, or the joints have visibly receded back from the brick face, the mortar is failing. That's repointing territory — caught early, it's the most routine repair in masonry.  

 Solid bricks with bad joints is good news. Bricks with cracks running through them, or faces flaking away, point to water or stress problems that mortar alone won't solve.