Most poured concrete foundations (and some concrete block foundations) have cracks.
In most cases, these cracks are vertical or diagonal shrinkage cracks that are less than an eighth of an inch wide.
Any crack, large or small, should be monitored for further movement and/or water infiltration into the home and, if necessary, professionally remedied.
Bowing or Leaning
Bowing, leaning or horizontal cracking of a foundation wall is usually a more significant structural problem caused by lateral forces being exerted on the foundation, such as:
- Excess moisture in the soil (most common with soil types such as clay, which expand significantly when water is introduced but can occur with any soil type)
- Tree roots adjacent to the foundation
Premature back filling (when the foundation is not yet “set”), or back filling with large rocks.