Not all foundation cracks are equal. Learn to tell the difference between harmless shrinkage cracks and serious structural warning signs that require immediate attention.
Foundation cracks are one of the most common concerns for homeowners — and one of the most misunderstood. The key question is: is this crack telling you something serious, or is it just normal concrete behavior?
Types of Foundation Cracks
Hairline cracks (under 1/16") — These are typically shrinkage cracks that form as concrete cures. They are common in new construction and generally harmless. Monitor them over time; if they grow, get an inspection.
Vertical cracks — Vertical cracks up to 1/4" wide are usually caused by settlement or concrete curing. They often allow water intrusion but are rarely structural emergencies. They can be repaired with epoxy injection.
Diagonal cracks — Diagonal cracks, especially stair-step cracks in brick or block foundations, indicate differential settlement. One side of the foundation is dropping faster than the other. These require professional evaluation.
Horizontal cracks — The most serious type. Horizontal cracks in basement or retaining walls indicate soil pressure is pushing the wall inward. This is a structural emergency requiring immediate attention.
When to Call a Professional
Call PiersPro immediately if:
- The crack is wider than 1/4 inch
- The crack is horizontal
- The crack is actively growing (mark the ends with pencil and date to monitor)
- There is water seeping through the crack
- Doors and windows near the crack suddenly stick or won't close
- You can see daylight through the crack
What We Do
At PiersPro, we start with a free visual inspection to assess crack severity and root cause. We then recommend the appropriate repair — from simple epoxy injection to full underpinning with helical piers. We never recommend more than is needed.