Three reasons for cracks in a concrete slab foundation:
- Stress at an outside corner can cause a wedge shaped corner to crack. This is not a problem.
- Surface cracks may have occurred as the cement was curing. This is not a problem.
- The crack could be indicative of a foundation problem. You will need to call a foundation repair company such as Granite for a foundation evaluation. Such inspections are usually free to the property owner when performed by a foundation repair company.