Key takeaways
- Hairline vertical cracks are common and often cosmetic
- Stair-step cracks follow the mortar joints and can mean movement
- Horizontal cracks and bowing in a basement wall are a warning
- Mark a crack and watch it over time
Cracks are the way masonry tells you something is moving.
Hairline and vertical
Narrow vertical cracks often come from shrinkage or temperature change. They are usually cosmetic.
Stair-step
Cracks that step up through the mortar joints suggest settlement or a failed lintel, especially at the corners of windows and doors.
Horizontal and bowing
In a foundation or retaining wall, a horizontal crack or a bulge means pressure is pushing on the wall. Do not ignore it.
Watch it
Mark the ends of a crack with a pencil and the date. If it grows, call for a closer look.
Related services
Questions about your own masonry? Call or text 800-224-9245, or use the estimate form below.