Worry about a crack when it is wide, offset, horizontal, or growing. A hairline crack in drywall or a fine crack in mortar with the two sides still lined up is usually cosmetic. A stair-step crack in brick that widens toward the top, a crack where one side has shifted relative to the other, a horizontal crack in a wall or grade beam, or any crack that has visibly grown in the last year, those point to foundation movement and should be surveyed.
The four things to look at
Width. Cosmetic cracks are typically under an eighth of an inch. Cracks over about a quarter inch in brick or slab deserve attention. Width alone is not decisive, but it is the first screen.
Direction. Vertical and diagonal cracks are common and often shrinkage or minor settlement. Horizontal cracks in a wall or stem wall indicate lateral pressure, often from expanding clay, and are more serious.
Displacement. Put a straightedge across the crack. If the two faces are flush, it is more likely cosmetic. If one side has moved in, out, or up relative to the other, the foundation is moving.
Progression. A crack that opens in a dry summer and closes after the rains, without net growth year over year, is the visible sign of Abilene’s normal clay cycle. A crack that only ever widens is active settlement or heave.
Common Abilene crack patterns and what they mean
| What you see | Likely meaning |
|---|---|
| Stair-step crack in exterior brick near a corner, widening upward | Edge settlement at that corner |
| Diagonal crack from a door or window corner, inside | Wall riding down with a settling edge, or drying shrinkage |
| Horizontal crack along a grade beam or stem wall | Lateral pressure from swelling clay |
| Crack across an interior slab, with doors binding at the bottom | Center heave |
| Fine cracks in mortar joints, no offset, stable | Usually cosmetic |
What to do now
- Photograph each crack with a coin or ruler for scale, and date the photo.
- Note where and when you first saw it, and whether it tracks the seasons.
- Do not fill anything but a stable hairline crack.
- Get a free foundation inspection with a manometer survey. If the movement is seasonal, you get a baseline and a drainage plan. If it is active, you get a scope before it grows.
Bottom line
Cosmetic: thin, aligned, stable. Structural: wide, offset, horizontal, or growing. When in doubt, a manometer survey answers it, and a few months of monitoring can tell a seasonal crack from a progressive one before you spend on piers. Call (325) 399-3448.
Quick answers
Is a crack in my brick always a foundation problem?
No. Fine cracks in mortar joints with no offset, short vertical cracks over windows, and hairline drywall cracks in a newer home are often cosmetic. The cracks that signal foundation movement are stair-step cracks that widen toward the top, cracks where the two faces are offset, and horizontal cracks in a wall or grade beam.
How wide does a foundation crack have to be to be serious?
As a rough guide, brick or slab cracks over about a quarter inch, any crack with the two sides no longer aligned, and any horizontal crack warrant a survey. But direction and whether it is still growing matter as much as width. A thin crack that is offset and opening is more concerning than a wider crack that has been stable for years.
Should I fill the cracks while I wait to get it checked?
Seal a cosmetic hairline crack to keep water out if you want. Do not fill anything wider, offset, or growing, the technician needs to see and measure it to diagnose the movement. Sealing it first removes the evidence.
Talk to someone about your foundation. A free on-site manometer survey gives you real numbers for your home.
Call (325) 399-3448