Transpiration
Tree roots could desiccate the soil beneath a home causing soil shrinkiage and settlement of the home.

Plumbing Leaks
Water from leaky plumbing is often a major contributor to foundation problems.

Drainage
Improper drainage will lead to excess moisture build up, which could erode or consolidate soils and causing settlements.
 

Poor Foundation Construction
Insufficient steel reinforcements in concrete could contribute to movement in foundations.

Poor Ground Preparation
Cut and fill situations should be properly prepared before structure is started or it may result in improperly compacted soil beneath the foundation.

Poor Soil Conditions
Poor soil and its expansion and/or contraction contribute to foundation failures