Foundation Tilt, Tilting - A foundation that is no longer level, but retains its flatness, is said to have tilted. A tilted foundation does not always cause cracks in walls. Cracks in walls are caused by angular distortion or bending of the foundation. The Texas Residential Construction Commission (TRCC) defines unacceptable tilt as: The slab shall not deflect after construction in a tilting mode in excess of one percent from the original construction elevations resulting in actual observable physical damage to the components of the home. In plain English, TRCC allows a maximum of 1 percent tilt in an 80 foot span. That is a whopping 9 inches. Even 4-6 inches of foundation tilt in an 80 foot span is unacceptable to the average homeowner. Remedial repair for foundation tilt is underpinning a majority of the foundation.