What Are Stairstep Cracks and How Do They Affect My Foundation?
Noticed a zig-zag crack running through your brick or block foundation wall? That pattern isn’t random—it’s called a stairstep crack, and it’s one of the most common signs of foundation settlement.
At DESKA, we frequently receive calls from homeowners across Alexandria and Northern Virginia inquiring about the seriousness of these cracks. The short answer? Yes—especially if they’re getting worse over time.
In this article, we’ll break down what stair-step cracks are, what causes them, how they affect your home, and when it’s time to take action.
What Are Stairstep Cracks?
Stairstep cracks are diagonal, jagged cracks that follow the mortar joints between bricks or concrete blocks. Instead of cutting straight across, they move up or down in a zig-zag or “step-like” pattern—hence the name.
You’ll typically see them on the exterior or interior foundation walls, especially near corners or windows.
What Causes Stairstep Cracks?
Stairstep cracks are most commonly caused by uneven foundation settlement. This happens when the soil beneath part of your foundation shifts, compresses, or washes away—causing one side of the house to sink or tilt slightly.
Common contributing factors include:
- Expansive clay soils that shrink and swell with moisture changes
- Poor drainage or water pooling near the foundation
- Tree roots drawing moisture from the soil
- Improper grading or backfill during construction
As the foundation shifts, the rigid masonry walls crack under pressure—often in a stairstep pattern.
Why Stairstep Cracks Are a Problem
While hairline cracks in foundation walls are often harmless, stairstep cracks are rarely cosmetic. They indicate structural movement and can lead to:
- Water intrusion through gaps in the masonry
- Worsening settlement, leading to more cracks or tilting
- Compromised structural integrity
- Decreased property value and potential issues with home inspections or resale
If you notice that your cracks are growing, spreading, or appear on multiple walls—it’s time to act.
DESKA Offers Proven Foundation Settlement Repair
If your home is showing signs of settlement—including stairstep cracks, sloping floors, or sticking doors—DESKA provides professional foundation settlement repair throughout Alexandria and Northern Virginia.
Our services include:
- Helical and push pier systems to lift and stabilize your foundation
- Crack repair and wall reinforcement
- Drainage and grading improvements to prevent future issues
- Comprehensive evaluations with detailed repair plans
Concerned About Stairstep Cracks? We Can Help.
Don’t ignore the warning signs. Stairstep cracks can quickly lead to bigger—and more expensive—problems. If you’re unsure whether your cracks are a real concern, let DESKA take a look. We’ll inspect your foundation, explain the cause, and recommend the right solution to keep your home safe and secure for years to come.
Call our team at 703-665-1456 or click the button below to schedule a free estimate.