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Soils movements are caused by: 1] the shrinking and swelling of expansive soils as they dry and get wet 2] by the settlement of fill dirt that has not been fully compacted 3] and the heaving of soils where the land has been cut. As the underlying soils move, slabs will move up and down and may tilt (uniform deflection) or bend (differential deflection). As a result, expectations for the performance of an existing slab should take into account the age, and hence the then current design criteria, of the slab.įoundation slabs are not completely rigid or perfectly stationary. In general, older slabs tend to be thinner and have less steel reinforcing than newer slabs. Over time, design criteria have changed to incorporate the experiences of the engineering and building communities. Slab on grade foundations are built of concrete reinforced with steel. For other types of individuals, such as foundation repair contractors, insurance companies, builders, Realtors, property sellers, property buyers, and lawyers the answer will be affected by their personal experiences and vested interest in a particular situation. Within the engineering community, the answer will vary depending on each engineer’s opinions as to the appropriate design assumptions, design procedure, applicable building codes, legal precedents, and market standards. This will receive a variety of answers depending on who they ask.
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With respect to slopes (foundation deflections) in slab on grade foundations, individuals who ask… Yard Drainage Solutions for Slab Foundation Repair