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<br /> <br />Chapter VI: General Design Practices <br />Elevation <br /> <br />HOUSES ON PILES, PIERS, OR <br />COLUMNS <br /> <br />The process of elevating a house on piles, piers, or columns <br />is slightly more complex in that temporary relocation of the <br />house may be part of the elevation process, With the use of <br />this type of foundation, the house may need to be lifted off <br />the existing foundation and temporarily relocated on-site. <br />The existing foundation is then removed and/or recon- <br />structed, and the house is reset on the new foundation. <br />However, raising the home above the working area may <br />provide sufficient room to auger pier and column founda- <br />tions and to jet pile foundations. <br /> <br />SLAB-ON-GRADE HOUSES <br /> <br />These houses are the most difficult to raise in that if the slab <br />is to be raised with the house, a trench must normally be <br />dug under the house to provide a space for inserting lifting <br />beams. However, intrusive techniques that place beams <br />through the structural walls have proved to be successful in <br />elevating slab-on-grade homes, as well, If the existing slab is <br />to remain in place, then the house must be detached from <br />the slab, the structure raised separately from the slab, and a <br />new floor system built, along with an elevated foundation. <br /> <br />While slab-on-grade houses may be the most difficult to <br />raise, a number of elevation options exist with regard to <br />raising the structure with or without the slab and using a <br />first floor composed of wood or concrete, The various <br />alternatives include: <br /> <br />VI - E.16 <br /> <br />Engineering Principles and Practices of Retrofitting Flood-Prone Residential Structures <br />January 1995 <br />