Differential Settlement - Then, there are other times when a floor tile crack may be a symptom of a much larger, structural related issue. If a floor tile crack is observed with crown molding separations, cabinet separations, and/or wall and ceiling cracks, then the floor tile crack may be associated with differential settlement in your foundation. Differential settlement happens when areas of the soil supporting your foundation consolidate (squeeze together) or move at different rates than adjacent areas beneath the foundation. This condition creates stress in the foundation, usually in the form of cracks in the slab and uneven floor elevations. If floor tiles are installed on the slab, the tiles will likely crack. Repair methodologies for differential settlement vary from region to region. If you suspect differential settlement has created a floor tile crack in your house, consultation with a structural engineer is highly recommended. Diagnosing the reason floor tile cracks have occurred in your house takes a seasoned professional who understands the complexities of houses and the physical forces that may be applied to your house. Understanding and diagnosing the reason for a floor tile crack in your house is not typically within the ability of homeowners.