There are several types but it is ultimately to anchor the structure against natural forces including earthquakes, floods, frost heaves, tornadoes, and wind, and provide a level surface for construction.
T-Shaped, a traditional foundation method to support a structure in an area where the ground freezes. A footing is placed below the frost line and then the walls are added on top.
A slab-on-grade foundation, as the name suggests, a slab is a single layer of concrete, several inches thick. The slab is poured thicker at the edges, to form an integral footing; reinforcing rods strengthen the thickened edge.
Frost Protected, this method only works with a heated structure. It relies on the use of two sheets of rigid, polystyrene insulation-one to prevent freezing which is a problem with slab-on-grade foundations in areas with frost.
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