Concrete settles over time, which causes foundation cracks and buckling basement walls. Concrete is porous, so it absorbs water through capillary action during the winter. When the air temperature rises in the spring, the concrete releases the water vapour, which creates hydrostatic pressure on the foundation wall.
In addition to a bowed or cracked basement wall, there are other warning signs that should prompt a call to a professional for an inspection. The sooner a repair is made, the more you can save on potential expenses.