Are stair-step cracks in brick always a foundation problem?
No. Small, stable cracks can come from normal shrinkage or minor seasonal movement. Growing, uneven, or displaced cracks are more likely to reflect foundation movement.
Are Stair-Step Cracks Serious in Houston Homes?
Stair-step cracks zigzag through mortar joints in brick. Some are old and harmless. Others are the clearest outside sign that part of a foundation is moving.
Educational guide. General information for Pearland and Southeast Houston homeowners, not a repair quote, engineering opinion, or insurance advice.
What a stair-step crack is
Brick veneer is laid in rows, so when the wall below it moves, the weakest path is usually through the mortar joints. The crack steps up and over from brick to brick in a staircase pattern. You most often see it near corners, under windows, and above garage doors.
Why they are common in the Houston area
Most Houston-area homes sit on expansive clay. When the soil under one corner dries and shrinks while the rest stays moist, that corner of the slab drops slightly. Brick is stiff and cannot flex, so it cracks. Heavy rain can then push the same area back up, which is why some cracks open in late summer and partly close in fall.
When a stair-step crack is probably minor
- It is hairline (thinner than a credit card) and the same width along its length.
- It has not changed in months, and old paint or dirt sits inside it.
- There are no matching signs inside, such as sticking doors or drywall cracks in the same area.
When to have it inspected
- It is wider at the top or bottom than in the middle, which suggests rotation.
- You can fit a coin in it, or the brick has shifted out of line on one side.
- It keeps growing or reopens after being patched.
- Doors, windows, or drywall near the same corner are also showing problems.
- You see a crack in the slab edge (grade beam) below the same spot.
How to track a crack yourself
- Photograph it with a ruler or coin for scale and note the date.
- Mark each end with a pencil line and date.
- Check again after a few weeks and after major weather changes.
- Walk inside the same corner and check doors, windows, and drywall.
Should you just repoint the mortar?
Repointing closes the gap and keeps water out, but it does not fix movement. If the foundation is still moving, the crack will reopen. Get an elevation survey first, then decide on slab repair, drainage correction, or cosmetic work.
Homeowners in Pearland, Friendswood, and Pasadena see these cracks often on older brick homes.
Frequently asked questions
How wide is too wide for a brick crack?
There is no single number, but cracks you can fit a coin into, cracks that are wider at one end, or bricks that have shifted out of line deserve an inspection.
Can I fix a stair-step crack myself?
You can repoint mortar to keep water out, but if the foundation is still moving, the crack will come back. Find out whether it is active first.
Keep reading
All foundation guides · Foundation repair services · Repair cost guide · Foundation inspections · Foundation repair in Pearland
Next step: Request an inspection or call (346) 679-7687. Foundation First TX is an independent inspection-request site, not the contractor of record.
Stair-step crack getting wider?
Request an inspection with an elevation survey to see whether the foundation is moving.