Foundation cracks can be caused by several different factors, but the most common are tree roots, poor soil, and water erosion. Water and tree roots exert pressure against your home's foundation, eventually, the pressure is too much, and this results in the cracks in your foundation. Loose soil is easily saturated and when filled with water can cause hydrostatic pressure against the foundation walls. As loose soil settles, it also results in a shift in your home’s foundation.