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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. The footing is wider than the wall, providing extra support at the base of the
foundation. A T-
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. The slab normally rests on a bed of crushed gravel to improve drainage. Casting a wire mesh in the concrete reduces the chance of cracking. A slab on grade is suitable in areas where the ground doesn't freeze, but it can also be adapted with insulation to prevent it from being affected by the frost heaves.
This method only works with a heated structure. It relies on the use of two sheets
of rigid, polystyrene insulation—one on the outside of the foundation wall and the
other laid flat on a bed of gravel at the base of the wall—to prevent freezing, which
is a problem with slab-