Evansville Tuckpointing Bowing or bulging brick wall: how to measure it and when to stop waiting
A brick wall that bows, bulges, or reads as a belly when you sight down it has moved, and movement is the one masonry symptom worth acting on this week rather than this season. Bowing means the brick is no longer working as a single wall: the outer face has separated from what is behind it, or something is pushing it. This is not a repointing job, and any bid that treats it as one is wrong. Keep people out from under it and get a real assessment.
Check this first (fifteen minutes, string and a level)
- Sight down the wall. Stand at one corner with your eye near the face and look along it. A wall that reads straight is fine. A belly, a wave, or a section that steps out is the symptom.
- String it. Run a taut string from corner to corner at chest height, held off the wall by an even block at each end. Measure the gap at the middle. A bulge of half an inch across a long wall is worth watching. An inch or more is worth stopping and calling.
- Check the mortar in the bulge. Joints inside a bulged area are often wide, open, or filled with debris. That is the wall having stretched.
- Look for the horizontal crack. A long horizontal crack at the middle of a basement wall, or one running along a bed joint upstairs, is the fold line of the bow.
- Look for header courses. On solid masonry, every sixth or seventh course of old brick often shows short ends, which are the headers tying the wythes together. If those courses are cracked, spalled, or missing, the bond is what failed.
- Do not push, load, or excavate against it. Do not park under it, and do not dig against a bowing basement wall, which removes the soil that is currently holding the whole thing in balance.
What is usually wrong
| What you are seeing | Likely cause | What the repair looks like |
|---|---|---|
| Bulge in an old solid brick wall, header courses spalled | Wythes separated, bond lost | Take down and rebuild the area with proper bonding |
| Bulge with rust staining in a line | Corroded steel ties or shelf angle | Structural repair, then masonry rebuild |
| Basement wall bowing inward with a horizontal crack | Soil and water pressure outside | Drainage plus structural repair before any repointing |
| Bulge under a leaking gutter or valley | Long-term saturation and freeze-thaw | Fix water, then rebuild the affected area |
| Wall leaning out at the top only | Roof or joist connection failing | Structural assessment first |
| Bulge plus loose brick | Bond fully gone in that area | Rebuild, salvage sound units |
| Bulge plus step cracks at openings | Movement and lintel problems together | Assess the whole elevation as one job |
For scale on the money, the published ranges nearby are on the pricing page: repointing at $8 to $20 per square foot, brick replacement at $20 to $40 per unit, and foundation repointing at $10 to $25 per square foot. A rebuilt section is quoted after a look.
Why Evansville walls separate
Water and time. Solid masonry walls in the older neighborhoods, from Riverside and Lamasco to Goosetown and Bayard Park, are two or three wythes of brick bonded by header courses, all bedded in lime mortar. Once water gets in through open joints, roughly 77 freeze-thaw cycles a winter go to work on the bond, and the mortar in the collar joint between the wythes, which nobody can see, fails long before the joints on the face look alarming. NOAA’s 1991-2020 normals for Evansville Regional Airport count 92.6 nights a year at or below 32 degrees against only 15.5 days that stay frozen, under 45.31 inches of annual rain.
Basements are the other case. Evansville’s river-bottom and terrace soils hold water, the wettest months are March at 4.60 inches, April at 5.14, and May at 5.12, and the Ohio has been above the 42-foot flood stage 41 times since 1940 by the Levee Authority’s count. Saturated soil against an old brick or rubble foundation pushes, and the wall folds at its weakest bed joint. That is why a bowed basement wall so often shows up with a wet spring.
When it is structural, not cosmetic
Always. A bow is displacement, and displacement means load is not traveling the way the wall was built to carry it. Treat it as urgent when the bulge measures an inch or more, when it has grown since you last looked, when there are loose units in it, when there is a horizontal crack through it, or when it sits over a walkway, driveway, or neighboring property. In several of these cases the right first call is a structural engineer, and a mason who says so is doing you a favor rather than losing a job.
What to expect on the call
Send the sighting photo down the wall, the string measurement with a tape in frame, close-ups of the joints and any header courses inside the bulge, and photos of the gutters and grade on that elevation. Expect the conversation to start with whether an engineer needs to look at it. Expect to hear that the affected area comes down and goes back up rather than being repointed, and that sound salvaged units get reused where the color match matters, as it does across most of the Evansville historic districts.
Frequently Asked Questions
Is a bulging brick wall dangerous?
It can be, and it is the one masonry symptom nobody should sit on. A bulge means the brick is no longer acting as one wall: either the outer wythe has separated from what is behind it or the wall is being pushed. Brick that has lost its bond can come down in a section, so keep people and cars away from below it and get eyes on it.
What causes a brick wall to bow out?
In older solid masonry, the header courses or ties that bond the outer wythe to the inner one have corroded or the mortar holding them has failed, so the face is standing on its own. In basements it is soil pressure pushing in. In veneer walls it is corroded wall ties. Water is behind all three.
Can a bowing wall be repointed instead of rebuilt?
Repointing a wall that has already moved does not put it back. The usual repair is taking the affected area down and rebuilding it in place, resetting salvaged units where they are sound, with proper ties. Repointing has a role afterward, on the sound masonry around the rebuilt area.
How much does this cost in Evansville?
There is no honest per-foot number for a moved wall, because the scope depends on how far it has gone and what is behind it. For scale, the published ranges nearby are $8 to $20 per square foot for repointing, $20 to $40 per brick for replacement, and $10 to $25 per square foot for foundation wall repointing. A rebuilt section is quoted after an on-site look, and an engineer may need to see it first.